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https://github.com/freebsd/freebsd-src
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Man pages for the openat(2), fexecve(2) and related syscalls.
Reviewed by: ru
This commit is contained in:
Konstantin Belousov
parent
eab626f110
commit
a141af6930
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=178245
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@ -28,11 +28,13 @@
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.\" @(#)access.2 8.2 (Berkeley) 4/1/94
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.\" $FreeBSD$
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.\"
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.Dd February 11, 2008
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.Dd April 10, 2008
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.Dt ACCESS 2
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.Os
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.Sh NAME
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.Nm access , eaccess
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.Nm access ,
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.Nm eaccess ,
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.Nm faccessat
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.Nd check accessibility of a file
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.Sh LIBRARY
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.Lb libc
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@ -42,6 +44,8 @@
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.Fn access "const char *path" "int mode"
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.Ft int
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.Fn eaccess "const char *path" "int mode"
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.Ft int
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.Fn faccessat "int fd" "const char *path" "int mode" "int flag"
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.Sh DESCRIPTION
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The
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.Fn access
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@ -86,6 +90,38 @@ the real user ID in place of the effective user ID,
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the real group ID in place of the effective group ID,
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and the rest of the group access list.
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.Pp
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The
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.Fn faccessat
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system call is equivalent to
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.Fn access
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except in the case where
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.Fa path
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specifies a relative path.
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In this case the file whose accessibility is to be determined is
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located relative to the directory associated with the file descriptor
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.Fa fd
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instead of the current working directory.
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If
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.Fn faccessat
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is passed the special value
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.Dv AT_FDCWD
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in the
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.Fa fd
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parameter, the current working directory is used and the behavior is
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identical to a call to
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.Fn access .
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Values for
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.Fa flag
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are constructed by a bitwise-inclusive OR of flags from the following
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list, defined in
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.In fcntl.h :
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.Bl -tag -width indent
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.It Dv AT_EACCESS
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The checks for accessibility are performed using the effective user and group
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IDs instead of the real user and group ID as required in a call to
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.Fn access .
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.El
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.Pp
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Even if a process's real or effective user has appropriate privileges
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and indicates success for
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.Dv X_OK ,
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@ -125,6 +161,33 @@ points outside the process's allocated address space.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to the file system.
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.El
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.Pp
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Also, the
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.Fn faccessat
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system call may fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa path
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argument does not specify an absolute path and the
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.Fa fd
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argument is
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neither
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.Dv AT_FDCWD
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nor a valid file descriptor.
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.It Bq Er EINVAL
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The value of the
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.Fa flag
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argument is not valid.
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.It Bq Er ENOTDIR
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The
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.Fa path
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argument is not an absolute path and
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.Fa fd
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is neither
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.Dv AT_FDCWD
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nor a file descriptor associated with a directory.
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.El
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.Sh SECURITY CONSIDERATIONS
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The
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.Fn access
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@ -158,8 +221,15 @@ The
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.Fn access
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system call is expected to conform to
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.St -p1003.1-90 .
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The
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.Fn faccessat
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system call follows The Open Group Extended API Set 2 specification.
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.Sh HISTORY
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The
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.Fn access
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function appeared in
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.At v7 .
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The
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.Fn faccessat
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system call appeared in
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.Fx 8.0 .
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|
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@ -28,13 +28,14 @@
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.\" @(#)chmod.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd January 16, 2006
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.Dd April 10, 2008
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.Dt CHMOD 2
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.Os
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.Sh NAME
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.Nm chmod ,
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.Nm fchmod ,
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.Nm lchmod
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.Nm lchmod ,
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.Nm fchmodat
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.Nd change mode of file
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.Sh LIBRARY
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.Lb libc
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@ -46,6 +47,8 @@
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.Fn fchmod "int fd" "mode_t mode"
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.Ft int
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.Fn lchmod "const char *path" "mode_t mode"
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.Ft int
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.Fn fchmodat "int fd" "const char *path" "mode_t mode" "int flag"
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.Sh DESCRIPTION
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The file permission bits of the file named specified by
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.Fa path
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@ -73,6 +76,45 @@ system call is similar to
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.Fn chmod
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but does not follow symbolic links.
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.Pp
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The
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.Fn fchmodat
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is equivalent to either
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.Fn chmod
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or
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.Fn lchmod
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depending on the
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.Fa flag
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except in the case where
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.Fa path
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specifies a relative path.
|
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In this case the file to be changed is determined relative to the directory
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associated with the file descriptor
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.Fa fd
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instead of the current working directory.
|
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The values for the
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.Fa flag
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are constructed by a bitwise-inclusive OR of flags from the following list, defined
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in
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.In fcntl.h :
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.Bl -tag -width indent
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.It Dv AT_SYMLINK_NOFOLLOW
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If
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.Fa path
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names a symbolic link, then the mode of the symbolic link is changed.
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.El
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.Pp
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If
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.Fn fchmodat
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is passed the special value
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.Dv AT_FDCWD
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in the
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.Fa fd
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parameter, the current working directory is used.
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If also
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.Fa flag
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is zero, the behavior is identical to a call to
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.Fn chmod .
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.Pp
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A mode is created from
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.Em or'd
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permission bit masks
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@ -213,6 +255,34 @@ The file resides on a read-only file system.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to the file system.
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.El
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.Pp
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In addition to the
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.Fn chmod
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errors,
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.Fn fchmodat
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fails if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa path
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argument does not specify an absolute path and the
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.Fa fd
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argument is neither
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.Fa AT_FDCWD
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nor a valid file descriptor open for searching.
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.It Bq Er EINVAL
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The value of the
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.Fa flag
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argument is not valid.
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.It Bq Er ENOTDIR
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The
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.Fa path
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argument is not an absolute path and
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.Fa fd
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is neither
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.Dv AT_FDCWD
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nor a file descriptor associated with a directory.
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.El
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.Sh SEE ALSO
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.Xr chmod 1 ,
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.Xr chflags 2 ,
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@ -229,6 +299,9 @@ except for the return of
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.Er EFTYPE
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and the use of
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.Dv S_ISTXT .
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The
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.Fn fchmodat
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system call follows The Open Group Extended API Set 2 specification.
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.Sh HISTORY
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The
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.Fn chmod
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|
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@ -242,3 +315,7 @@ The
|
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.Fn lchmod
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system call appeared in
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.Fx 3.0 .
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The
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.Fn fchmodat
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system call appeared in
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.Fx 8.0 .
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|
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@ -28,13 +28,14 @@
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.\" @(#)chown.2 8.4 (Berkeley) 4/19/94
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.\" $FreeBSD$
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.\"
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.Dd December 9, 2006
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.Dd April 10, 2008
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.Dt CHOWN 2
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.Os
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.Sh NAME
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.Nm chown ,
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.Nm fchown ,
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.Nm lchown
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.Nm lchown ,
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.Nm fchownat
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.Nd change owner and group of a file
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.Sh LIBRARY
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.Lb libc
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@ -46,6 +47,8 @@
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.Fn fchown "int fd" "uid_t owner" "gid_t group"
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.Ft int
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.Fn lchown "const char *path" "uid_t owner" "gid_t group"
|
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.Ft int
|
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.Fn fchownat "int fd" "const char *path" "uid_t owner" "gid_t group" "int flag"
|
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.Sh DESCRIPTION
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The owner ID and group ID of the file
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named by
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|
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@ -91,6 +94,49 @@ system call is similar to
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.Fn chown
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but does not follow symbolic links.
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.Pp
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The
|
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.Fn fchownat
|
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system call is equivalent to the
|
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.Fn chown
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and
|
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.Fn lchown
|
||||
except in the case where
|
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.Fa path
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specifies a relative path.
|
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In this case the file to be changed is determined relative to the directory
|
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associated with the file descriptor
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.Fa fd
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instead of the current working directory.
|
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.Pp
|
||||
Values for
|
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.Fa flag
|
||||
are constructed by a bitwise-inclusive OR of flags from the following
|
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list, defined in
|
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.In fcntl.h :
|
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.Bl -tag -width indent
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.It Dv AT_SYMLINK_NOFOLLOW
|
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If
|
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.Fa path
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names a symbolic link, ownership of the symbolic link is changed.
|
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.El
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.Pp
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If
|
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.Fn fchownat
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is passed the special value
|
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.Dv AT_FDCWD
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in the
|
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.Fa fd
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parameter, the current working directory is used and the behavior is identical
|
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to a call to
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.Fn chown
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or
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.Fn lchown
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respectively, depending on whether or not the
|
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.Dv AT_SYMLINK_NOFOLLOW
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bit is set in the
|
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.Fa flag
|
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argument.
|
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.Pp
|
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One of the owner or group id's
|
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may be left unchanged by specifying it as -1.
|
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.Sh RETURN VALUES
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|
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@ -152,6 +198,36 @@ The named file resides on a read-only file system.
|
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.It Bq Er EIO
|
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An I/O error occurred while reading from or writing to the file system.
|
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.El
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.Pp
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In addition to the errors specified for
|
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.Fn chown
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and
|
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.Fn lchown ,
|
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the
|
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.Fn fchownat
|
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system call may fail if:
|
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.Bl -tag -width Er
|
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.It Bq Er EBADF
|
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The
|
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.Fa path
|
||||
argument does not specify an absolute path and the
|
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.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
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.It Bq Er EINVAL
|
||||
The value of the
|
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.Fa flag
|
||||
argument is not valid.
|
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.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
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.Sh SEE ALSO
|
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.Xr chgrp 1 ,
|
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.Xr chflags 2 ,
|
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|
|
@ -163,6 +239,9 @@ The
|
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.Fn chown
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system call is expected to conform to
|
||||
.St -p1003.1-90 .
|
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The
|
||||
.Fn fchownat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn chown
|
||||
|
|
@ -182,3 +261,8 @@ The
|
|||
system call was added in
|
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.Fx 3.0
|
||||
to compensate for the loss of functionality.
|
||||
.Pp
|
||||
The
|
||||
.Fn fchownat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
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|||
|
|
@ -28,11 +28,12 @@
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.\" @(#)execve.2 8.5 (Berkeley) 6/1/94
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd June 1, 1994
|
||||
.Dd April 10, 2008
|
||||
.Dt EXECVE 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm execve
|
||||
.Nm execve ,
|
||||
.Nm fexecve
|
||||
.Nd execute a file
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,8 @@
|
|||
.In unistd.h
|
||||
.Ft int
|
||||
.Fn execve "const char *path" "char *const argv[]" "char *const envp[]"
|
||||
.Ft int
|
||||
.Fn fexecve "int fd" "char *const argv[]" "char *const envp[]"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn execve
|
||||
|
|
@ -50,6 +53,15 @@ whose name is pointed to by
|
|||
.Fa path ,
|
||||
called the
|
||||
.Em new process file .
|
||||
The
|
||||
.Fn fexecve
|
||||
system call is equivalent to
|
||||
.Fn execve
|
||||
except that the file to be executed is determined by the file
|
||||
descriptor
|
||||
.Fa fd
|
||||
instead of a
|
||||
.Fa path .
|
||||
This file is either an executable object file,
|
||||
or a file of data for an interpreter.
|
||||
An executable object file consists of an identifying header,
|
||||
|
|
@ -199,6 +211,29 @@ and
|
|||
.Fa argv
|
||||
points to the array of character pointers
|
||||
to the arguments themselves.
|
||||
.Pp
|
||||
The
|
||||
.Fn fexecve
|
||||
ignores the file offset of
|
||||
.Fa fd .
|
||||
Since execute permission is checked by
|
||||
.Fn fexecve ,
|
||||
the file descriptor
|
||||
.Fa fd
|
||||
need not have been
|
||||
opened with the
|
||||
.Dv O_EXEC
|
||||
flag.
|
||||
However, if the file to be executed denies read and write
|
||||
permission for the process preparing to do the exec, the only way to
|
||||
provide the
|
||||
.Fa fd
|
||||
to
|
||||
.Fn fexecve
|
||||
is to use the
|
||||
.Dv O_EXEC
|
||||
flag when opening
|
||||
.Fa fd .
|
||||
.Sh RETURN VALUES
|
||||
As the
|
||||
.Fn execve
|
||||
|
|
@ -269,6 +304,16 @@ to an illegal address.
|
|||
.It Bq Er EIO
|
||||
An I/O error occurred while reading from the file system.
|
||||
.El
|
||||
.Pp
|
||||
In addition, the
|
||||
.Fn fexecve
|
||||
will fail and return to the calling process if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa fd
|
||||
argument is not a valid file descriptor open for executing.
|
||||
.El
|
||||
.Sh CAVEAT
|
||||
If a program is
|
||||
.Em setuid
|
||||
|
|
@ -281,6 +326,7 @@ of a super-user as well.
|
|||
.Xr ktrace 1 ,
|
||||
.Xr _exit 2 ,
|
||||
.Xr fork 2 ,
|
||||
.Xr open 2 ,
|
||||
.Xr execl 3 ,
|
||||
.Xr exit 3 ,
|
||||
.Xr sysctl 3 ,
|
||||
|
|
@ -299,8 +345,15 @@ A future update of the Standard is expected to require this behavior,
|
|||
and it may become the default for non-privileged processes as well.
|
||||
.\" NB: update this caveat when TC1 is blessed.
|
||||
The support for executing interpreted programs is an extension.
|
||||
The
|
||||
.Fn fexecve
|
||||
system call conforms to The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn execve
|
||||
system call appeared in
|
||||
.Bx 4.2 .
|
||||
The
|
||||
.Fn fexecve
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)link.2 8.3 (Berkeley) 1/12/94
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 9, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt LINK 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm link
|
||||
.Nm link ,
|
||||
.Nm linkat
|
||||
.Nd make a hard file link
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,10 @@
|
|||
.In unistd.h
|
||||
.Ft int
|
||||
.Fn link "const char *name1" "const char *name2"
|
||||
.Ft int
|
||||
.Fo linkat
|
||||
.Fa "int fd1" "const char *name1" "int fd2" "const char *name2" "int flag"
|
||||
.Fc
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn link
|
||||
|
|
@ -79,6 +84,67 @@ The
|
|||
.Fa name1
|
||||
argument
|
||||
may not be a directory.
|
||||
.Pp
|
||||
The
|
||||
.Fn linkat
|
||||
system call is equivalent to
|
||||
.Fa link
|
||||
except in the case where either
|
||||
.Fa name1
|
||||
or
|
||||
.Fa name2
|
||||
or both are relative paths.
|
||||
In this case a relative path
|
||||
.Fa name1
|
||||
is interpreted relative to
|
||||
the directory associated with the file descriptor
|
||||
.Fa fd1
|
||||
instead of the current working directory and similarly for
|
||||
.Fa name2
|
||||
and the file descriptor
|
||||
.Fa fd2 .
|
||||
.Pp
|
||||
Values for
|
||||
.Fa flag
|
||||
are constructed by a bitwise-inclusive OR of flags from the following
|
||||
list, defined in
|
||||
.In fcntl.h :
|
||||
.Bl -tag -width indent
|
||||
.It Dv AT_SYMLINK_NOFOLLOW
|
||||
If
|
||||
.Fa name1
|
||||
names a symbolic link, a new link for the target of the symbolic link is
|
||||
created.
|
||||
.El
|
||||
.Pp
|
||||
If
|
||||
.Fn linkat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd1
|
||||
or
|
||||
.Fa fd2
|
||||
parameter, the current working directory is used for the respective
|
||||
.Fa name
|
||||
argument.
|
||||
If both
|
||||
.Fa fd1
|
||||
and
|
||||
.Fa fd2
|
||||
have value
|
||||
.Dv AT_FDCWD ,
|
||||
the behavior is identical to a call to
|
||||
.Fn link .
|
||||
Unless
|
||||
.Fa flag
|
||||
contains the
|
||||
.Dv AT_SYMLINK_FOLLOW
|
||||
flag, if
|
||||
.Fa name1
|
||||
names a symbolic link, a new link is created for the symbolic link
|
||||
.Fa name1
|
||||
and not its target.
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std link
|
||||
.Sh ERRORS
|
||||
|
|
@ -156,6 +222,42 @@ system.
|
|||
One of the pathnames specified
|
||||
is outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn link ,
|
||||
the
|
||||
.Fn linkat
|
||||
system call may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa name1
|
||||
or
|
||||
.Fa name2
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd1
|
||||
or
|
||||
.Fa fd2
|
||||
argument, respectively, is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er EINVAL
|
||||
The value of the
|
||||
.Fa flag
|
||||
argument is not valid.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa name1
|
||||
or
|
||||
.Fa name2
|
||||
argument is not an absolute path and
|
||||
.Fa fd1
|
||||
or
|
||||
.Fa fd2 ,
|
||||
respectively, is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr readlink 2 ,
|
||||
|
|
@ -166,15 +268,21 @@ The
|
|||
.Fn link
|
||||
system call is expected to conform to
|
||||
.St -p1003.1-90 .
|
||||
The
|
||||
.Fn linkat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn link
|
||||
function appeared in
|
||||
.At v7 .
|
||||
The
|
||||
.Fn linkat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
.Pp
|
||||
The
|
||||
.Fn link
|
||||
system call traditionally allows the super-user to link directories which
|
||||
corrupts the file system coherency.
|
||||
This implementation no longer permits
|
||||
it.
|
||||
This implementation no longer permits it.
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)mkdir.2 8.2 (Berkeley) 12/11/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 9, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt MKDIR 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm mkdir
|
||||
.Nm mkdir ,
|
||||
.Nm mkdirat
|
||||
.Nd make a directory file
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -41,6 +42,8 @@
|
|||
.In sys/stat.h
|
||||
.Ft int
|
||||
.Fn mkdir "const char *path" "mode_t mode"
|
||||
.Ft int
|
||||
.Fn mkdirat "int fd" "const char *path" "mode_t mode"
|
||||
.Sh DESCRIPTION
|
||||
The directory
|
||||
.Fa path
|
||||
|
|
@ -53,6 +56,27 @@ of the calling process.
|
|||
The directory's owner ID is set to the process's effective user ID.
|
||||
The directory's group ID is set to that of the parent directory in
|
||||
which it is created.
|
||||
.Pp
|
||||
The
|
||||
.Fn mkdirat
|
||||
system call is equivalent to
|
||||
.Fn mkdir
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the newly created directory is created relative to the
|
||||
directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn mkdirat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn mkdir .
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std mkdir
|
||||
.Sh ERRORS
|
||||
|
|
@ -106,6 +130,30 @@ The
|
|||
argument
|
||||
points outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn mkdir ,
|
||||
the
|
||||
.Fn mkdirat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr chmod 2 ,
|
||||
|
|
@ -116,3 +164,11 @@ The
|
|||
.Fn mkdir
|
||||
system call is expected to conform to
|
||||
.St -p1003.1-90 .
|
||||
The
|
||||
.Fn mkdirat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn mkdirat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 10, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt MKFIFO 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm mkfifo
|
||||
.Nm mkfifo ,
|
||||
.Nm mkfifoat
|
||||
.Nd make a fifo file
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -41,6 +42,8 @@
|
|||
.In sys/stat.h
|
||||
.Ft int
|
||||
.Fn mkfifo "const char *path" "mode_t mode"
|
||||
.Ft int
|
||||
.Fn mkfifoat "int fd" "const char *path" "mode_t mode"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn mkfifo
|
||||
|
|
@ -57,6 +60,27 @@ of the calling process.
|
|||
The fifo's owner ID is set to the process's effective user ID.
|
||||
The fifo's group ID is set to that of the parent directory in
|
||||
which it is created.
|
||||
.Pp
|
||||
The
|
||||
.Fn mkfifoat
|
||||
system call is equivalent to
|
||||
.Fn mkfifo
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the newly created FIFO is created relative to the
|
||||
directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn mkfifoat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn mkfifo .
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std mkfifo
|
||||
.Sh ERRORS
|
||||
|
|
@ -116,6 +140,30 @@ The
|
|||
argument
|
||||
points outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn mkfifo ,
|
||||
the
|
||||
.Fn mkfifoat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr chmod 2 ,
|
||||
|
|
@ -127,3 +175,11 @@ The
|
|||
.Fn mkfifo
|
||||
system call is expected to conform to
|
||||
.St -p1003.1-90 .
|
||||
The
|
||||
.Fn mkfifoat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn mkfifoat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)mknod.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd June 4, 1993
|
||||
.Dd April 10, 2008
|
||||
.Dt MKNOD 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm mknod
|
||||
.Nm mknod ,
|
||||
.Nm mknodat
|
||||
.Nd make a special file node
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,8 @@
|
|||
.In unistd.h
|
||||
.Ft int
|
||||
.Fn mknod "const char *path" "mode_t mode" "dev_t dev"
|
||||
.Ft int
|
||||
.Fn mknodat "int fd" "const char *path" "mode_t mode" "dev_t dev"
|
||||
.Sh DESCRIPTION
|
||||
The file system node
|
||||
.Fa path
|
||||
|
|
@ -61,6 +64,27 @@ The
|
|||
.Fn mknod
|
||||
system call
|
||||
requires super-user privileges.
|
||||
.Pp
|
||||
The
|
||||
.Fn mknodat
|
||||
system call is equivalent to
|
||||
.Fn mknod
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the newly created device node is created relative to the
|
||||
directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn mknodat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn mknod .
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std mknod
|
||||
.Sh ERRORS
|
||||
|
|
@ -114,13 +138,45 @@ file (or a
|
|||
.Em whiteout )
|
||||
is not supported.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn mknod ,
|
||||
the
|
||||
.Fn mknodat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chmod 2 ,
|
||||
.Xr mkfifo 2 ,
|
||||
.Xr stat 2 ,
|
||||
.Xr umask 2
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Fn mknodat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn mknod
|
||||
function appeared in
|
||||
.At v6 .
|
||||
The
|
||||
.Fn mknodat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,23 +28,25 @@
|
|||
.\" @(#)open.2 8.2 (Berkeley) 11/16/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd January 7, 2007
|
||||
.Dd April 10, 2008
|
||||
.Dt OPEN 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm open
|
||||
.Nd open or create a file for reading or writing
|
||||
.Nm open , openat
|
||||
.Nd open or create a file for reading, writing or executing
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
.Sh SYNOPSIS
|
||||
.In fcntl.h
|
||||
.Ft int
|
||||
.Fn open "const char *path" "int flags" "..."
|
||||
.Ft int
|
||||
.Fn openat "int fd" "const char *path" "int flags" "..."
|
||||
.Sh DESCRIPTION
|
||||
The file name specified by
|
||||
.Fa path
|
||||
is opened
|
||||
for reading and/or writing as specified by the
|
||||
for either execution or reading and/or writing as specified by the
|
||||
argument
|
||||
.Fa flags
|
||||
and the file descriptor returned to the calling process.
|
||||
|
|
@ -56,7 +58,9 @@ created if it does not exist (by specifying the
|
|||
flag).
|
||||
In this case
|
||||
.Fn open
|
||||
requires a third argument
|
||||
and
|
||||
.Fn openat
|
||||
require an additional argument
|
||||
.Fa "mode_t mode" ,
|
||||
and the file is created with mode
|
||||
.Fa mode
|
||||
|
|
@ -65,6 +69,32 @@ as described in
|
|||
and modified by the process' umask value (see
|
||||
.Xr umask 2 ) .
|
||||
.Pp
|
||||
The
|
||||
.Fn openat
|
||||
function is equivalent to the
|
||||
.Fn open
|
||||
function except in the case where the
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the file to be opened is determined relative to the directory
|
||||
associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
The
|
||||
.Fa flag
|
||||
parameter and the optional fourth parameter correspond exactly to
|
||||
the parameters of
|
||||
.Fn open .
|
||||
If
|
||||
.Fn openat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used
|
||||
and the behavior is identical to a call to
|
||||
.Fn open .
|
||||
.Pp
|
||||
The flags specified are formed by
|
||||
.Em or Ns 'ing
|
||||
the following values
|
||||
|
|
@ -73,6 +103,7 @@ the following values
|
|||
O_RDONLY open for reading only
|
||||
O_WRONLY open for writing only
|
||||
O_RDWR open for reading and writing
|
||||
O_EXEC open for execute only
|
||||
O_NONBLOCK do not block on open
|
||||
O_APPEND append on each write
|
||||
O_CREAT create file if it does not exist
|
||||
|
|
@ -180,7 +211,7 @@ system call will not assign controlling terminals on
|
|||
If successful,
|
||||
.Fn open
|
||||
returns a non-negative integer, termed a file descriptor.
|
||||
It returns -1 on failure.
|
||||
It returns \-1 on failure.
|
||||
The file pointer used to mark the current position within the
|
||||
file is set to the beginning of the file.
|
||||
.Pp
|
||||
|
|
@ -202,8 +233,10 @@ system call returns the current system limit.
|
|||
.Sh RETURN VALUES
|
||||
If successful,
|
||||
.Fn open
|
||||
returns a non-negative integer, termed a file descriptor.
|
||||
It returns -1 on failure, and sets
|
||||
and
|
||||
.Fn openat
|
||||
return a non-negative integer, termed a file descriptor.
|
||||
They return \-1 on failure, and set
|
||||
.Va errno
|
||||
to indicate the error.
|
||||
.Sh ERRORS
|
||||
|
|
@ -346,13 +379,32 @@ An attempt was made to open a descriptor with an illegal combination
|
|||
of
|
||||
.Dv O_RDONLY ,
|
||||
.Dv O_WRONLY ,
|
||||
.Dv O_RDWR
|
||||
and
|
||||
.Dv O_RDWR .
|
||||
.Dv O_EXEC.
|
||||
.It Bq Eq EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is
|
||||
neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Eq ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chmod 2 ,
|
||||
.Xr close 2 ,
|
||||
.Xr dup 2 ,
|
||||
.Xr fexecve 2 ,
|
||||
.Xr fhopen 2 ,
|
||||
.Xr getdtablesize 2 ,
|
||||
.Xr getfh 2 ,
|
||||
|
|
@ -367,3 +419,18 @@ The
|
|||
.Fn open
|
||||
function appeared in
|
||||
.At v6 .
|
||||
The
|
||||
.Fn openat
|
||||
function was introduced in
|
||||
.Fx 8.0 .
|
||||
.Sh BUGS
|
||||
The Open Group Extended API Set 2 specification requires that the test
|
||||
for whether
|
||||
.Fa fd
|
||||
is searchable is based on whether
|
||||
.Fa fd
|
||||
is open for searching, not whether the underlying directory currently
|
||||
permits searches.
|
||||
The present implementation of the
|
||||
.Fa openat
|
||||
checks the current permissions of directory instead.
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)readlink.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd February 26, 2008
|
||||
.Dd April 10, 2008
|
||||
.Dt READLINK 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm readlink
|
||||
.Nm readlink ,
|
||||
.Nm readlinkat
|
||||
.Nd read value of a symbolic link
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,10 @@
|
|||
.In unistd.h
|
||||
.Ft ssize_t
|
||||
.Fn readlink "const char *restrict path" "char *restrict buf" "size_t bufsiz"
|
||||
.Ft ssize_t
|
||||
.Fo readlinkat
|
||||
.Fa "int fd" "const char *restrict path" "char *restrict buf" "size_t bufsize"
|
||||
.Fc
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn readlink
|
||||
|
|
@ -56,6 +61,27 @@ system call does not append a
|
|||
.Dv NUL
|
||||
character to
|
||||
.Fa buf .
|
||||
.Pp
|
||||
The
|
||||
.Fn readlinkat
|
||||
system call is equivalent to
|
||||
.Fn readlink
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the symbolic link whose content is read relative to the
|
||||
directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn readlinkat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn readlink .
|
||||
.Sh RETURN VALUES
|
||||
The call returns the count of characters placed in the buffer
|
||||
if it succeeds, or a \-1 if an error occurs, placing the error
|
||||
|
|
@ -88,13 +114,45 @@ The
|
|||
argument
|
||||
extends outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn readlink ,
|
||||
the
|
||||
.Fn readlinkat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr lstat 2 ,
|
||||
.Xr stat 2 ,
|
||||
.Xr symlink 2 ,
|
||||
.Xr symlink 7
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Fn readlinkat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn readlink
|
||||
system call appeared in
|
||||
.Bx 4.2 .
|
||||
The
|
||||
.Fn readlinkat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@
|
|||
.\" @(#)rename.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 9, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt RENAME 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
|
|
@ -40,6 +40,8 @@
|
|||
.In stdio.h
|
||||
.Ft int
|
||||
.Fn rename "const char *from" "const char *to"
|
||||
.Ft int
|
||||
.Fn renameat "int fromfd" "const char *from" "int tofd" "const char *to"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn rename
|
||||
|
|
@ -73,6 +75,37 @@ If the final component of
|
|||
is a symbolic link,
|
||||
the symbolic link is renamed,
|
||||
not the file or directory to which it points.
|
||||
.Pp
|
||||
The
|
||||
.Fn renameat
|
||||
system call is equivalent to
|
||||
.Fn rename
|
||||
except in the case where either
|
||||
.Fa from
|
||||
or
|
||||
.Fa to
|
||||
specifies a relative path.
|
||||
If
|
||||
.Fa from
|
||||
is a relative path, the file to be renamed is located
|
||||
relative to the directory associated with the file descriptor
|
||||
.Fa fromfd
|
||||
instead of the current working directory.
|
||||
If the
|
||||
.Fa to
|
||||
is a relative path, the same happens only relative to the directory associated
|
||||
with
|
||||
.Fa tofd .
|
||||
If the
|
||||
.Fn renameat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fromfd
|
||||
or
|
||||
.Fa tofd
|
||||
parameter, the current working directory is used in the determination
|
||||
of the file for the respective path parameter.
|
||||
.\".Sh CAVEAT
|
||||
.\"The system can deadlock if a loop in the file system graph is present.
|
||||
.\"This loop takes the form of an entry in directory
|
||||
|
|
@ -215,6 +248,42 @@ The
|
|||
argument
|
||||
is a directory and is not empty.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn rename ,
|
||||
the
|
||||
.Fn renameat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa from
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fromfd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching, or the
|
||||
.Fa to
|
||||
argument does not specify an absolute path and the
|
||||
.Fa tofd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa from
|
||||
argument is not an absolute path and
|
||||
.Fa fromfd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory, or the
|
||||
.Fa to
|
||||
argument is not an absolute path and
|
||||
.Fa tofd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr open 2 ,
|
||||
|
|
@ -224,3 +293,11 @@ The
|
|||
.Fn rename
|
||||
system call is expected to conform to
|
||||
.St -p1003.1-96 .
|
||||
The
|
||||
.Fn renameat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn renameat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,13 +28,14 @@
|
|||
.\" @(#)stat.2 8.4 (Berkeley) 5/1/95
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd October 12, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt STAT 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm stat ,
|
||||
.Nm lstat ,
|
||||
.Nm fstat
|
||||
.Nm fstat ,
|
||||
.Nm fstatat
|
||||
.Nd get file status
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -47,6 +48,8 @@
|
|||
.Fn lstat "const char *path" "struct stat *sb"
|
||||
.Ft int
|
||||
.Fn fstat "int fd" "struct stat *sb"
|
||||
.Ft int
|
||||
.Fn fstatat "int fd" "const char *path" "struct stat *buf" "int flag"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn stat
|
||||
|
|
@ -75,6 +78,48 @@ known by the file descriptor
|
|||
.Fa fd .
|
||||
.Pp
|
||||
The
|
||||
.Fn fstatat
|
||||
system call is equivalent to
|
||||
.Fn stat
|
||||
and
|
||||
.Fn lstat
|
||||
except in the case where the
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the status is retrieved from a file relative to
|
||||
the directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
.Pp
|
||||
The values for the
|
||||
.Fa flag
|
||||
are constructed by a bitwise-inclusive OR of flags from the following list,
|
||||
defined in
|
||||
.In fcntl.h :
|
||||
.Bl -tag -width indent
|
||||
.It Dv AT_SYMLINK_NOFOLLOW
|
||||
If
|
||||
.Fa path
|
||||
names a symbolic link, the status of the symbolic link is returned.
|
||||
.El
|
||||
.Pp
|
||||
If
|
||||
.Fn fstatat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn stat
|
||||
or
|
||||
.Fn lstat
|
||||
respectively, depending on whether or not the
|
||||
.Dv AT_SYMLINK_NOFOLLOW
|
||||
bit is set in
|
||||
.Fa flag .
|
||||
.Pp
|
||||
The
|
||||
.Fa sb
|
||||
argument is a pointer to a
|
||||
.Vt stat
|
||||
|
|
@ -315,6 +360,34 @@ The file size in bytes cannot be
|
|||
represented correctly in the structure pointed to by
|
||||
.Fa sb .
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn lstat ,
|
||||
the
|
||||
.Fn fstatat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er EINVAL
|
||||
The value of the
|
||||
.Fa flag
|
||||
argument is not valid.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr access 2 ,
|
||||
.Xr chmod 2 ,
|
||||
|
|
@ -331,6 +404,9 @@ and
|
|||
.Fn fstat
|
||||
system calls are expected to conform to
|
||||
.St -p1003.1-90 .
|
||||
The
|
||||
.Fn fchownat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn stat
|
||||
|
|
@ -342,6 +418,10 @@ The
|
|||
.Fn lstat
|
||||
system call appeared in
|
||||
.Bx 4.2 .
|
||||
The
|
||||
.Fn fstatat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
.Sh BUGS
|
||||
Applying
|
||||
.Fn fstat
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)symlink.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 9, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt SYMLINK 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm symlink
|
||||
.Nm symlink ,
|
||||
.Nm symlinkat
|
||||
.Nd make symbolic link to a file
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,8 @@
|
|||
.In unistd.h
|
||||
.Ft int
|
||||
.Fn symlink "const char *name1" "const char *name2"
|
||||
.Ft int
|
||||
.Fn symlinkat "const char *name1" "int fd" "const char *name2"
|
||||
.Sh DESCRIPTION
|
||||
A symbolic link
|
||||
.Fa name2
|
||||
|
|
@ -53,6 +56,27 @@ is the string
|
|||
used in creating the symbolic link).
|
||||
Either name may be an arbitrary path name; the files need not
|
||||
be on the same file system.
|
||||
.Pp
|
||||
The
|
||||
.Fn symlinkat
|
||||
system call is equivalent to
|
||||
.Fn symlink
|
||||
except in the case where
|
||||
.Fa name2
|
||||
specifies a relative path.
|
||||
In this case the symbolic link is created relative to the directory
|
||||
associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn symlinkat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fn symlink .
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std symlink
|
||||
.Sh ERRORS
|
||||
|
|
@ -135,6 +159,30 @@ or
|
|||
argument
|
||||
points outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn symlink ,
|
||||
the
|
||||
.Fn symlinkat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa name2
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa name2
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr ln 1 ,
|
||||
.Xr chflags 2 ,
|
||||
|
|
@ -143,8 +191,16 @@ points outside the process's allocated address space.
|
|||
.Xr readlink 2 ,
|
||||
.Xr unlink 2 ,
|
||||
.Xr symlink 7
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Fn symlinkat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn symlink
|
||||
system call appeared in
|
||||
.Bx 4.2 .
|
||||
The
|
||||
.Fn symlinkat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
|
|
@ -28,11 +28,12 @@
|
|||
.\" @(#)unlink.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 10, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt UNLINK 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm unlink
|
||||
.Nm unlink ,
|
||||
.Nm unlinkat
|
||||
.Nd remove directory entry
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -40,6 +41,8 @@
|
|||
.In unistd.h
|
||||
.Ft int
|
||||
.Fn unlink "const char *path"
|
||||
.Ft int
|
||||
.Fn unlinkat "int fd" "const char *path" "int flag"
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Fn unlink
|
||||
|
|
@ -59,6 +62,49 @@ The
|
|||
.Fa path
|
||||
argument
|
||||
may not be a directory.
|
||||
.Pp
|
||||
The
|
||||
.Fn unlinkat
|
||||
system call is equivalent to
|
||||
.Fn unlink
|
||||
or
|
||||
.Fn rmdir
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the directory entry to be removed is determined
|
||||
relative to the directory associated with the file descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
.Pp
|
||||
The values for
|
||||
.Fa flag
|
||||
are constructed by a bitwise-inclusive OR of flags from the following list,
|
||||
defined in
|
||||
.In fcntl.h :
|
||||
.Bl -tag -width indent
|
||||
.It Dv AT_REMOVEDIR
|
||||
Remove the directory entry specified by
|
||||
.Fa fd
|
||||
and
|
||||
.Fa path
|
||||
as a directory, not a normal file.
|
||||
.El
|
||||
.Pp
|
||||
If
|
||||
.Fn unlinkat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is
|
||||
identical to a call to
|
||||
.Fa unlink
|
||||
or
|
||||
.Fa rmdir
|
||||
respectively, depending on whether or not the
|
||||
.Dv AT_REMOVEDIR
|
||||
bit is set in flag.
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std unlink
|
||||
.Sh ERRORS
|
||||
|
|
@ -104,21 +150,74 @@ The
|
|||
argument
|
||||
points outside the process's allocated address space.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn unlink ,
|
||||
the
|
||||
.Fn unlinkat
|
||||
may fail if
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er EEXIST
|
||||
The
|
||||
.Fa flag
|
||||
parameter has the
|
||||
.Dv AT_REMOVEDIR
|
||||
bit set and the
|
||||
.Fa path
|
||||
argument names a directory that is not an empty directory,
|
||||
or there are hard links to the directory other than dot or
|
||||
a single entry in dot-dot.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa flag
|
||||
parameter has the
|
||||
.Dv AT_REMOVEDIR
|
||||
bit set and
|
||||
.Fa path
|
||||
does not name a directory.
|
||||
.It Bq Er EINVAL
|
||||
The value of the
|
||||
.Fa flag
|
||||
argument is not valid.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr close 2 ,
|
||||
.Xr link 2 ,
|
||||
.Xr rmdir 2 ,
|
||||
.Xr symlink 7
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Fn unlinkat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn unlink
|
||||
function appeared in
|
||||
.At v6 .
|
||||
The
|
||||
.Fn unlinkat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
.Pp
|
||||
The
|
||||
.Fn unlink
|
||||
system call traditionally allows the super-user to unlink directories which
|
||||
can damage the file system integrity.
|
||||
This implementation no longer permits
|
||||
it.
|
||||
This implementation no longer permits it.
|
||||
|
|
|
|||
|
|
@ -30,13 +30,14 @@
|
|||
.\" @(#)utimes.2 8.1 (Berkeley) 6/4/93
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd December 9, 2006
|
||||
.Dd April 10, 2008
|
||||
.Dt UTIMES 2
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm utimes ,
|
||||
.Nm lutimes ,
|
||||
.Nm futimes
|
||||
.Nm futimes ,
|
||||
.Nm futimesat
|
||||
.Nd set file access and modification times
|
||||
.Sh LIBRARY
|
||||
.Lb libc
|
||||
|
|
@ -48,6 +49,8 @@
|
|||
.Fn lutimes "const char *path" "const struct timeval *times"
|
||||
.Ft int
|
||||
.Fn futimes "int fd" "const struct timeval *times"
|
||||
.Ft int
|
||||
.Fn futimesat "int fd" "const char *path" "const struct timeval times[2]"
|
||||
.Sh DESCRIPTION
|
||||
The access and modification times of the file named by
|
||||
.Fa path
|
||||
|
|
@ -97,6 +100,28 @@ changes the access and modification times of the link,
|
|||
while
|
||||
.Fn utimes
|
||||
changes the times of the file the link references.
|
||||
.Pp
|
||||
The
|
||||
.Fn futimesat
|
||||
system call is equivalent to
|
||||
.Fn utimes
|
||||
except in the case where
|
||||
.Fa path
|
||||
specifies a relative path.
|
||||
In this case the access and modification time
|
||||
is set to that of a file relative to the directory associated with the file
|
||||
descriptor
|
||||
.Fa fd
|
||||
instead of the current working directory.
|
||||
If
|
||||
.Fn futimesat
|
||||
is passed the special value
|
||||
.Dv AT_FDCWD
|
||||
in the
|
||||
.Fa fd
|
||||
parameter, the current working directory is used and the behavior is identical to
|
||||
a call to
|
||||
.Fn utimes .
|
||||
.Sh RETURN VALUES
|
||||
.Rv -std
|
||||
.Sh ERRORS
|
||||
|
|
@ -197,10 +222,42 @@ does not match the owner of the file and is not the super-user.
|
|||
.It Bq Er EROFS
|
||||
The file system containing the file is mounted read-only.
|
||||
.El
|
||||
.Pp
|
||||
In addition to the errors returned by the
|
||||
.Fn utimes ,
|
||||
the
|
||||
.Fn futimesat
|
||||
may fail if:
|
||||
.Bl -tag -width Er
|
||||
.It Bq Er EBADF
|
||||
The
|
||||
.Fa path
|
||||
argument does not specify an absolute path and the
|
||||
.Fa fd
|
||||
argument is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a valid file descriptor open for searching.
|
||||
.It Bq Er ENOTDIR
|
||||
The
|
||||
.Fa path
|
||||
argument is not an absolute path and
|
||||
.Fa fd
|
||||
is neither
|
||||
.Dv AT_FDCWD
|
||||
nor a file descriptor associated with a directory.
|
||||
.El
|
||||
.Sh SEE ALSO
|
||||
.Xr chflags 2 ,
|
||||
.Xr stat 2 ,
|
||||
.Xr utime 3
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Fn utimes
|
||||
function is expected to conform to
|
||||
.St -xpg4.2 .
|
||||
The
|
||||
.Fn futimesat
|
||||
system call follows The Open Group Extended API Set 2 specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Fn utimes
|
||||
|
|
@ -212,3 +269,7 @@ and
|
|||
.Fn lutimes
|
||||
system calls first appeared in
|
||||
.Fx 3.0 .
|
||||
The
|
||||
.Fn futimesat
|
||||
system call appeared in
|
||||
.Fx 8.0 .
|
||||
|
|
|
|||
Loading…
Reference in a new issue