xio-system.c

   1 /* source: xio-system.c */
   2 /* Copyright Gerhard Rieger and contributors (see file CHANGES) */
   3 /* Published under the GNU General Public License V.2, see file COPYING */
   4
   5 /* this file contains the source for opening addresses of system type */
   6
   7 #include "xiosysincludes.h"
   8 #include "xioopen.h"
   9
  10 #include "xio-progcall.h"
  11 #include "xio-system.h"
  12
  13
  14 #if WITH_SYSTEM
  15
  16 static int xioopen_system(int arg, const char *argv[], struct opt *opts, int xioflags, xiofile_t *xfd, const struct addrdesc *addrdesc);
  17
  18 const struct addrdesc xioaddr_system = { "SYSTEM", 3, xioopen_system, GROUP_FD|GROUP_FORK|GROUP_EXEC|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_TERMIOS|GROUP_FIFO|GROUP_PTY|GROUP_PARENT, 1, 0, 0 HELP(":<shell-command>") };
  19
  20
  21 static int xioopen_system(
  22         int argc,
  23         const char *argv[],
  24         struct opt *opts,
  25         int xioflags,   /* XIO_RDONLY etc. */
  26         xiofile_t *xfd,
  27         const struct addrdesc *addrdesc)
  28 {
  29    struct single *sfd = &xfd->stream;
  30    int status;
  31    char *path = NULL;
  32    int duptostderr;
  33    int result;
  34    const char *string = argv[1];
  35
  36    if (argc != 2) {
  37       xio_syntax(argv[0], 1, argc-1, addrdesc->syntax);
  38       return STAT_NORETRY;
  39    }
  40
  41    status =
  42       _xioopen_foxec(xioflags, sfd, addrdesc->groups, &opts, &duptostderr);
  43    if (status < 0)
  44       return status;
  45    if (status == 0) {   /* child */
  46       int numleft;
  47
  48       /* do not shutdown connections that belong our parent */
  49       sock[0] = NULL;
  50       sock[1] = NULL;
  51
  52       if (setopt_path(opts, &path) < 0) {
  53          /* this could be dangerous, so let us abort this child... */
  54          Exit(1);
  55       }
  56
  57       if ((numleft = leftopts(opts)) > 0) {
  58          showleft(opts);
  59          Error1("INTERNAL: %d option(s) remained unused", numleft);
  60          return STAT_NORETRY;
  61       }
  62
  63       /* only now redirect stderr */
  64       if (duptostderr >= 0) {
  65          diag_dup();
  66          Dup2(duptostderr, 2);
  67       }
  68       Info1("executing shell command \"%s\"", string);
  69       errno=0;
  70       result = System(string);
  71       if (result != 0) {
  72          Warn2("system(\"%s\") returned with status %d", string, result);
  73          if (errno != 0)
  74             Warn1("system(): %s", strerror(errno));
  75       }
  76       Exit(result>>8);  /* this child process */
  77    }
  78
  79    /* parent */
  80    _xio_openlate(sfd, opts);
  81    return 0;
  82 }
  83
  84 #endif /* WITH_SYSTEM */