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author | Ulrich Drepper <drepper@redhat.com> | 1999-10-30 16:13:07 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 1999-10-30 16:13:07 +0000 |
commit | 0c34b1e9b5f8cf667dd287be2c25cd2e1a2cff7c (patch) | |
tree | afe1088133a5a9b2fcd02aab6579a150abc7b484 /sysdeps/unix/sysv/linux | |
parent | aaa1276ee31ca872190cd097c7b4d845996fed39 (diff) | |
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Update.
1999-10-30 Ulrich Drepper <drepper@cygnus.com>
* manual/time.texi (Formatting Date and Time): Revise comments about
origins of the formats with ISO C99 references.
1999-10-30 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/ifreq.h: New file.
1999-10-29 Andreas Jaeger <aj@suse.de>
* manual/arith.texi (Parsing of Floats): Document the hexadecimal
input format; mention that strtof and strtold are part of ISO C99.
Diffstat (limited to 'sysdeps/unix/sysv/linux')
-rw-r--r-- | sysdeps/unix/sysv/linux/ifreq.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ifreq.h b/sysdeps/unix/sysv/linux/ifreq.h new file mode 100644 index 0000000000..8c9000551d --- /dev/null +++ b/sysdeps/unix/sysv/linux/ifreq.h @@ -0,0 +1,103 @@ +/* Copyright (C) 1999 Free Software Foundation, Inc. + 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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 +static int old_siocgifconf; +#else +# define old_siocgifconf 0 +#endif + + +static inline void +__ifreq (struct ifreq **ifreqs, int *num_ifs) +{ + int fd = __opensock (); + struct ifconf ifc; + int rq_len; + int nifs; +# define RQ_IFS 4 + + 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. */ + do + { + 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); + + __close (fd); + + *num_ifs = 0; + *ifreqs = NULL; + return; + } + rq_len *= 2; + } + while (ifc.ifc_len == rq_len && old_siocgifconf); + + nifs = ifc.ifc_len / sizeof (struct ifreq); + __close (fd); + + *num_ifs = nifs; + *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq)); +} + +static inline void +__if_freereq (struct ifreq *ifreqs) +{ + free (ifreqs); +} |