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(if_nameindex): Use extend_alloca.
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e1be0bc565
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@ -16,6 +16,7 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <alloca.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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@ -118,17 +119,21 @@ if_nameindex (void)
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rq_len = RQ_IFS * sizeof (struct ifreq);
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/* Read all the interfaces out of the kernel. */
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do
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ifc.ifc_buf = alloca (rq_len);
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ifc.ifc_len = rq_len;
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while (1)
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{
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ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
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if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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{
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close_not_cancel_no_status (fd);
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return NULL;
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}
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rq_len *= 2;
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if (ifc.ifc_len < rq_len || ! old_siocgifconf)
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break;
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ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len);
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ifc.ifc_len = rq_len;
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}
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while (ifc.ifc_len == rq_len && old_siocgifconf);
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nifs = ifc.ifc_len / sizeof (struct ifreq);
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