diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/faccessat.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/faccessat.c | 62 |
1 files changed, 42 insertions, 20 deletions
diff --git a/sysdeps/unix/sysv/linux/faccessat.c b/sysdeps/unix/sysv/linux/faccessat.c index 80b3b240f7..7c28280ae6 100644 --- a/sysdeps/unix/sysv/linux/faccessat.c +++ b/sysdeps/unix/sysv/linux/faccessat.c @@ -25,8 +25,10 @@ #include <unistd.h> #include <sys/types.h> #include <alloca.h> +#include <kernel-features.h> #include <sysdep.h> + int faccessat (fd, file, mode, flag) int fd; @@ -40,42 +42,61 @@ faccessat (fd, file, mode, flag) return -1; } - char *buf = NULL; + int result; - if (fd != AT_FDCWD && file[0] != '/') +#ifdef __NR_faccessat + if (flag == 0 +# ifndef __ASSUME_ATFCTS + && __have_atfcts >= 0 +# endif + ) { - 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; + result = INLINE_SYSCALL (faccessat, 3, fd, file, mode); +# ifndef __ASSUME_ATFCTS + if (result == -1 && errno == ENOSYS) + __have_atfcts = -1; + else +# endif + return result; } +#endif +#ifndef __ASSUME_ATFCTS if ((!(flag & AT_EACCESS) || ! __libc_enable_secure) -#ifndef __NR_laccess /* Linux so far has no laccess syscall. */ +# ifndef __NR_laccess /* Linux so far has no laccess syscall. */ && !(flag & AT_SYMLINK_NOFOLLOW) -#endif +# endif ) { /* If we are not set-uid or set-gid, access does the same. */ + 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_laccess +# ifdef __NR_laccess if (flag & AT_SYMLINK_NOFOLLOW) result = INTERNAL_SYSCALL (laccess, err, 2, file, mode); else -#endif +# endif result = INTERNAL_SYSCALL (access, err, 2, file, mode); if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0)) @@ -86,6 +107,7 @@ faccessat (fd, file, mode, flag) return result; } +#endif struct stat64 stats; if (fstatat64 (fd, file, &stats, flag & AT_SYMLINK_NOFOLLOW)) |