[22173] | 1 | /**********************************************************************
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| 2 | *
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| 3 | * os_process_unix.cpp -- Unix version of osprocess. See os_process.h
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| 4 | * for more details
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| 5 | *
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| 6 | * Copyright (C) 2010 The New Zealand Digital Library Project
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| 7 | *
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| 8 | * A component of the Greenstone digital library software
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| 9 | * from the New Zealand Digital Library Project at the
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| 10 | * University of Waikato, New Zealand.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or modify
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| 13 | * it under the terms of the GNU General Public License as published by
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| 14 | * the Free Software Foundation; either version 2 of the License, or
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| 15 | * (at your option) any later version.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful,
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| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | * GNU General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, write to the Free Software
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| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | *
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| 26 | *********************************************************************/
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| 27 |
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| 28 | #ifndef __WIN32__ // i.e Unix
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| 29 |
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| 30 | #if defined(GSDL_USE_OBJECTSPACE)
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| 31 | # include <ospace/std/iostream>
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| 32 | #elif defined(GSDL_USE_IOS_H)
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| 33 | # include <iostream.h>
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| 34 | #else
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| 35 | # include <iostream>
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| 36 | using namespace std;
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| 37 | #endif
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| 38 |
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| 39 | #include <unistd.h>
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[22183] | 40 | #include <sys/wait.h>
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[22173] | 41 |
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| 42 | #include "os_process_unix.h"
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| 43 |
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[22183] | 44 | osprocessunix::osprocessunix(OSProcessPipeMode mode,
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| 45 | char* prog_name, char* argv[], char* envp[])
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[22174] | 46 | : child_stdout_read_(-1), child_stdin_write_(-1),
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[22183] | 47 | osprocess(mode,prog_name,argv,envp)
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[22173] | 48 | {
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| 49 |
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| 50 | // Create a pipe for the child process's STDOUT.
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| 51 | int stdout_pipe_fd[2];
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| 52 |
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| 53 | if (pipe(stdout_pipe_fd)!=0) {
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| 54 | cerr << "osprocessunix::osprocessunix(): Failed to create stdout pipe for child process" << endl;
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| 55 | return;
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| 56 | }
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| 57 |
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| 58 | child_stdout_read_ = stdout_pipe_fd[READ_PIPE_INDEX];
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| 59 | int child_stdout_write = stdout_pipe_fd[WRITE_PIPE_INDEX];
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| 60 |
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| 61 |
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| 62 | // Create a pipe for the child process's STDIN.
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| 63 | int stdin_pipe_fd[2];
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| 64 |
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| 65 | if (pipe(stdin_pipe_fd)!=0) {
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| 66 | cerr << "osprocessunix::osprocessunix(): Failed to create stdin pipe for child process" << endl;
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| 67 | return;
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| 68 | }
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| 69 |
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| 70 | int child_stdin_read = stdin_pipe_fd[READ_PIPE_INDEX];
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| 71 | child_stdin_write_ = stdin_pipe_fd[WRITE_PIPE_INDEX];
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| 72 |
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| 73 |
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[22177] | 74 | pid_ = fork();
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| 75 | if (pid_ < 0) {
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[22173] | 76 | cerr << "osprocessunix::osprocessunix(): Failed to create child process" << endl;
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| 77 | return;
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| 78 | }
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| 79 |
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[22177] | 80 | if (pid_ == 0) {
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[22173] | 81 | // Child process
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| 82 |
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| 83 | // Sort out input pipe
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| 84 | // child has no buisness accessing write end of input pipe => close
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[22177] | 85 | ::close(child_stdin_write_);
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| 86 | child_stdin_write_=-1;
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[22173] | 87 |
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| 88 | if ((mode == uniWrite) || (mode == biReadWrite)) {
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| 89 | // wire up child's stdin read so its input comes from the parent's pipe
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| 90 | dup2(child_stdin_read, FD_STDIN);
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| 91 | }
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| 92 | else {
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[22177] | 93 | // Parent is doing uniRead, which means we're not interested
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| 94 | // in the child reading any input from the parent
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[22173] | 95 | // => child input remains coming from stdin
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[22174] | 96 | ::close(child_stdin_read);
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[22173] | 97 | }
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| 98 |
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| 99 | // Sort out output pipe
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| 100 | // child has no buisness accessing read end of output pipe => close
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[22174] | 101 | ::close(child_stdout_read_);
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[22177] | 102 | child_stdout_read_=-1;
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| 103 |
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[22173] | 104 | if ((mode == uniRead) || (mode == biReadWrite)) {
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| 105 | // wire up child's stdout write so it is send down the pipe to the parent
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| 106 | dup2(child_stdout_write, FD_STDOUT);
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| 107 | }
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| 108 | else {
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[22177] | 109 | // Parent is doing uniWrite, which means we're not interested
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| 110 | // in any output produced by the child process
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[22173] | 111 | // => child output remains going to stdout
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[22174] | 112 | ::close(child_stdout_write);
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[22173] | 113 | }
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| 114 |
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[22177] | 115 |
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[22183] | 116 | // Used to be execve(), but this would appear not to search path for
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| 117 | // 'prog_name'. The alternative execvp() does search PATH and so is
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| 118 | // more compatible with how CreateProcess works for Windows
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[22177] | 119 |
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[22183] | 120 | // Need to connect envp with externally defined '**environ' ??
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| 121 |
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| 122 | execvp(prog_name,argv);
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[22173] | 123 |
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| 124 | }
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| 125 | else {
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| 126 | // Parent process
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| 127 |
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| 128 | // Sort out input pipe
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| 129 | // parent has no buisness accessing read end of input pipe => close
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[22174] | 130 | ::close(child_stdin_read);
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[22173] | 131 |
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| 132 | // Sort out output pipe
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| 133 | // parent has no buisness accessing write end of output pipe => close
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[22174] | 134 | ::close(child_stdout_write);
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[22173] | 135 |
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| 136 |
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| 137 | switch(mode)
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| 138 | {
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| 139 | case uniRead:
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[22174] | 140 | ::close(child_stdin_write_);
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[22177] | 141 | child_stdin_write_ = -1;
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[22173] | 142 | break;
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| 143 | case uniWrite:
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[22174] | 144 | ::close(child_stdout_read_);
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[22177] | 145 | child_stdout_read_ = -1;
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[22173] | 146 | break;
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| 147 | case biReadWrite:
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| 148 | // nothing to do
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| 149 | // the pipes are set up just the way we want them
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| 150 | break;
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| 151 | }
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | osprocessunix::~osprocessunix()
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[22177] | 156 | {
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| 157 | // close any file handles that are still open
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| 158 | close();
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| 159 | }
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[22173] | 160 |
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| 161 |
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| 162 | int osprocessunix::write(char* buffer, const int buffer_len)
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| 163 | {
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| 164 |
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[22174] | 165 | int actual_write_len = ::write(child_stdin_write_, buffer, buffer_len);
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[22173] | 166 |
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[22174] | 167 | if (actual_write_len<0) {
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[22173] | 168 | cerr << "osproessunix::write() Error: failed to write data" << endl;
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| 169 | }
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| 170 |
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| 171 | return actual_write_len;
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| 172 | }
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| 173 |
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| 174 | int osprocessunix::read(char* buffer, const int buffer_len)
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| 175 | {
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[22174] | 176 | int actual_read_len = ::read(child_stdout_read_, buffer, buffer_len);
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[22173] | 177 |
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| 178 | if (actual_read_len<0) {
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| 179 | cerr << "osproessunix::read() Error: failed to read data" << endl;
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| 180 | }
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| 181 |
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| 182 | return actual_read_len;
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| 183 | }
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| 184 |
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| 185 |
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[22183] | 186 | void osprocessunix::wait()
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| 187 | {
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| 188 | int child_status;
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| 189 | //cerr << "**** waiting ..." << endl;
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| 190 | ::waitpid(pid_,&child_status,0);
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| 191 |
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| 192 | //cerr << "*** exit status = " << WEXITSTATUS(child_status) << endl;
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| 193 |
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| 194 | //cerr << "**** done" << endl;
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| 195 | }
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| 196 |
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| 197 |
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[22177] | 198 | bool osprocessunix::close_write_pipe(OSProcessWarnStatus warn_status)
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[22174] | 199 | {
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[22177] | 200 | int write_close_rv = 0;
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| 201 |
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| 202 | if (child_stdin_write_ != -1) {
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| 203 | write_close_rv = ::close(child_stdin_write_);
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| 204 | child_stdin_write_ = -1;
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| 205 | }
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[22178] | 206 | else if (warn_status == withWarning) {
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[22177] | 207 | cerr << "osprocessunix::close_write_pipe(): Warning - Tried to close already closed pipe" << endl;
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| 208 | }
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| 209 |
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| 210 | return (write_close_rv==0);
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[22174] | 211 | }
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[22173] | 212 |
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[22177] | 213 |
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| 214 | bool osprocessunix::close_read_pipe(OSProcessWarnStatus warn_status)
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[22174] | 215 | {
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[22177] | 216 | int read_close_rv = 0;
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| 217 |
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| 218 | if (child_stdout_read_ != -1) {
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| 219 | read_close_rv = ::close(child_stdout_read_);
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| 220 | child_stdout_read_ = -1;
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| 221 | }
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| 222 | else if (warn_status == withWarning) {
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| 223 | cerr << "osprocessunix::close_read_pipe(): Warning - Tried to close already closed pipe" << endl;
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| 224 | }
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| 225 |
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| 226 | return (read_close_rv==0);
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[22174] | 227 | }
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[22173] | 228 |
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| 229 |
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| 230 |
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[22177] | 231 |
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| 232 |
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| 233 |
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[22173] | 234 | #endif
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