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author | Roland McGrath <roland@gnu.org> | 2006-01-05 10:32:47 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 2006-01-05 10:32:47 +0000 |
commit | c90c5d4106a2903a40cc3213f8d172e5c6c7ffd6 (patch) | |
tree | dfe6853619664e591436f68e5a60f9330db82612 /sysdeps | |
parent | 06dc5bf35af0b12ff1b62960baf2abb844834e05 (diff) | |
download | glibc-c90c5d4106a2903a40cc3213f8d172e5c6c7ffd6.zip glibc-c90c5d4106a2903a40cc3213f8d172e5c6c7ffd6.tar.gz glibc-c90c5d4106a2903a40cc3213f8d172e5c6c7ffd6.tar.bz2 |
* io/sys/stat.h [__USE_GNU]: Declare fchmodat.
* io/fchmodat.c: New file.
* io/Makefile (routines): Add fchmodat.
* io/Versions (libc: GLIBC_2.4): Likewise.
* sysdeps/unix/sysv/linux/fchmodat.c: New file.
* io/tst-fchmodat.c: New file.
* io/Makefile (tests): Add it.
Diffstat (limited to 'sysdeps')
-rw-r--r-- | sysdeps/unix/sysv/linux/fchmodat.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/fchmodat.c b/sysdeps/unix/sysv/linux/fchmodat.c new file mode 100644 index 0000000..de35e43 --- /dev/null +++ b/sysdeps/unix/sysv/linux/fchmodat.c @@ -0,0 +1,87 @@ +/* Change the protections of file relative to open directory. Linux version. + Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <fcntl.h> +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <sys/types.h> +#include <alloca.h> +#include <sysdep.h> + +int +fchmodat (fd, file, mode, flag) + int fd; + const char *file; + mode_t mode; + int flag; +{ + if (flag & ~AT_SYMLINK_NOFOLLOW) + { + __set_errno (EINVAL); + return -1; + } +#ifndef __NR_lchmod /* Linux so far has no lchmod syscall. */ + if (flag & AT_SYMLINK_NOFOLLOW) + { + __set_errno (ENOTSUP); + return -1; + } +#endif + + char *buf = NULL; + + if (fd != AT_FDCWD && file[0] != '/') + { + size_t filelen = strlen (file); + static const char procfd[] = "/proc/self/fd/%d/%s"; + /* Buffer for the path name we are going to use. It consists of + - the string /proc/self/fd/ + - the file descriptor number + - the file name provided. + The final NUL is included in the sizeof. A bit of overhead + due to the format elements compensates for possible negative + numbers. */ + size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; + buf = alloca (buflen); + + __snprintf (buf, buflen, procfd, fd, file); + file = buf; + } + + int result; + INTERNAL_SYSCALL_DECL (err); + +#ifdef __NR_lchmod + if (flag & AT_SYMLINK_NOFOLLOW) + result = INTERNAL_SYSCALL (lchmod, err, 2, file, mode); + else +#endif + result = INTERNAL_SYSCALL (chmod, err, 2, file, mode); + + if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0)) + { + __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); + result = -1; + } + + return result; +} |