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18 lines
430 B
18 lines
430 B
#define _GNU_SOURCE
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#include <net/if.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <string.h>
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#include "syscall.h"
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unsigned if_nametoindex(const char *name)
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{
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struct ifreq ifr;
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int fd, r;
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if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return -1;
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strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
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r = ioctl(fd, SIOCGIFINDEX, &ifr);
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__syscall(SYS_close, fd);
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return r < 0 ? r : ifr.ifr_ifindex;
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}
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