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-rw-r--r--libc/inet/if_index.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/libc/inet/if_index.c b/libc/inet/if_index.c
index 5837faa65..abfb26e00 100644
--- a/libc/inet/if_index.c
+++ b/libc/inet/if_index.c
@@ -101,21 +101,19 @@ if_nameindex (void)
rq_len = RQ_IFS * sizeof (struct ifreq);
/* Read all the interfaces out of the kernel. */
- ifc.ifc_buf = alloca (rq_len);
- ifc.ifc_len = rq_len;
- while (1)
+ /* Note: alloca's in this loop are diff from glibc because it's smaller */
+ do
{
+ ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len);
+ ifc.ifc_len = rq_len;
+
if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
{
__close (fd);
return NULL;
}
- if (ifc.ifc_len < rq_len)
- 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);
nifs = ifc.ifc_len / sizeof(struct ifreq);