1234567891011121314151617181920212223 |
- #define _GNU_SOURCE
- #include <net/if.h>
- #include <sys/socket.h>
- #include <sys/ioctl.h>
- #include <string.h>
- #include <errno.h>
- #include "syscall.h"
- char *if_indextoname(unsigned index, char *name)
- {
- struct ifreq ifr;
- int fd, r;
- if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
- ifr.ifr_ifindex = index;
- r = ioctl(fd, SIOCGIFNAME, &ifr);
- __syscall(SYS_close, fd);
- if (r < 0) {
- if (errno == ENODEV) errno = ENXIO;
- return 0;
- }
- return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
- }
|