lib/ip/gethostname.c

   1 /* gethostname(2) system call emulation */
   2
   3 #include <sys/types.h>
   4 #include <fcntl.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <net/gen/netdb.h>
   9
  10 #define HOSTNAME_FILE "/etc/hostname.file"
  11
  12 int gethostname(char *buf, size_t len)
  13 {
  14         int fd;
  15         int r;
  16         char *nl;
  17
  18         if ((fd= open(HOSTNAME_FILE, O_RDONLY)) < 0) return -1;
  19
  20         r= read(fd, buf, len);
  21         close(fd);
  22         if (r == -1) return -1;
  23
  24         buf[len-1]= '\0';
  25         if ((nl= strchr(buf, '\n')) != NULL) *nl= '\0';
  26         return 0;
  27 }