Commit d8f97741 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

Replace fdopendir()

parent 5956c548
/*****************************************************************************
* fdopendir.c: POSIX fdopendir replacement
*****************************************************************************
* Copyright © 2011 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
DIR *fdopendir (int fd)
{
#ifdef F_GETFL
/* Check read permission on file descriptor */
int mode = fcntl (fd, F_GETFL);
if (mode == -1 || (mode & O_ACCMODE) == O_WRONLY)
{
errno = EBADF;
return NULL;
}
#endif
/* Check directory file type */
struct stat st;
if (fstat (fd, &st))
return NULL;
if (!S_ISDIR (st.st_mode))
{
errno = ENOTDIR;
return NULL;
}
/* Try to open the directory through /proc where available.
* Not all operating systems support this. Fix your libc! */
char path[sizeof ("/proc/self/fd/") + 3 * sizeof (int)];
sprintf (path, "/proc/self/fd/%u", fd);
DIR *dir = opendir (path);
if (dir != NULL)
{
close (fd);
return dir;
}
/* Hide impossible errors for fdopendir() */
switch (errno)
{
case EACCES:
#ifdef ELOOP
case ELOOP:
#endif
case ENAMETOOLONG:
case ENOENT:
case EMFILE:
case ENFILE:
errno = EIO;
}
return NULL;
}
......@@ -564,8 +564,8 @@ need_libc=false
dnl Check for usual libc functions
AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
AC_CHECK_FUNCS([daemon fcntl fdopendir fstatvfs fork getenv getpwuid_r if_nameindex if_nametoindex isatty lstat memalign mmap openat pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp uselocale])
AC_REPLACE_FUNCS([asprintf atof atoll dirfd flockfile fsync getdelim getpid gmtime_r lldiv localtime_r nrand48 rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy vasprintf])
AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r if_nameindex if_nametoindex isatty lstat memalign mmap openat pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp uselocale])
AC_REPLACE_FUNCS([asprintf atof atoll dirfd fdopendir flockfile fsync getdelim getpid gmtime_r lldiv localtime_r nrand48 rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy vasprintf])
AC_CHECK_FUNCS(fdatasync,,
[AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
])
......
......@@ -64,7 +64,8 @@ typedef struct
# include <sys/types.h> /* ssize_t, pid_t */
#endif
#ifndef HAVE_DIRFD
#if !defined (HAVE_DIRFD) || \
!defined (HAVE_FDOPENDIR)
# include <dirent.h>
#endif
......@@ -188,6 +189,10 @@ int fsync (int fd);
int dirfd (DIR *);
#endif
#ifndef HAVE_FDOPENDIR
DIR *fdopendir (int);
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
......
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