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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [ifreq.c] - Rev 207
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/* Copyright (C) 1999, 2002, 2003, 2004 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 "ifreq.h" /* Variable to signal whether SIOCGIFCONF is not available. */ #if __ASSUME_SIOCGIFNAME == 0 || 1 static int old_siocgifconf; #else # define old_siocgifconf 0 #endif 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; void *newp = realloc (ifc.ifc_buf, ifc.ifc_len); if (newp == NULL || (ifc.ifc_buf = newp, ioctl (fd, SIOCGIFCONF, &ifc)) < 0) { 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)); }