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,
  17                 int xioflags,   /* XIO_RDONLY etc. */
  18                 xiofile_t *fd,
  19                 unsigned groups,
  20                 int dummy1, int dummy2, int dummy3
  21                 );
  22
  23 const struct addrdesc addr_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>") };
  24
  25
  26 static int xioopen_system(int argc, const char *argv[], struct opt *opts,
  27                 int xioflags,   /* XIO_RDONLY etc. */
  28                 xiofile_t *fd,
  29                 unsigned groups,
  30                 int dummy1, int dummy2, int dummy3
  31                 ) {
  32    int status;
  33    char *path = NULL;
  34    int duptostderr;
  35    int result;
  36    const char *string = argv[1];
  37
  38    status = _xioopen_foxec(xioflags, &fd->stream, groups, &opts, &duptostderr);
  39    if (status < 0)  return status;
  40    if (status == 0) {   /* child */
  41       int numleft;
  42
  43       /* do not shutdown connections that belong our parent */
  44       sock[0] = NULL;
  45       sock[1] = NULL;
  46
  47       if (setopt_path(opts, &path) < 0) {
  48          /* this could be dangerous, so let us abort this child... */
  49          Exit(1);
  50       }
  51
  52       if ((numleft = leftopts(opts)) > 0) {
  53          Error1("%d option(s) could not be used", numleft);
  54          showleft(opts);
  55          return STAT_NORETRY;
  56       }
  57
  58       /* only now redirect stderr */
  59       if (duptostderr >= 0) {
  60          diag_dup();
  61          Dup2(duptostderr, 2);
  62       }
  63       Info1("executing shell command \"%s\"", string);
  64       errno=0;
  65       result = System(string);
  66       if (result != 0) {
  67          Warn2("system(\"%s\") returned with status %d", string, result);
  68          if (errno != 0)
  69             Warn1("system(): %s", strerror(errno));
  70       }
  71       Exit(result>>8);  /* this child process */
  72    }
  73
  74    /* parent */
  75    return 0;
  76 }
  77
  78 #endif /* WITH_SYSTEM */