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62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* Copyright (c) 2013 Nicholas Marriott <nicm@users.sourceforge.net>
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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 MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "tmux.h"
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int
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openat(int fd, const char *path, int flags, ...)
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{
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mode_t mode;
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va_list ap;
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int dotfd, retval, saved_errno;
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if (flags & O_CREAT) {
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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} else
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mode = 0;
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dotfd = -1;
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if (fd != AT_FDCWD) {
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dotfd = open(".", O_RDONLY);
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if (dotfd == -1)
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return (-1);
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if (fchdir(fd) != 0)
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return (-1);
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}
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retval = open(path, flags, mode);
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if (dotfd != -1) {
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if (fchdir(dotfd) != 0) {
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saved_errno = errno;
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close(retval);
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close(dotfd);
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errno = saved_errno;
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return (-1);
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}
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close(dotfd);
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}
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return (retval);
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}
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