glibc/sysdeps/unix/sysv/linux/ifreq.h
Roland McGrath fcdc67f963 * sysdeps/powerpc/bits/setjmp.h [__WORDSIZE]: Add 64-bit jmpbuf.
* sysdeps/powerpc/bits/wordsize.h: New file.
	* sysdeps/powerpc/fpu/bits/mathinline.h (lrint, lrintf): Change long
	array to int array for 32-/64-bit compatibility.

2002-09-20  Roland McGrath  <roland@redhat.com>

	* login/programs/utmpdump.c: Don't include <error.h>, <errno.h>.

	* sysdeps/generic/utimes.c (__utimes): Don't check TVP for null.
	Reported by Bruno Haible <bruno@clisp.org>.

	* sysdeps/generic/ifreq.h (__ifreq): Compute termination condition
	before doubling RQ_LEN.
	* sysdeps/unix/sysv/linux/ifreq.h (__ifreq): Likewise.
	Reported by Bruno Haible <bruno@clisp.org>.

2002-09-18  Bruno Haible  <bruno@clisp.org>

	* login/logout.c (logout): Don't assume ut_time has the same size as
	a time_t.
	* login/logwtmp.c (logwtmp): Likewise.

	* sysdeps/pthread/configure: New file, moved here from
	linuxthreads/sysdeps/unix/sysv/linux/configure.
2002-09-20 20:06:45 +00:00

113 lines
2.6 KiB
C

/* Copyright (C) 1999,2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>.
The GNU C Library 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.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include "kernel-features.h"
/* Variable to signal whether SIOCGIFCONF is not available. */
#if __ASSUME_SIOCGIFNAME == 0 || 1
static int old_siocgifconf;
#else
# define old_siocgifconf 0
#endif
static inline void
__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
{
int fd = sockfd;
struct ifconf ifc;
int rq_len;
int nifs;
# define RQ_IFS 4
if (fd < 0)
fd = __opensock ();
if (fd < 0)
{
*num_ifs = 0;
*ifreqs = NULL;
return;
}
ifc.ifc_buf = NULL;
/* We may be able to get the needed buffer size directly, rather than
guessing. */
if (! old_siocgifconf)
{
ifc.ifc_buf = NULL;
ifc.ifc_len = 0;
if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
{
# if __ASSUME_SIOCGIFNAME == 0
old_siocgifconf = 1;
# endif
rq_len = RQ_IFS * sizeof (struct ifreq);
}
else
rq_len = ifc.ifc_len;
}
else
rq_len = RQ_IFS * sizeof (struct ifreq);
/* Read all the interfaces out of the kernel. */
while (1)
{
ifc.ifc_len = rq_len;
ifc.ifc_buf = realloc (ifc.ifc_buf, ifc.ifc_len);
if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
{
if (ifc.ifc_buf)
free (ifc.ifc_buf);
if (fd != sockfd)
__close (fd);
*num_ifs = 0;
*ifreqs = NULL;
return;
}
if (!old_siocgifconf || ifc.ifc_len < rq_len)
break;
rq_len *= 2;
}
nifs = ifc.ifc_len / sizeof (struct ifreq);
if (fd != sockfd)
__close (fd);
*num_ifs = nifs;
*ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
}
static inline void
__if_freereq (struct ifreq *ifreqs, int num_ifs)
{
free (ifreqs);
}