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authorUlrich Drepper <drepper@redhat.com>2004-06-29 02:48:21 +0000
committerUlrich Drepper <drepper@redhat.com>2004-06-29 02:48:21 +0000
commitde7b50f41386cdbe7ce2b0b5833d57965fd2c641 (patch)
treec391531fdcbaaa4d3314d37bb2dfd56e563d46a4 /sysdeps/unix
parente1be0bc5657984906bb6885623d348914e135223 (diff)
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(if_nameindex): Use extend_alloca.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/if_index.c15
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);