sys/src/cmd/srvfs.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 static void
   5 usage(void)
   6 {
   7         fprint(2, "usage: %s [-dR] [-p perm] [-P patternfile] [-e exportfs] srvname path\n", argv0);
   8         exits("usage");
   9 }
  10
  11 void
  12 main(int argc, char **argv)
  13 {
  14         char *ename, *arglist[16], **argp;
  15         int n, fd, pipefd[2];
  16         char buf[64];
  17         int perm = 0600;
  18
  19         argp = arglist;
  20         ename = "/bin/exportfs";
  21         *argp++ = "exportfs";
  22         ARGBEGIN{
  23         default:
  24                 usage();
  25         case 'd':
  26                 *argp++ = "-d";
  27                 break;
  28         case 'e':
  29                 ename = EARGF(usage());
  30                 break;
  31         case 'p':
  32                 perm = strtol(EARGF(usage()), 0, 8);
  33                 break;
  34         case 'P':
  35                 *argp++ = "-P";
  36                 *argp++ = EARGF(usage());
  37                 break;
  38         case 'R':
  39                 *argp++ = "-R";
  40                  break;
  41         }ARGEND
  42         *argp = 0;
  43         if(argc != 2)
  44                 usage();
  45
  46         if(pipe(pipefd) < 0){
  47                 fprint(2, "can't pipe: %r\n");
  48                 exits("pipe");
  49         }
  50
  51         switch(rfork(RFPROC|RFNOWAIT|RFNOTEG|RFFDG)){
  52         case -1:
  53                 fprint(2, "can't rfork: %r\n");
  54                 exits("rfork");
  55         case 0:
  56                 dup(pipefd[0], 0);
  57                 dup(pipefd[0], 1);
  58                 close(pipefd[0]);
  59                 close(pipefd[1]);
  60                 exec(ename, arglist);
  61                 fprint(2, "can't exec exportfs: %r\n");
  62                 exits("exec");
  63         default:
  64                 break;
  65         }
  66         close(pipefd[0]);
  67         if(fprint(pipefd[1], "%s", argv[1]) < 0){
  68                 fprint(2, "can't write pipe: %r\n");
  69                 exits("write");
  70         }
  71         n = read(pipefd[1], buf, sizeof buf-1);
  72         if(n < 0){
  73                 fprint(2, "can't read pipe: %r\n");
  74                 exits("read");
  75         }
  76         buf[n] = 0;
  77         if(n != 2 || strcmp(buf, "OK") != 0){
  78                 fprint(2, "not OK (%d): %s\n", n, buf);
  79                 exits("OK");
  80         }
  81         if(argv[0][0] == '/')
  82                 strecpy(buf, buf+sizeof buf, argv[0]);
  83         else
  84                 snprint(buf, sizeof buf, "/srv/%s", argv[0]);
  85         fd = create(buf, OWRITE, perm);
  86         if(fd < 0){
  87                 fprint(2, "can't create %s: %r\n", buf);
  88                 exits("create");
  89         }
  90         fprint(fd, "%d", pipefd[1]);
  91         close(fd);
  92         close(pipefd[1]);
  93         exits(0);
  94 }