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3ae18fdfbc
Linux has the convention of returning -ERRNO to flag errors from its system calls. Sometimes other negative values are returned that are success... However, only values -1 to -4096 (inclusive) are really errors. The rest are either truncated values that only look negative (so use long instead of int), or are things like addresses or legal unsigned file offsets or similar that are successful returns. Filter out the latter. Sponsored by: Netflix
226 lines
6.7 KiB
C
226 lines
6.7 KiB
C
/*
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* Copyright (c) 2022, Netflix, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Rewritten from the original host_syscall.h Copyright (C) 2014 Nathan Whitehorn
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*/
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#ifndef _HOST_SYSCALL_H
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#define _HOST_SYSCALL_H
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#include <stand.h>
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#include <assert.h>
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long host_syscall(int number, ...);
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/*
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* Sizes taken from musl's include/alltypes.h.in and expanded for LP64 hosts
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*/
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typedef uint64_t host_dev_t;
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typedef uint64_t host_ino_t;
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typedef unsigned int host_mode_t;
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typedef unsigned int host_uid_t;
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typedef unsigned int host_gid_t;
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typedef int64_t host_off_t;
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typedef long host_blksize_t;
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typedef int64_t host_blkcnt_t;
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#include "stat_arch.h"
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/*
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* stat flags
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* These are arch independent and match the values in nolib and uapi headers
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* with HOST_ prepended.
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*/
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#define HOST_S_IFMT 0170000
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#define HOST_S_IFIFO 0010000
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#define HOST_S_IFCHR 0020000
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#define HOST_S_IFDIR 0040000
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#define HOST_S_IFBLK 0060000
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#define HOST_S_IFREG 0100000
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#define HOST_S_IFLNK 0120000
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#define HOST_S_IFSOCK 0140000
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#define HOST_S_ISBLK(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFBLK)
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#define HOST_S_ISCHR(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFCHR)
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#define HOST_S_ISDIR(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFDIR)
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#define HOST_S_ISFIFO(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFIFO)
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#define HOST_S_ISLNK(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFLNK)
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#define HOST_S_ISREG(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFREG)
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#define HOST_S_ISSOCK(mode) (((mode) & HOST_S_IFMT) == HOST_S_IFSOCK)
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/*
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* Constants for open, fcntl, etc
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*
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* Note: Some of these are arch dependent on Linux, but are the same for
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* powerpc, x86, arm*, and riscv. We should be futureproof, though, since these
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* are the 'generic' values and only older architectures (no longer supported by
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* FreeBSD) vary.
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*
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* These are from tools/include/uapi/asm-generic/fcntl.h and use the octal
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* notation. Beware, hex is used in other places creating potential confsion.
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*/
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#define HOST_O_RDONLY 0
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#define HOST_O_WRONLY 1
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#define HOST_O_RDWR 2
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#define HOST_O_CREAT 00100
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#define HOST_O_EXCL 00200
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#define HOST_O_NOCTTY 00400
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#define HOST_O_TRUNC 01000
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#define HOST_O_APPEND 02000
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#define HOST_O_NONBLOCK 04000
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#define HOST_AT_FDCWD -100 /* Relative to current directory */
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/*
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* Data types
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*/
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struct old_utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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};
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struct host_timeval {
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time_t tv_sec;
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long tv_usec;
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};
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/*
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* Must match Linux's values see linux/tools/include/uapi/asm-generic/mman-common.h
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* and linux/tools/include/linux/mman.h
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*
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* And pre-pend HOST_ here.
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*/
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#define HOST_PROT_READ 0x1
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#define HOST_PROT_WRITE 0x2
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#define HOST_PROT_EXEC 0x4
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#define HOST_MAP_SHARED 0x01
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#define HOST_MAP_PRIVATE 0x02
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#define HOST_MAP_FIXED 0x10
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#define HOST_MAP_ANONYMOUS 0x20
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#define HOST_MAP_FAILED ((void *)-1)
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/* Mount flags from uapi */
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#define MS_RELATIME (1 << 21)
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#define HOST_REBOOT_MAGIC1 0xfee1dead
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#define HOST_REBOOT_MAGIC2 672274793
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#define HOST_REBOOT_CMD_KEXEC 0x45584543
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/*
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* Values from linux/tools/include/uapi/linux/kexec.h
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*/
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/*
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* Values match ELF architecture types.
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*/
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#define HOST_KEXEC_ARCH_X86_64 (62 << 16)
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#define HOST_KEXEC_ARCH_PPC64 (21 << 16)
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#define HOST_KEXEC_ARCH_ARM (40 << 16)
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#define HOST_KEXEC_ARCH_AARCH64 (183 << 16)
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#define HOST_KEXEC_ARCH_RISCV (243 << 16)
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/* Arbitrary cap on segments */
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#define HOST_KEXEC_SEGMENT_MAX 16
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struct host_kexec_segment {
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void *buf;
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int bufsz;
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void *mem;
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int memsz;
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};
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struct host_dirent64 {
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uint64_t d_ino; /* 64-bit inode number */
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int64_t d_off; /* 64-bit offset to next structure */
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unsigned short d_reclen; /* Size of this dirent */
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unsigned char d_type; /* File type */
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char d_name[]; /* Filename (null-terminated) */
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};
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/* d_type values */
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#define HOST_DT_UNKNOWN 0
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#define HOST_DT_FIFO 1
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#define HOST_DT_CHR 2
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#define HOST_DT_DIR 4
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#define HOST_DT_BLK 6
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#define HOST_DT_REG 8
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#define HOST_DT_LNK 10
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#define HOST_DT_SOCK 12
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#define HOST_DT_WHT 14
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/*
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* System Calls
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*/
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int host_close(int fd);
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int host_dup(int fd);
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int host_exit(int code);
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int host_fstat(int fd, struct host_kstat *sb);
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int host_getdents64(int fd, void *dirp, int count);
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int host_getpid(void);
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int host_gettimeofday(struct host_timeval *a, void *b);
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int host_ioctl(int fd, unsigned long request, unsigned long arg);
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int host_kexec_load(unsigned long entry, unsigned long nsegs, struct host_kexec_segment *segs, unsigned long flags);
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ssize_t host_llseek(int fd, int32_t offset_high, int32_t offset_lo, uint64_t *result, int whence);
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int host_mkdir(const char *, host_mode_t);
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void *host_mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off);
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int host_mount(const char *src, const char *target, const char *type,
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unsigned long flags, void *data);
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int host_munmap(void *addr, size_t len);
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int host_open(const char *path, int flags, int mode);
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ssize_t host_read(int fd, void *buf, size_t nbyte);
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int host_reboot(int, int, int, uintptr_t);
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int host_select(int nfds, long *readfds, long *writefds, long *exceptfds,
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struct host_timeval *timeout);
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int host_stat(const char *path, struct host_kstat *sb);
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int host_symlink(const char *path1, const char *path2);
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int host_uname(struct old_utsname *);
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ssize_t host_write(int fd, const void *buf, size_t nbyte);
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/*
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* Wrappers / one-liners
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*/
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#define host_getmem(size) \
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host_mmap(0, size, HOST_PROT_READ | HOST_PROT_WRITE, \
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HOST_MAP_PRIVATE | HOST_MAP_ANONYMOUS, -1, 0);
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/*
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* Since we have to interface with the 'raw' system call, we have to cope with
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* Linux's conventions. To run on the most architectures possible, they don't
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* return errors through some CPU flag, but instead, return a negative value for
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* an error, and a positive one for success. However, there's some issues since
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* addresses have to be returned, some of which are also negative, so Linus
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* declared that no successful result could be -4096 to 0. This implements
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* that quirk so we can check return values easily.
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*/
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static __inline bool
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is_linux_error(long e)
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{
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return (e < 0 && e >= -4096);
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}
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/*
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* Translate Linux errno to FreeBSD errno. The two system have idenitcal errors
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* for 1-34. After that, they differ. Linux also has errno that don't map
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* exactly to FreeBSD's errno, plus the Linux errno are arch dependent >
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* 34. Since we just need to do this for simple cases, use the simple mapping
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* function where -1 to -34 are translated to 1 to 34 and all others are EINVAL.
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* Pass the linux return value, which will be the -errno. Linux returns these
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* values as a 'long' which has to align to CPU register size, so accept that
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* size as the error so the assert can catch more values.
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*/
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static __inline int
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host_to_stand_errno(long e)
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{
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assert(is_linux_error(e));
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return((-e) > 34 ? EINVAL : (-e));
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}
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#endif
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