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(if_nameindex): Use extend_alloca.

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This commit is contained in:
Ulrich Drepper 2004-06-29 02:48:21 +00:00
parent e1be0bc565
commit de7b50f413
1 changed files with 10 additions and 5 deletions
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15
sysdeps/unix/sysv/linux/if_index.c
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@ -16,6 +16,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */ 02111-1307 USA. */
#include <alloca.h>
#include <errno.h> #include <errno.h>
#include <string.h> #include <string.h>
#include <stdio.h> #include <stdio.h>
@ -118,17 +119,21 @@ if_nameindex (void)
rq_len = RQ_IFS * sizeof (struct ifreq); rq_len = RQ_IFS * sizeof (struct ifreq);
/* Read all the interfaces out of the kernel. */ /* 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); close_not_cancel_no_status (fd);
return NULL; 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); nifs = ifc.ifc_len / sizeof (struct ifreq);