root/maint/gnulib/tests/test-nonblocking-pipe-main.c

/* */

DEFINITIONS

1. main

   1 /* Test for nonblocking read and write on pipes.
   2 
   3    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   4 
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9 
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14 
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17 
  18 #include <config.h>
  19 
  20 #include <errno.h>
  21 #include <stdbool.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/time.h>
  26 
  27 #if defined _WIN32 && ! defined __CYGWIN__
  28 # include <process.h>
  29 #else
  30 # include <spawn.h>
  31 #endif
  32 
  33 #include "nonblocking.h"
  34 #include "wait-process.h"
  35 
  36 #include "macros.h"
  37 #include "test-nonblocking-pipe.h"
  38 #define PROG_ROLE "main"
  39 #include "test-nonblocking-writer.h"
  40 
  41 int
  42 main (int argc, char *argv[])
     /*  */
  43 {
  44   const char *child_path;
  45   int test;
  46   int fd[2];
  47   pid_t child;
  48   int exitcode;
  49 
  50   child_path = argv[1];
  51   test = atoi (argv[2]);
  52 
  53   /* Create a pipe.  */
  54   ASSERT (pipe (fd) >= 0);
  55 
  56   /* Map fd[0] to STDIN_FILENO and fd[1] to STDOUT_FILENO, because on Windows,
  57      the only three file descriptors that are inherited by child processes are
  58      STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO.  */
  59   if (fd[0] != STDIN_FILENO)
  60     {
  61       ASSERT (dup2 (fd[0], STDIN_FILENO) >= 0);
  62       close (fd[0]);
  63     }
  64   if (fd[1] != STDOUT_FILENO)
  65     {
  66       ASSERT (dup2 (fd[1], STDOUT_FILENO) >= 0);
  67       close (fd[1]);
  68     }
  69 
  70   /* Prepare the file descriptors.  */
  71   if (test & 1)
  72     ASSERT (set_nonblocking_flag (STDOUT_FILENO, true) >= 0);
  73   if (test & 2)
  74     ASSERT (set_nonblocking_flag (STDIN_FILENO, true) >= 0);
  75 
  76   /* Spawn the child process.  */
  77   {
  78     const char *child_argv[3];
  79 
  80     child_argv[0] = child_path;
  81     child_argv[1] = argv[2];
  82     child_argv[2] = NULL;
  83 
  84 #if defined _WIN32 && ! defined __CYGWIN__
  85     child = _spawnvpe (P_NOWAIT, child_path, child_argv,
  86                        (const char **) environ);
  87     ASSERT (child >= 0);
  88 #else
  89     {
  90       pid_t child_pid;
  91       int err =
  92         posix_spawnp (&child_pid, child_path, NULL, NULL, (char **) child_argv,
  93                       environ);
  94       ASSERT (err == 0);
  95       child = child_pid;
  96     }
  97 #endif
  98   }
  99 
 100   /* Close unused file descriptors.  */
 101   close (STDIN_FILENO);
 102 
 103   exitcode =
 104     main_writer_loop (test, PIPE_DATA_BLOCK_SIZE, STDOUT_FILENO, false);
 105 
 106   {
 107     int err =
 108       wait_subprocess (child, child_path, false, false, false, false, NULL);
 109     ASSERT (err == 0);
 110   }
 111 
 112   return exitcode;
 113 }

/* */