git.maemo.org Git - busybox4maemo/blob - archival/libunarchive/open_transformer.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   4  */
   5
   6 #include "libbb.h"
   7 #include "unarchive.h"
   8
   9 /* transformer(), more than meets the eye */
  10 /*
  11  * On MMU machine, the transform_prog is removed by macro magic
  12  * in include/unarchive.h. On NOMMU, transformer is removed.
  13  */
  14 int open_transformer(int src_fd,
  15         USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
  16         const char *transform_prog)
  17 {
  18         struct fd_pair fd_pipe;
  19         int pid;
  20
  21         xpiped_pair(fd_pipe);
  22
  23 #if BB_MMU
  24         pid = fork();
  25 #else
  26         pid = vfork();
  27 #endif
  28         if (pid == -1)
  29                 bb_perror_msg_and_die("fork failed");
  30
  31         if (pid == 0) {
  32                 /* child process */
  33                 close(fd_pipe.rd); /* We don't want to read from the parent */
  34                 // FIXME: error check?
  35 #if BB_MMU
  36                 transformer(src_fd, fd_pipe.wr);
  37                 if (ENABLE_FEATURE_CLEAN_UP) {
  38                         close(fd_pipe.wr); /* Send EOF */
  39                         close(src_fd);
  40                 }
  41                 exit(0);
  42 #else
  43                 {
  44                         char *argv[4];
  45                         xmove_fd(src_fd, 0);
  46                         xmove_fd(fd_pipe.wr, 1);
  47                         argv[0] = (char*)transform_prog;
  48                         argv[1] = (char*)"-cf";
  49                         argv[2] = (char*)"-";
  50                         argv[3] = NULL;
  51                         BB_EXECVP(transform_prog, argv);
  52                         bb_perror_msg_and_die("exec failed");
  53                 }
  54 #endif
  55                 /* notreached */
  56         }
  57
  58         /* parent process */
  59         close(fd_pipe.wr); /* Don't want to write to the child */
  60
  61         return fd_pipe.rd;
  62 }