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authorRich Felker <dalias@aerifal.cx>2011-04-05 13:20:08 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-05 13:20:08 -0400
commit92b2eb8d0331abcf7afbddeca80ebdcf136d8b3d (patch)
tree6b5a787b564328033b614decbcd4a17f3562346a /src/network/if_nametoindex.c
parentef8b4b1aa68608d7dc65cad41f19b85ec0d3e7af (diff)
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implement if_indextoname and if_nametoindex functions
Diffstat (limited to 'src/network/if_nametoindex.c')
-rw-r--r--src/network/if_nametoindex.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/network/if_nametoindex.c b/src/network/if_nametoindex.c
new file mode 100644
index 00000000..419931f9
--- /dev/null
+++ b/src/network/if_nametoindex.c
@@ -0,0 +1,18 @@
+#define _GNU_SOURCE
+#include <net/if.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <string.h>
+#include "syscall.h"
+
+unsigned if_nametoindex(const char *name)
+{
+ struct ifreq ifr;
+ int fd, r;
+
+ if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return -1;
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ r = ioctl(fd, SIOCGIFINDEX, &ifr);
+ __syscall(SYS_close, fd);
+ return r < 0 ? r : ifr.ifr_ifindex;
+}