mirror of
https://github.com/slicer69/doas
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90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Copyright (c) 2004-2005, 2007, 2010, 2012-2014
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* closefrom.c original: libbsd/src/closefrom.c */
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <dirent.h>
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static inline void
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closefrom_close(int fd)
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{
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#ifdef __APPLE__
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/* Avoid potential libdispatch crash when we close its fds. */
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(void)fcntl(fd, F_SETFD, FD_CLOEXEC);
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#else
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(void)close(fd);
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#endif
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}
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void
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closefrom(int lowfd)
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{
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const char *path;
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DIR *dirp;
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struct dirent *dent;
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int *fd_array = NULL;
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int fd_array_used = 0;
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int fd_array_size = 0;
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int i;
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/* Use /proc/self/fd (or /dev/fd on FreeBSD) if it exists. */
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# if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)
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path = "/dev/fd";
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# else
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path = "/proc/self/fd";
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# endif
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dirp = opendir(path);
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if (dirp == NULL)
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return;
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while ((dent = readdir(dirp)) != NULL) {
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const char *errstr;
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int fd;
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fd = strtonum(dent->d_name, lowfd, INT_MAX, &errstr);
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if (errstr != NULL || fd == dirfd(dirp))
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continue;
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if (fd_array_used >= fd_array_size) {
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int *ptr;
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if (fd_array_size > 0)
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fd_array_size *= 2;
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else
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fd_array_size = 32;
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ptr = reallocarray(fd_array, fd_array_size, sizeof(int));
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if (ptr == NULL) {
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break;
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}
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fd_array = ptr;
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}
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fd_array[fd_array_used++] = fd;
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}
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for (i = 0; i < fd_array_used; i++)
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closefrom_close(fd_array[i]);
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free(fd_array);
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(void)closedir(dirp);
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}
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