glibc/sysdeps/unix/ifreq.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

80 lines
1.9 KiB
C

/* Copyright (C) 1999-2021 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, see
<https://www.gnu.org/licenses/>. */
#include "ifreq.h"
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;
rq_len = RQ_IFS * sizeof (struct ifreq) / 2; /* Doubled in the loop. */
do
{
ifc.ifc_len = rq_len *= 2;
void *newp = realloc (ifc.ifc_buf, ifc.ifc_len);
if (newp == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
{
free (ifc.ifc_buf);
if (fd != sockfd)
__close (fd);
*num_ifs = 0;
*ifreqs = NULL;
return;
}
ifc.ifc_buf = newp;
}
while (rq_len < sizeof (struct ifreq) + ifc.ifc_len);
if (fd != sockfd)
__close (fd);
#ifdef _HAVE_SA_LEN
struct ifreq *ifr = *ifreqs;
nifs = 0;
while ((char *) ifr < ifc.ifc_buf + ifc.ifc_len)
{
++nifs;
ifr = __if_nextreq (ifr);
if (ifr == NULL)
break;
}
#else
nifs = ifc.ifc_len / sizeof (struct ifreq);
#endif
*num_ifs = nifs;
*ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
}