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| author | Ulrich Drepper <drepper@redhat.com> | 2004-06-29 02:48:21 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-06-29 02:48:21 +0000 |
| commit | de7b50f41386cdbe7ce2b0b5833d57965fd2c641 (patch) | |
| tree | c391531fdcbaaa4d3314d37bb2dfd56e563d46a4 /sysdeps/unix/sysv/linux/if_index.c | |
| parent | e1be0bc5657984906bb6885623d348914e135223 (diff) | |
| download | glibc-de7b50f41386cdbe7ce2b0b5833d57965fd2c641.tar.gz glibc-de7b50f41386cdbe7ce2b0b5833d57965fd2c641.tar.xz glibc-de7b50f41386cdbe7ce2b0b5833d57965fd2c641.zip | |
(if_nameindex): Use extend_alloca.
Diffstat (limited to 'sysdeps/unix/sysv/linux/if_index.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/if_index.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c index 76349bd96d..92fb11b180 100644 --- a/sysdeps/unix/sysv/linux/if_index.c +++ b/sysdeps/unix/sysv/linux/if_index.c @@ -16,6 +16,7 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <alloca.h> #include <errno.h> #include <string.h> #include <stdio.h> @@ -118,17 +119,21 @@ if_nameindex (void) rq_len = RQ_IFS * sizeof (struct ifreq); /* Read all the interfaces out of the kernel. */ - do + ifc.ifc_buf = alloca (rq_len); + ifc.ifc_len = rq_len; + while (1) { - ifc.ifc_buf = alloca (ifc.ifc_len = rq_len); - if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0) + if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0) { close_not_cancel_no_status (fd); return NULL; } - rq_len *= 2; + if (ifc.ifc_len < rq_len || ! old_siocgifconf) + break; + + ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len); + ifc.ifc_len = rq_len; } - while (ifc.ifc_len == rq_len && old_siocgifconf); nifs = ifc.ifc_len / sizeof (struct ifreq); |