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* nss/nss_files/files-XXX.c (internal_setent): Use O_CLOEXEC if

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possible.
	* nss/nss_files/files-alias.c (internal_setent): Likewise.
	* nss/Makefile (libnss_files-routines): Add files-have_o_cloexec.
	* nss/nss_files/files-have_o_cloexec.c: New file.
This commit is contained in:
Ulrich Drepper
2007-08-10 23:41:40 +00:00
parent 916ee8bcba
commit aa132749c8
5 changed files with 101 additions and 36 deletions
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51
nss/nss_files/files-alias.c
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@@ -1,5 +1,5 @@
/* Mail alias file parser in nss_files module.
Copyright (C) 1996,97,98,99,2002,2006 Free Software Foundation, Inc.
Copyright (C) 1996,97,98,99,2002,2006,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -27,6 +27,8 @@
#include <stdio.h>
#include <string.h>
#include <kernel-features.h>
#include "nsswitch.h"
/* Locks the static variables in this file. */
@@ -46,29 +48,44 @@ internal_setent (void)
if (stream == NULL)
{
stream = fopen ("/etc/aliases", "r");
stream = fopen ("/etc/aliases", "re");
if (stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result, flags;
#if !defined O_CLOEXEC || !defined __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* We have to make sure the file is `closed on exec'. */
int result;
int flags;
result = flags = fcntl (fileno (stream), F_GETFD, 0);
if (result >= 0)
{
flags |= FD_CLOEXEC;
result = fcntl (fileno (stream), F_SETFD, flags);
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
result = flags = fcntl (fileno (stream), F_GETFD, 0);
if (result >= 0)
{
# ifdef O_CLOEXEC
if (__have_o_cloexec == 0)
__have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1;
if (__have_o_cloexec < 0)
# endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno (stream), F_SETFD, flags);
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
#endif
}
}
else