diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/getcwd.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/getcwd.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/getcwd.c b/sysdeps/unix/sysv/linux/getcwd.c index b14e5beb08..9695d8a035 100644 --- a/sysdeps/unix/sysv/linux/getcwd.c +++ b/sysdeps/unix/sysv/linux/getcwd.c @@ -31,6 +31,13 @@ #include "kernel-features.h" +/* If we compile the file for use in ld.so we don't need the feature + that getcwd() allocates the buffers itself. */ +#ifdef IS_IN_rtld +# define NO_ALLOCATION 1 +#endif + + #if __ASSUME_GETCWD_SYSCALL > 0 /* Kernel 2.1.92 introduced a third way to get the current working directory: a syscall. We've got to be careful that even when @@ -65,11 +72,12 @@ __getcwd (char *buf, size_t size) char *path; int n; char *result; - size_t alloc_size = size; 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) @@ -81,14 +89,17 @@ __getcwd (char *buf, size_t size) alloc_size = PATH_MAX; } - if (buf != NULL) - path = buf; - else + 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) @@ -98,6 +109,7 @@ __getcwd (char *buf, size_t size) 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); @@ -106,6 +118,7 @@ __getcwd (char *buf, size_t size) /* Either buf was NULL all along, or `realloc' failed but we still have the original string. */ buf = path; +# endif return buf; } @@ -116,8 +129,10 @@ __getcwd (char *buf, size_t size) large enough. */ assert (errno != ERANGE || buf != NULL || size != 0); +# ifndef NO_ALLOCATION if (buf == NULL) free (path); +# endif return NULL; # else @@ -128,8 +143,10 @@ __getcwd (char *buf, size_t size) } else if (errno != ERANGE || buf != NULL) { +# ifndef NO_ALLOCATION if (buf == NULL) free (path); +# endif return NULL; } # endif @@ -143,12 +160,15 @@ __getcwd (char *buf, size_t size) { 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); @@ -156,6 +176,7 @@ __getcwd (char *buf, size_t size) /* Either buf was NULL all along, or `realloc' failed but we still have the original string. */ buf = path; +#endif return buf; } @@ -172,17 +193,21 @@ __getcwd (char *buf, size_t size) 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; } |