char * __getcwd (char *buf, size_t size) { char tmpbuf[PATH_MAX]; if (INLINE_SYSCALL (getcwd, 2, tmpbuf, PATH_MAX) >= 0) { size_t len = strlen (tmpbuf) + 1; if (size == 0) { if (__builtin_expect (buf != NULL, 0)) { __set_errno (EINVAL); return NULL; } buf = (char *) malloc (len); if (__builtin_expect (buf == NULL, 0)) { __set_errno (ENOMEM); return NULL; } } else { if (size < len) { __set_errno (ERANGE); return NULL; } if (buf == NULL) { buf = (char *) malloc (size); if (__builtin_expect (buf == NULL, 0)) { __set_errno (ENOMEM); return NULL; } } } memcpy (buf, tmpbuf, len); return buf; } return generic_getcwd (buf, size); }
char * __getcwd (char *buf, size_t size) { char *path; int n; char *result; if (no_syscall_getcwd && !have_new_dcache) return generic_getcwd (buf, size); #ifndef NO_ALLOCATION size_t alloc_size = size; if (size == 0) { if (buf != NULL) { __set_errno (EINVAL); return NULL; } alloc_size = PATH_MAX; } if (buf == NULL) { path = malloc (alloc_size); if (path == NULL) return NULL; } else #else # define alloc_size size #endif path = buf; #if defined __NR_getcwd || __LINUX_GETCWD_SYSCALL > 0 if (!no_syscall_getcwd) { int retval; retval = INLINE_SYSCALL (getcwd, 2, CHECK_STRING (path), alloc_size); if (retval >= 0) { # ifndef NO_ALLOCATION if (buf == NULL && size == 0) /* Ensure that the buffer is only as large as necessary. */ buf = realloc (path, (size_t) retval); if (buf == NULL) /* Either buf was NULL all along, or `realloc' failed but we still have the original string. */ buf = path; # endif return buf; } # if __ASSUME_GETCWD_SYSCALL /* It should never happen that the `getcwd' syscall failed because the buffer is too small if we allocated the buffer ourselves large enough. */ assert (errno != ERANGE || buf != NULL || size != 0); # ifndef NO_ALLOCATION if (buf == NULL) free (path); # endif return NULL; # else if (errno == ENOSYS) { no_syscall_getcwd = 1; have_new_dcache = 1; /* Now we will try the /proc method. */ } else if (errno != ERANGE || buf != NULL) { # ifndef NO_ALLOCATION if (buf == NULL) free (path); # endif return NULL; } # endif } #endif n = __readlink ("/proc/self/cwd", path, alloc_size - 1); if (n != -1) { if (path[0] == '/') { if ((size_t) n >= alloc_size - 1) { #ifndef NO_ALLOCATION if (buf == NULL) free (path); #endif return NULL; } path[n] = '\0'; #ifndef NO_ALLOCATION if (buf == NULL && size == 0) /* Ensure that the buffer is only as large as necessary. */ buf = realloc (path, (size_t) n + 1); if (buf == NULL) /* Either buf was NULL all along, or `realloc' failed but we still have the original string. */ buf = path; #endif return buf; } #ifndef have_new_dcache else have_new_dcache = 0; #endif } #if __ASSUME_GETCWD_SYSCALL == 0 /* Set to have_new_dcache only if error indicates that proc doesn't exist. */ if (errno != EACCES && errno != ENAMETOOLONG) have_new_dcache = 0; #endif #ifndef NO_ALLOCATION /* Don't put restrictions on the length of the path unless the user does. */ if (size == 0) { free (path); path = NULL; } #endif result = generic_getcwd (path, size); #ifndef NO_ALLOCATION if (result == NULL && buf == NULL && size != 0) free (path); #endif return result; }
char * __getcwd (char *buf, size_t size) { char *path; char *result; #ifndef NO_ALLOCATION size_t alloc_size = size; if (size == 0) { if (buf != NULL) { __set_errno (EINVAL); return NULL; } alloc_size = MAX (PATH_MAX, __getpagesize ()); } if (buf == NULL) { path = malloc (alloc_size); if (path == NULL) return NULL; } else #else # define alloc_size size #endif path = buf; int retval; retval = INLINE_SYSCALL (getcwd, 2, path, alloc_size); if (retval >= 0) { #ifndef NO_ALLOCATION if (buf == NULL && size == 0) /* Ensure that the buffer is only as large as necessary. */ buf = realloc (path, (size_t) retval); if (buf == NULL) /* Either buf was NULL all along, or `realloc' failed but we still have the original string. */ buf = path; #endif return buf; } /* The system call cannot handle paths longer than a page. Neither can the magic symlink in /proc/self. Just use the generic implementation right away. */ if (errno == ENAMETOOLONG) { #ifndef NO_ALLOCATION if (buf == NULL && size == 0) { free (path); path = NULL; } #endif result = generic_getcwd (path, size); #ifndef NO_ALLOCATION if (result == NULL && buf == NULL && size != 0) free (path); #endif return result; } /* It should never happen that the `getcwd' syscall failed because the buffer is too small if we allocated the buffer ourselves large enough. */ assert (errno != ERANGE || buf != NULL || size != 0); #ifndef NO_ALLOCATION if (buf == NULL) free (path); #endif return NULL; }