Line data    Source code

       1             : /*
       2             :  *
       3             :  * Copyright 2015, Google Inc.
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions are
       8             :  * met:
       9             :  *
      10             :  *     * Redistributions of source code must retain the above copyright
      11             :  * notice, this list of conditions and the following disclaimer.
      12             :  *     * Redistributions in binary form must reproduce the above
      13             :  * copyright notice, this list of conditions and the following disclaimer
      14             :  * in the documentation and/or other materials provided with the
      15             :  * distribution.
      16             :  *     * Neither the name of Google Inc. nor the names of its
      17             :  * contributors may be used to endorse or promote products derived from
      18             :  * this software without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      21             :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      22             :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      23             :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      24             :  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      25             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      26             :  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      27             :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      28             :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      30             :  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      31             :  *
      32             :  */
      33             : 
      34             : #include <grpc/support/port_platform.h>
      35             : 
      36             : #ifdef GPR_POSIX_SUBPROCESS
      37             : 
      38             : #include <grpc/support/subprocess.h>
      39             : 
      40             : #include <unistd.h>
      41             : #include <assert.h>
      42             : #include <errno.h>
      43             : #include <stdio.h>
      44             : #include <string.h>
      45             : #include <signal.h>
      46             : #include <stdlib.h>
      47             : #include <sys/types.h>
      48             : #include <sys/wait.h>
      49             : 
      50             : #include <grpc/support/alloc.h>
      51             : #include <grpc/support/log.h>
      52             : 
      53             : struct gpr_subprocess {
      54             :   int pid;
      55             :   int joined;
      56             : };
      57             : 
      58           2 : const char *gpr_subprocess_binary_extension() { return ""; }
      59             : 
      60          12 : gpr_subprocess *gpr_subprocess_create(int argc, const char **argv) {
      61             :   gpr_subprocess *r;
      62             :   int pid;
      63             :   char **exec_args;
      64             : 
      65          12 :   pid = fork();
      66          12 :   if (pid == -1) {
      67           0 :     return NULL;
      68          12 :   } else if (pid == 0) {
      69           0 :     exec_args = gpr_malloc(((size_t)argc + 1) * sizeof(char *));
      70           0 :     memcpy(exec_args, argv, (size_t)argc * sizeof(char *));
      71           0 :     exec_args[argc] = NULL;
      72           0 :     execv(exec_args[0], exec_args);
      73             :     /* if we reach here, an error has occurred */
      74           0 :     gpr_log(GPR_ERROR, "execv '%s' failed: %s", exec_args[0], strerror(errno));
      75           0 :     _exit(1);
      76             :     return NULL;
      77             :   } else {
      78          12 :     r = gpr_malloc(sizeof(gpr_subprocess));
      79          12 :     memset(r, 0, sizeof(*r));
      80          12 :     r->pid = pid;
      81          12 :     return r;
      82             :   }
      83             : }
      84             : 
      85          12 : void gpr_subprocess_destroy(gpr_subprocess *p) {
      86          12 :   if (!p->joined) {
      87          12 :     kill(p->pid, SIGKILL);
      88          12 :     gpr_subprocess_join(p);
      89             :   }
      90          12 :   gpr_free(p);
      91          12 : }
      92             : 
      93          14 : int gpr_subprocess_join(gpr_subprocess *p) {
      94             :   int status;
      95             : retry:
      96          14 :   if (waitpid(p->pid, &status, 0) == -1) {
      97           2 :     if (errno == EINTR) {
      98           0 :       goto retry;
      99             :     }
     100           2 :     gpr_log(GPR_ERROR, "waitpid failed: %s", strerror(errno));
     101           2 :     return -1;
     102             :   }
     103          12 :   return status;
     104             : }
     105             : 
     106           1 : void gpr_subprocess_interrupt(gpr_subprocess *p) {
     107           1 :   if (!p->joined) {
     108           1 :     kill(p->pid, SIGINT);
     109             :   }
     110           1 : }
     111             : 
     112             : #endif /* GPR_POSIX_SUBPROCESS */