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/*************************************************************************
** Process.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2016 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <config.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <fcntl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#endif
#include <cstdlib>
#include "FileSystem.h"
#include "Process.h"
#include "SignalHandler.h"
#include "macros.h"
using namespace std;
Process::Process (const string &cmd, const string ¶mstr)
: _cmd(cmd), _paramstr(paramstr)
{
}
#ifdef _WIN32
static void pipe_read (HANDLE handle, string &out) {
char buf[4096];
out.clear();
for (;;) {
DWORD num_chars;
bool success = ReadFile(handle, buf, 1024, &num_chars, NULL);
if (!success || num_chars == 0)
break;
out.append(buf, num_chars);
}
// remove trailing space
if (!out.empty()) {
int pos = out.size()-1;
while (pos >= 0 && isspace(out[pos]))
pos--;
out.erase(pos+1);
}
}
static inline void close_handle (HANDLE handle) {
if (handle != NULL)
CloseHandle(handle);
}
#else
/** Extracts whitespace-sparated parameters from a string.
* @param[in,out] paramstr the parameter string
* @param[out] params vector holding the extracted parameters */
static void split_paramstr (string ¶mstr, vector<const char*> ¶ms) {
size_t left=0, right=0; // index of first and last character of current parameter
char quote=0; // current quote character, 0=none
const size_t len = paramstr.length();
while (left <= right && right < len) {
while (left < len && isspace(paramstr[left]))
++left;
if (left < len && (paramstr[left] == '"' || paramstr[left] == '\''))
quote = paramstr[left++];
right = left;
while (right < len && (quote || !isspace(paramstr[right]))) {
if (quote && paramstr[right] == quote) {
quote=0;
break;
}
else
++right;
}
if (right < len)
paramstr[right]=0;
if (left < len)
params.push_back(¶mstr[left]);
left = ++right;
}
}
#endif
/** Runs the process and waits until it's finished.
* @param[out] out takes the output written to stdout by the executed process
* @return true if process terminated properly
* @throw SignalException if CTRL-C was pressed during execution */
bool Process::run (string *out) {
#ifdef _WIN32
SECURITY_ATTRIBUTES sa;
ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.bInheritHandle = true;
STARTUPINFO si;
ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.dwFlags = STARTF_USESTDHANDLES;
HANDLE devnull = NULL;
HANDLE proc_read_handle = NULL;
HANDLE proc_write_handle = NULL;
if (out) {
CreatePipe(&proc_read_handle, &proc_write_handle, &sa, 0);
SetHandleInformation(proc_read_handle, HANDLE_FLAG_INHERIT, 0);
si.hStdOutput = proc_write_handle;
}
else {
devnull = CreateFile("nul", GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, &sa, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
si.hStdOutput = devnull;
}
si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
PROCESS_INFORMATION pi;
ZeroMemory(&pi, sizeof(pi));
DWORD exitcode = DWORD(-1);
string cmdline = _cmd+" "+_paramstr;
bool success = CreateProcess(NULL, (LPSTR)cmdline.c_str(), NULL, NULL, true, 0, NULL, NULL, &si, &pi);
if (success) {
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &exitcode);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
}
close_handle(proc_write_handle); // must be closed before reading from pipe to prevent blocking
if (success && out)
pipe_read(proc_read_handle, *out);
close_handle(proc_read_handle);
close_handle(devnull);
return exitcode == 0;
#else
int pipefd[2];
pipe(pipefd);
pid_t pid = fork();
if (pid == 0) { // child process
dup2(pipefd[1], STDOUT_FILENO); // redirect stdout to the pipe
dup2(pipefd[1], STDERR_FILENO); // redirect stderr to the pipe
close(pipefd[0]);
close(pipefd[1]);
vector<const char*> params;
params.push_back(_cmd.c_str());
string paramstr = _paramstr; // private copy to be changed by split_paramstr()
split_paramstr(paramstr, params);
params.push_back(0); // trailing NULL marks end of parameter list
execvp(_cmd.c_str(), const_cast<char* const*>(¶ms[0]));
exit(1);
}
close(pipefd[1]);
bool ok = false;
if (pid > 0) { // parent process
for (;;) {
if (out) {
char buf[512];
ssize_t len;
while ((len = read(pipefd[0], buf, sizeof(buf)-1)) > 0) {
buf[len] = 0;
*out += string(buf);
}
}
int status;
waitpid(pid, &status, WNOHANG);
if (WIFEXITED(status)) { // child process exited normally
ok = (WEXITSTATUS(status) == 0);
break;
}
try {
SignalHandler::instance().check();
}
catch (SignalException &e) { // caught ctrl-c
close(pipefd[0]);
kill(pid, SIGKILL);
throw;
}
}
}
close(pipefd[0]);
return ok;
#endif
}
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