srvfs.c 1.5 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384
  1. #include <u.h>
  2. #include <libc.h>
  3. static void
  4. usage(void)
  5. {
  6. fprint(2, "usage: %s [-dS] [-e exportfs] [-p perm] srvname path\n", argv0);
  7. exits("usage");
  8. }
  9. void
  10. main(int argc, char **argv)
  11. {
  12. char *ename, *arglist[16], **argp;
  13. int n, fd, pipefd[2];
  14. char buf[64];
  15. int perm = 0600;
  16. argp = arglist;
  17. ename = "/bin/exportfs";
  18. *argp++ = "exportfs";
  19. ARGBEGIN{
  20. default:
  21. usage();
  22. case 'd':
  23. *argp++ = "-d";
  24. break;
  25. case 'e':
  26. ename = ARGF();
  27. break;
  28. case 'p':
  29. perm = strtol(ARGF(), 0, 8);
  30. break;
  31. }ARGEND
  32. *argp = 0;
  33. if(argc != 2)
  34. usage();
  35. if(pipe(pipefd) < 0){
  36. fprint(2, "can't pipe: %r\n");
  37. exits("pipe");
  38. }
  39. switch(rfork(RFPROC|RFNOWAIT|RFNOTEG|RFFDG)){
  40. case -1:
  41. fprint(2, "can't rfork: %r\n");
  42. exits("rfork");
  43. case 0:
  44. dup(pipefd[0], 0);
  45. dup(pipefd[0], 1);
  46. close(pipefd[0]);
  47. close(pipefd[1]);
  48. exec(ename, arglist);
  49. fprint(2, "can't exec exportfs: %r\n");
  50. exits("exec");
  51. default:
  52. break;
  53. }
  54. close(pipefd[0]);
  55. if(fprint(pipefd[1], "%s", argv[1]) < 0){
  56. fprint(2, "can't write pipe: %r\n");
  57. exits("write");
  58. }
  59. n = read(pipefd[1], buf, sizeof buf-1);
  60. if(n < 0){
  61. fprint(2, "can't read pipe: %r\n");
  62. exits("read");
  63. }
  64. buf[n] = 0;
  65. if(n != 2 || strcmp(buf, "OK") != 0){
  66. fprint(2, "not OK (%d): %s\n", n, buf);
  67. exits("OK");
  68. }
  69. sprint(buf, "/srv/%s", argv[0]);
  70. fd = create(buf, OWRITE, perm);
  71. if(fd < 0){
  72. fprint(2, "can't create %s: %r\n", buf);
  73. exits("create");
  74. }
  75. fprint(fd, "%d", pipefd[1]);
  76. close(fd);
  77. close(pipefd[1]);
  78. exits(0);
  79. }