tests/test-nonblocking-pipe-main.c

   1 /* Test for nonblocking read and write on pipes.
   2
   3    Copyright (C) 2011-2025 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 <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/time.h>
  25
  26 #if defined _WIN32 && ! defined __CYGWIN__
  27 # include <process.h>
  28 #else
  29 # include <spawn.h>
  30 #endif
  31
  32 #include "nonblocking.h"
  33 #include "wait-process.h"
  34
  35 #include "macros.h"
  36 #include "test-nonblocking-pipe.h"
  37 #define PROG_ROLE "main"
  38 #include "test-nonblocking-writer.h"
  39
  40 int
  41 main (int argc, char *argv[])
  42 {
  43   const char *child_path;
  44   int test;
  45   int fd[2];
  46   pid_t child;
  47   int exitcode;
  48
  49   child_path = argv[1];
  50   test = atoi (argv[2]);
  51
  52   /* Create a pipe.  */
  53   ASSERT (pipe (fd) >= 0);
  54
  55   /* Map fd[0] to STDIN_FILENO and fd[1] to STDOUT_FILENO, because on Windows,
  56      the only three file descriptors that are inherited by child processes are
  57      STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO.  */
  58   if (fd[0] != STDIN_FILENO)
  59     {
  60       ASSERT (dup2 (fd[0], STDIN_FILENO) >= 0);
  61       close (fd[0]);
  62     }
  63   if (fd[1] != STDOUT_FILENO)
  64     {
  65       ASSERT (dup2 (fd[1], STDOUT_FILENO) >= 0);
  66       close (fd[1]);
  67     }
  68
  69   /* Prepare the file descriptors.  */
  70   if (test & 1)
  71     ASSERT (set_nonblocking_flag (STDOUT_FILENO, true) >= 0);
  72   if (test & 2)
  73     ASSERT (set_nonblocking_flag (STDIN_FILENO, true) >= 0);
  74
  75   /* Spawn the child process.  */
  76   {
  77     const char *child_argv[3];
  78
  79     child_argv[0] = child_path;
  80     child_argv[1] = argv[2];
  81     child_argv[2] = NULL;
  82
  83 #if defined _WIN32 && ! defined __CYGWIN__
  84     child = _spawnvpe (P_NOWAIT, child_path, child_argv,
  85                        (const char **) environ);
  86     ASSERT (child >= 0);
  87 #else
  88     {
  89       pid_t child_pid;
  90       int err =
  91         posix_spawnp (&child_pid, child_path, NULL, NULL, (char **) child_argv,
  92                       environ);
  93       ASSERT (err == 0);
  94       child = child_pid;
  95     }
  96 #endif
  97   }
  98
  99   /* Close unused file descriptors.  */
 100   close (STDIN_FILENO);
 101
 102   exitcode =
 103     main_writer_loop (test, PIPE_DATA_BLOCK_SIZE, STDOUT_FILENO, false);
 104
 105   {
 106     int err =
 107       wait_subprocess (child, child_path, false, false, false, false, NULL);
 108     ASSERT (err == 0);
 109   }
 110
 111   return (exitcode ? exitcode : test_exit_status);
 112 }