mtimeout.1: Use correct dash for number ranges.

[misc] / if-mtu.c

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <sys/ioctl.h>

int main(int argc, char *argv[])
{
  int fd;
  struct ifreq ifr;
  if (argc != 2) {
    fprintf(stderr, "usage: %s IFACE\n", argv[0]);
    exit(1);
  }
  if (strlen(argv[1]) >= sizeof(ifr.ifr_name)) {
    fprintf(stderr, "%s: interface name `%s' too long\n", argv[0], argv[1]);
    exit(1);
  }
  if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    fprintf(stderr, "%s: socket: %s\n", argv[0], strerror(errno));
    exit(1);
  }
  strcpy(ifr.ifr_name, argv[1]);
  if (ioctl(fd, SIOCGIFMTU, &ifr)) {
    fprintf(stderr, "%s: ioctl(SIOCGIFMTU): %s\n", argv[0], strerror(errno));
    exit(1);
  }
  printf("%d\n", ifr.ifr_mtu);
  return (0);
}