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Mini Shell
Mini Shell
/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <boost/thread.hpp>
#include <oxt/system_calls.hpp>
#include <string>
#include <algorithm>
#include <cerrno>
#include <ProcessManagement/Spawn.h>
#include <ProcessManagement/Utils.h>
#include <StaticString.h>
#include <Exceptions.h>
#include <IOTools/IOUtils.h>
namespace Passenger {
using namespace std;
int
runShellCommand(const StaticString &command) {
string commandNt = command;
const char *argv[] = {
"/bin/sh",
"-c",
commandNt.c_str(),
NULL
};
SubprocessInfo info;
runCommand(argv, info);
return info.status;
}
void
runCommand(const char **command, SubprocessInfo &info, bool wait, bool killSubprocessOnInterruption,
const boost::function<void ()> &afterFork,
const boost::function<void (const char **, int errcode)> &onExecFail)
{
int e, waitStatus;
pid_t waitRet;
info.pid = syscalls::fork();
if (info.pid == 0) {
resetSignalHandlersAndMask();
disableMallocDebugging();
if (afterFork) {
afterFork();
}
closeAllFileDescriptors(2);
execvp(command[0], (char * const *) command);
if (onExecFail) {
onExecFail(command, errno);
}
_exit(1);
} else if (info.pid == -1) {
e = errno;
throw SystemException("Cannot fork() a new process", e);
} else if (wait) {
try {
waitRet = syscalls::waitpid(info.pid, &waitStatus, 0);
} catch (const boost::thread_interrupted &) {
if (killSubprocessOnInterruption) {
boost::this_thread::disable_syscall_interruption dsi;
syscalls::kill(SIGKILL, info.pid);
syscalls::waitpid(info.pid, NULL, 0);
}
throw;
}
if (waitRet != -1) {
info.status = waitStatus;
} else if (errno == ECHILD || errno == ESRCH) {
info.status = -2;
} else {
int e = errno;
throw SystemException(string("Error waiting for the '") +
command[0] + "' command", e);
}
}
}
void
runCommandAndCaptureOutput(const char **command, SubprocessInfo &info,
SubprocessOutput &output, size_t maxSize, bool killSubprocessOnInterruption,
const boost::function<void ()> &afterFork,
const boost::function<void (const char **command, int errcode)> &onExecFail)
{
pid_t waitRet;
int e, waitStatus;
Pipe p;
p = createPipe(__FILE__, __LINE__);
info.pid = syscalls::fork();
if (info.pid == 0) {
dup2(p[1], 1);
close(p[0]);
close(p[1]);
resetSignalHandlersAndMask();
disableMallocDebugging();
if (afterFork) {
afterFork();
}
closeAllFileDescriptors(2);
execvp(command[0], (char * const *) command);
if (onExecFail) {
onExecFail(command, errno);
}
_exit(1);
} else if (info.pid == -1) {
e = errno;
throw SystemException("Cannot fork() a new process", e);
} else {
size_t totalRead = 0;
output.eof = false;
p[1].close();
while (totalRead < maxSize) {
char buf[1024 * 4];
ssize_t ret;
try {
ret = syscalls::read(p[0], buf,
std::min<size_t>(sizeof(buf), maxSize - totalRead));
} catch (const boost::thread_interrupted &) {
if (killSubprocessOnInterruption) {
boost::this_thread::disable_syscall_interruption dsi;
syscalls::kill(SIGKILL, info.pid);
syscalls::waitpid(info.pid, NULL, 0);
}
throw;
}
if (ret == -1) {
e = errno;
if (killSubprocessOnInterruption) {
boost::this_thread::disable_syscall_interruption dsi;
syscalls::kill(SIGKILL, info.pid);
syscalls::waitpid(info.pid, NULL, 0);
}
throw SystemException(string("Cannot read output from the '") +
command[0] + "' command", e);
} else if (ret == 0) {
output.eof = true;
break;
} else {
totalRead += ret;
output.data.append(buf, ret);
}
}
p[0].close();
try {
waitRet = syscalls::waitpid(info.pid, &waitStatus, 0);
} catch (const boost::thread_interrupted &) {
if (killSubprocessOnInterruption) {
boost::this_thread::disable_syscall_interruption dsi;
syscalls::kill(SIGKILL, info.pid);
syscalls::waitpid(info.pid, NULL, 0);
}
throw;
}
if (waitRet != -1) {
info.status = waitStatus;
} else if (errno == ECHILD || errno == ESRCH) {
info.status = -2;
} else {
int e = errno;
throw SystemException(string("Error waiting for the '") +
command[0] + "' command", e);
}
}
}
} // namespace Passenger
Zerion Mini Shell 1.0