diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/chown.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/chown.c | 140 |
1 files changed, 73 insertions, 67 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/chown.c b/sysdeps/unix/sysv/linux/powerpc/chown.c index 4b283e720c..fdcbd3683a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/chown.c +++ b/sysdeps/unix/sysv/linux/powerpc/chown.c @@ -1,5 +1,5 @@ /* chown() compatibility. - Copyright (C) 1998, 2000, 2002, 2003 Free Software Foundation, Inc. + Copyright (C) 1998, 2000, 2002, 2003, 2005 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 @@ -24,6 +24,8 @@ #include <sysdep.h> #include <stdlib.h> +#include <kernel-features.h> + /* In Linux 2.1.x the chown functions have been changed. A new function lchown was introduced. The new chown now follows symlinks - the old chown and the @@ -34,58 +36,61 @@ int __chown (const char *file, uid_t owner, gid_t group) { - int err; - int old_errno; - char link[PATH_MAX+2]; - char path[2*PATH_MAX+4]; - int loopct; - size_t filelen; - static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */; - - if (libc_old_chown == 1) - return INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group); - - old_errno = errno; - -#ifdef __NR_lchown - if (libc_old_chown == 0) - { - err = INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group); - if (err != -1 || errno != ENOSYS) - { - libc_old_chown = 1; - return err; - } - libc_old_chown = -1; - } -#endif - - err = __readlink (file, link, PATH_MAX+1); - if (err == -1) - { - errno = old_errno; - return __lchown(file, owner, group); - } - - filelen = strlen (file) + 1; - if (filelen > sizeof(path)) - { - errno = ENAMETOOLONG; - return -1; - } - memcpy (path, file, filelen); - - /* 'The system has an arbitrary limit...' In practise, we'll hit - ENAMETOOLONG before this, usually. */ - for (loopct = 0; loopct < 128; loopct++) - { - size_t linklen; - - if (err >= PATH_MAX+1) - { - errno = ENAMETOOLONG; - return -1; - } +#if __ASSUME_LCHOWN_SYSCALL + return INLINE_SYSCALL (chown, 3, file, owner, group); +#else + int err; + int old_errno; + char link[PATH_MAX + 2]; + char path[2 * PATH_MAX + 4]; + int loopct; + size_t filelen; + static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */; + + if (libc_old_chown == 1) + return INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group); + + old_errno = errno; + +# ifdef __NR_lchown + if (libc_old_chown == 0) + { + err = INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group); + if (err != -1 || errno != ENOSYS) + { + libc_old_chown = 1; + return err; + } + libc_old_chown = -1; + } +# endif + + err = __readlink (file, link, PATH_MAX + 1); + if (err == -1) + { + __set_errno (old_errno); + return __lchown (file, owner, group); + } + + filelen = strlen (file) + 1; + if (filelen > sizeof (path)) + { + __set_errno (ENAMETOOLONG); + return -1; + } + memcpy (path, file, filelen); + + /* 'The system has an arbitrary limit...' In practise, we'll hit + ENAMETOOLONG before this, usually. */ + for (loopct = 0; loopct < 128; ++loopct) + { + size_t linklen; + + if (err >= PATH_MAX + 1) + { + __set_errno (ENAMETOOLONG); + return -1; + } link[err] = 0; /* Null-terminate string, just-in-case. */ @@ -97,28 +102,29 @@ __chown (const char *file, uid_t owner, gid_t group) { filelen = strlen (path); - while (filelen > 1 && path[filelen-1] == '/') - filelen--; - while (filelen > 0 && path[filelen-1] != '/') - filelen--; - if (filelen + linklen > sizeof(path)) + while (filelen > 1 && path[filelen - 1] == '/') + --filelen; + while (filelen > 0 && path[filelen - 1] != '/') + --filelen; + if (filelen + linklen > sizeof (path)) { errno = ENAMETOOLONG; return -1; } - memcpy (path+filelen, link, linklen); + memcpy (path + filelen, link, linklen); } - err = __readlink(path, link, PATH_MAX+1); + err = __readlink (path, link, PATH_MAX + 1); if (err == -1) - { - errno = old_errno; - return __lchown(path, owner, group); - } - } - errno = ELOOP; - return -1; + { + __set_errno (old_errno); + return __lchown (path, owner, group); + } + } + __set_errno (ELOOP); + return -1; +#endif } libc_hidden_def (__chown) |