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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* Determine current working directory. Linux version.
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Copyright (C) 1997-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* If we compile the file for use in ld.so we don't need the feature
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that getcwd() allocates the buffers itself. */
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#if IS_IN (rtld)
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# define NO_ALLOCATION 1
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#endif
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/* The "proc" filesystem provides an easy method to retrieve the value.
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For each process, the corresponding directory contains a symbolic link
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named `cwd'. Reading the content of this link immediate gives us the
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information. But we have to take care for systems which do not have
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the proc filesystem mounted. Use the POSIX implementation in this case. */
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/* Get the code for the generic version. */
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#define GETCWD_RETURN_TYPE static char *
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#include <sysdeps/posix/getcwd.c>
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char *
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__getcwd (char *buf, size_t size)
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{
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char *path;
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char *result;
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#ifndef NO_ALLOCATION
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size_t alloc_size = size;
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if (size == 0)
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{
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if (buf != NULL)
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{
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__set_errno (EINVAL);
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return NULL;
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}
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alloc_size = MAX (PATH_MAX, __getpagesize ());
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}
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if (buf == NULL)
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{
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path = malloc (alloc_size);
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if (path == NULL)
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return NULL;
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}
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else
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#else
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# define alloc_size size
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#endif
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path = buf;
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int retval;
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retval = INLINE_SYSCALL (getcwd, 2, path, alloc_size);
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if (retval > 0 && path[0] == '/')
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{
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#ifndef NO_ALLOCATION
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if (buf == NULL && size == 0)
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/* Ensure that the buffer is only as large as necessary. */
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buf = realloc (path, (size_t) retval);
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if (buf == NULL)
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/* Either buf was NULL all along, or `realloc' failed but
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we still have the original string. */
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buf = path;
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#endif
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return buf;
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}
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/* The system call either cannot handle paths longer than a page
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or can succeed without returning an absolute path. Just use the
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generic implementation right away. */
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if (retval >= 0 || errno == ENAMETOOLONG)
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{
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#ifndef NO_ALLOCATION
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if (buf == NULL && size == 0)
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{
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free (path);
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path = NULL;
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}
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#endif
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result = __getcwd_generic (path, size);
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#ifndef NO_ALLOCATION
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if (result == NULL && buf == NULL && size != 0)
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free (path);
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#endif
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return result;
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}
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/* It should never happen that the `getcwd' syscall failed because
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the buffer is too small if we allocated the buffer ourselves
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large enough. */
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assert (errno != ERANGE || buf != NULL || size != 0);
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#ifndef NO_ALLOCATION
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if (buf == NULL)
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free (path);
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#endif
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return NULL;
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}
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libc_hidden_def (__getcwd)
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weak_alias (__getcwd, getcwd)
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