Mercurial > gnulib
view lib/areadlink.c @ 40190:ef116535bf1a
relocatable-prog: Use $ORIGIN trick on more platforms.
* m4/relocatable.m4 (gl_RELOCATABLE_BODY): Use $ORIGIN trick also on
FreeBSD >= 7.3, DragonFly >= 3.0, NetBSD >= 8.0, OpenBSD >= 5.4,
Solaris >= 10, Haiku. But don't use it on Android.
* build-aux/reloc-ldflags: Allow the use of the $ORIGIN trick also on
Hurd, FreeBSD, DragonFly, NetBSD, OpenBSD, Solaris, Haiku.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Wed, 20 Feb 2019 02:39:52 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* areadlink.c -- readlink wrapper to return the link name in malloc'd storage Unlike xreadlink and xreadlink_with_size, don't ever call exit. Copyright (C) 2001, 2003-2007, 2009-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by Jim Meyering <jim@meyering.net> and Bruno Haible <bruno@clisp.org>. */ #include <config.h> /* Specification. */ #include "areadlink.h" #include "careadlinkat.h" #include <stdlib.h> #include <unistd.h> /* Get the symbolic link value of FILENAME and put it into BUFFER, with size BUFFER_SIZE. This function acts like readlink but has readlinkat's signature. */ static ssize_t careadlinkatcwd (int fd, char const *filename, char *buffer, size_t buffer_size) { /* FD must be AT_FDCWD here, otherwise the caller is using this function in contexts it was not meant for. */ if (fd != AT_FDCWD) abort (); return readlink (filename, buffer, buffer_size); } /* Call readlink to get the symbolic link value of FILENAME. Return a pointer to that NUL-terminated string in malloc'd storage. If readlink fails, return NULL and set errno. If allocation fails, or if the link value is longer than SIZE_MAX :-), return NULL and set errno to ENOMEM. */ char * areadlink (char const *filename) { return careadlinkat (AT_FDCWD, filename, NULL, 0, NULL, careadlinkatcwd); }