lib/libc/gen/minix/gethostname.c

   1 /* gethostname(2) system call emulation */
   2 #include <sys/cdefs.h>
   3 #include "namespace.h"
   4
   5 #include <sys/types.h>
   6 #include <fcntl.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10
  11 #ifdef __weak_alias
  12 __weak_alias(gethostname, _gethostname)
  13 #endif
  14
  15 #define HOSTNAME_FILE "/etc/hostname.file"
  16
  17 int gethostname(char *buf, size_t len)
  18 {
  19         int fd;
  20         int r;
  21         char *nl;
  22
  23         if ((fd= open(HOSTNAME_FILE, O_RDONLY)) < 0) return -1;
  24
  25         r= read(fd, buf, len);
  26         close(fd);
  27         if (r == -1) return -1;
  28
  29         buf[len-1]= '\0';
  30         if ((nl= strchr(buf, '\n')) != NULL) *nl= '\0';
  31         return 0;
  32 }