libjava/classpath/native/jni/native-lib/cpproc.c

   1 /* cpproc.c -
   2    Copyright (C) 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 #include "config.h"
  39 #include <jni.h>
  40 #include "cpproc.h"
  41 #include <signal.h>
  42 #include <sys/types.h>
  43 #include <sys/wait.h>
  44 #include <unistd.h>
  45 #include <errno.h>
  46 #include <stdlib.h>
  47
  48 static void close_all_fds(int *fds, int numFds)
  49 {
  50   int i;
  51
  52   for (i = 0; i < numFds; i++)
  53     close(fds[i]);
  54 }
  55
  56 int cpproc_forkAndExec (char * const *commandLine, char * const * newEnviron,
  57                         int *fds, int pipe_count, pid_t *out_pid, const char *wd)
  58 {
  59   int local_fds[6];
  60   int i;
  61   pid_t pid;
  62
  63   for (i = 0; i < (pipe_count * 2); i += 2)
  64     {
  65       if (pipe(&local_fds[i]) < 0)
  66         {
  67           int err = errno;
  68
  69           close_all_fds(local_fds, i);
  70
  71           return err;
  72         }
  73     }
  74
  75   pid = fork();
  76
  77   switch (pid)
  78     {
  79     case 0:
  80       dup2(local_fds[0], 0);
  81       dup2(local_fds[3], 1);
  82       if (pipe_count == 3)
  83         dup2(local_fds[5], 2);
  84       else
  85         dup2(1, 2);
  86
  87       close_all_fds(local_fds, pipe_count * 2);
  88
  89       i = chdir(wd);
  90       /* FIXME: Handle the return value */
  91       if (newEnviron == NULL)
  92         execvp(commandLine[0], commandLine);
  93       else
  94         execve(commandLine[0], commandLine, newEnviron);
  95
  96       abort();
  97
  98       break;
  99     case -1:
 100       {
 101         int err = errno;
 102
 103         close_all_fds(local_fds, pipe_count * 2);
 104         return err;
 105       }
 106     default:
 107       close(local_fds[0]);
 108       close(local_fds[3]);
 109       if (pipe_count == 3)
 110         close(local_fds[5]);
 111
 112       fds[0] = local_fds[1];
 113       fds[1] = local_fds[2];
 114       fds[2] = local_fds[4];
 115       *out_pid = pid;
 116       return 0;
 117     }
 118
 119   /* keep compiler happy */
 120
 121   return 0;
 122 }
 123
 124 int cpproc_waitpid (pid_t pid, int *status, pid_t *outpid, int options)
 125 {
 126   pid_t wp = waitpid(pid, status, options);
 127
 128   if (wp < 0)
 129     return errno;
 130
 131   *outpid = wp;
 132   return 0;
 133 }
 134
 135 int cpproc_kill (pid_t pid, int signal)
 136 {
 137   if (kill(pid, signal) < 0)
 138     return errno;
 139
 140   return 0;
 141 }