24 lines
509 B
C
24 lines
509 B
C
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#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 <errno.h>
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#include "syscall.h"
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char *if_indextoname(unsigned index, 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 0;
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ifr.ifr_ifindex = index;
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r = ioctl(fd, SIOCGIFNAME, &ifr);
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__syscall(SYS_close, fd);
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if (r < 0) {
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if (errno == ENODEV) errno = ENXIO;
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return 0;
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}
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return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
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}
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