C++ Library containing a lot of needful things: Stack Trace, Command Line Parser, Resource Handling, Configuration Files, Unix Command Execution, Directories, Regular Expressions, Tokenizer, Function Trace, Standard Extensions.
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569 lines
19 KiB
569 lines
19 KiB
/** @file |
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$Id$ |
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$Date$ |
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$Author$ |
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@copy © Marc Wäckerlin |
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@license LGPL, see file <a href="license.html">COPYING</a> |
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$Log$ |
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Revision 1.14 2005/11/29 12:39:42 marc |
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make it compilable with gcc 4.0.2 and newer doxygen |
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Revision 1.13 2005/04/20 18:32:14 marc |
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*** empty log message *** |
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Revision 1.12 2005/04/20 18:12:55 marc |
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added kill() for PartialExec |
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Revision 1.11 2005/04/19 18:48:00 marc |
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new feature PartialExec |
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Revision 1.10 2005/03/14 16:26:34 marc |
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bugs have been fixed a long time ago, now no more in buglist |
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Revision 1.9 2004/12/20 07:40:35 marc |
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documentation improved, new grouping |
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Revision 1.8 2004/12/18 21:00:09 marc |
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everything is ok, when pipes are non blocking on parent's side and blocking on client's side, and select is not used (not necessary for non blocking IO) |
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Revision 1.7 2004/12/17 17:38:57 marc |
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it works perfectly with blocking pipes and buffer size of 1 |
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Revision 1.6 2004/12/17 16:28:51 marc |
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stable implementation with select for both executes |
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Revision 1.5 2004/12/14 20:30:09 marc |
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added possibility to pass string to stdin of child process |
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Revision 1.4 2004/08/28 16:21:25 marc |
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mrw-c++-0.92 (mrw) |
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- new file: version.cxx |
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- new file header for all sources |
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- work around warning in mrw::auto<T> |
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- possibility to compile without log4cxx |
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- work around bugs in demangle.h and libiberty.h |
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- corrections in documentation |
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- added simple tracing mechanism |
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- more warnings |
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- small corrections in Auto<>::Free and a new test for it |
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- possibility to compile without stack trace |
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*/ |
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#include <mrw/exec.hxx> |
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#include <mrw/unistd.hxx> |
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#include <mrw/exception.hxx> |
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#include <sys/wait.h> // waitpid |
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#include <unistd.h> // fork, exec |
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#include <string.h> // memcpy |
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#include <assert.h> // assert |
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#include <sys/types.h> // kill |
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#include <signal.h> // kill |
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#include <cstdlib> // exit |
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//=========================================================== ExecutionFailedExc |
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//------------------------------------------------------------------------------ |
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mrw::ExecutionFailedExc::ExecutionFailedExc(const std::string& w, |
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const std::string& c) |
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: |
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_what(std::string("mrw::Exec: command execution failed\n")+ |
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std::string(" failed command was: \""+c+"\"\n")+ |
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std::string(" error was: \"")+w+'"') { |
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/** |
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@c what looks like: |
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@verbatim |
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mrw::Exec: command execution failed |
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failed command was: "/bin/OOOOPS -v -q --crash" |
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error was: "execution failed" |
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@endverbatim |
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*/ |
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} |
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//========================================================================== Cmd |
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//------------------------------------------------------------------------------ |
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mrw::Cmd::Cmd(const std::string& c) { |
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_cmd.push_back(c); |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Cmd& mrw::Cmd::operator,(const std::string& arg) |
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{ |
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_cmd.push_back(arg); |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Cmd& mrw::Cmd::operator<<(const std::string& arg) |
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{ |
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_cmd.push_back(arg); |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Cmd::operator std::string() const { |
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ArgList::const_iterator it(_cmd.begin()); |
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std::string c(*it); |
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while (++it!=_cmd.end()) c+=' '+*it; |
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return c; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Cmd::operator mrw::Exec() const { |
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return mrw::Exec(*this); |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Cmd::operator mrw::PartialExec() const { |
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return mrw::PartialExec(*this); |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec mrw::Cmd::execute(bool exc) const { |
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return mrw::Exec(*this).execute(exc); |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec mrw::Cmd::execute(const std::string& input, bool exc) const |
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{ |
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return mrw::Exec(*this).execute(input, exc); |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec mrw::Cmd::start(bool useInput) const { |
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return mrw::PartialExec(*this).start(useInput); |
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} |
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//------------------------------------------------------------------------------ |
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const char* mrw::Cmd::path() const { |
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return _cmd.front().c_str(); |
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} |
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//------------------------------------------------------------------------------ |
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char** mrw::Cmd::args() const { |
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if (_cmd.size()==0) return 0; |
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char** array = new char*[_cmd.size()+1]; |
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int i(0); |
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for (ArgList::const_iterator it(_cmd.begin()); it!=_cmd.end(); ++it) |
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memcpy(array[i++]=new char[it->size()+1], it->c_str(), it->size()+1); |
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array[i] = 0; |
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return array; |
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} |
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//========================================================================= Exec |
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//------------------------------------------------------------------------------ |
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mrw::Exec::Exec(const mrw::Cmd& c) : |
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_cmd(new mrw::Cmd(c)), _success(false) { |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec::Exec(const mrw::Exec& e) : |
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_cmd(new mrw::Cmd(*e._cmd)), |
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_res(e._res), _err(e._err), _success(e._success) { |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec::~Exec() noexcept { |
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delete _cmd; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec& mrw::Exec::operator=(const mrw::Exec& e) { |
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if (this==&e) return *this; |
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*_cmd=*e._cmd; _res=e._res; _err=e._err; _success=e._success; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec& mrw::Exec::execute(bool exc) { |
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/** This method calls @c fork, sets up a pipe connection to pass @c |
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stdout and @c stderr from the child process to the parent |
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process using mrw::Pipe and calls @c execvp to execute the |
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program. */ |
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_success = false; |
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_res = _err = ""; |
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mrw::Pipe stdOut(mrw::Pipe::block_output), stdErr(mrw::Pipe::block_output); |
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if (!stdOut || !stdErr) |
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throw mrw::ExecutionFailedExc("cannot create pipe", *_cmd); |
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pid_t pid(fork()); |
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if (pid<0) |
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throw ExecutionFailedExc("cannot fork", *_cmd); |
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if (pid) { // parent |
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stdOut.close_out(); |
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stdErr.close_out(); |
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if (!stdOut || !stdErr) |
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throw ExecutionFailedExc("cannot close pipe", *_cmd); |
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ssize_t num1(1), num2(1); |
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char buf[4096]; |
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int res(0), s(0); |
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/* It sometimes did not get the whole input since I changed to non |
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blocking pipes. Now I have found the solution to the problems: |
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Non blocking IO does not work in conjunction with select! |
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Also the pipe must not be nonblocking on both ends, but only on |
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one. */ |
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while (num1||num2||!res) try { // not end of files or child terminated |
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if (!res && (res=waitpid(pid, &s, WNOHANG))) |
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if (res!=pid || (WIFEXITED(s)!=0 && WEXITSTATUS(s)!=0)) |
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throw ExecutionFailedExc("execution failed", *_cmd); |
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if (num1<=0&&num2<=0) usleep(10000); // nothing to read last time |
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// check and handle stdout |
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if (num1 && (num1=read(stdOut.istream(), buf, sizeof(buf)))>0) { |
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_res += std::string(buf, num1); |
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} else if (num1==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) { |
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throw ExecutionFailedExc("readin stdout", *_cmd); |
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} else { |
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num1 = 1; |
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} |
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} |
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// check and handle stderr |
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if (num2 && (num2=read(stdErr.istream(), buf, sizeof(buf)))>0) { |
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_err += std::string(buf, num2); |
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} else if (num2==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) { |
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throw ExecutionFailedExc("readin stderr", *_cmd); |
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} else { |
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num2 = 1; |
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} |
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} |
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} catch (...) { |
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_success = false; |
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if (exc) throw; |
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return *this; |
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} |
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} else { // child |
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stdOut.close_in(); |
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stdErr.close_in(); |
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stdOut.connect_cout(); |
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stdErr.connect_cerr(); |
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execvp(_cmd->path(), _cmd->args()); |
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exit(1); // execute failed |
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} |
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_success = true; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec& mrw::Exec::execute(const std::string& input, bool exc) |
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{ |
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#ifdef SSIZE_MAX |
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/// @c input length must be smaller than @c SSIZE_MAX. |
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/// I'll only add support for longer strings upon request. |
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assert(input.size()<=SSIZE_MAX && |
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"sdin input exeeds C library limit in mrw::Exec " |
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"please contact the author of the library"); |
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#endif |
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/** This method calls @c fork, sets up a pipe connection to pass @c |
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stdin, @c stdout and @c stderr between the child process and the |
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parent process using mrw::Pipe and calls @c execvp to execute |
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the program. */ |
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_success = false; |
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_res = _err = ""; |
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mrw::Pipe stdIn(mrw::Pipe::block_input), |
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stdOut(mrw::Pipe::block_output), stdErr(mrw::Pipe::block_output); |
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if (!stdIn || !stdOut || !stdErr) |
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throw mrw::ExecutionFailedExc("cannot create pipe", *_cmd); |
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pid_t pid(fork()); |
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if (pid<0) throw ExecutionFailedExc("cannot fork", *_cmd); |
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if (pid) { // parent |
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stdIn.close_in(); |
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stdOut.close_out(); |
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stdErr.close_out(); |
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if (!stdIn || !stdOut || !stdErr) |
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throw ExecutionFailedExc("cannot close pipes", *_cmd); |
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ssize_t num0(1), num1(1), num2(1); |
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std::string in(input); |
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char buf[4096]; |
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int res(0), s(0); |
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/* It sometimes did not get the whole input since I changed to non |
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blocking pipes. Now I have found the solution to the problems: |
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Non blocking IO does not work in conjunction with select! Also |
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the pipe must not be nonblocking on both ends, but only on |
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one. */ |
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while (num0||num1||num2||!res) try { // not end of files or child terminated |
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if (!res && (res=waitpid(pid, &s, WNOHANG))) |
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if (res!=pid || (WIFEXITED(s)!=0 && WEXITSTATUS(s)!=0)) |
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throw ExecutionFailedExc("execution failed", *_cmd); |
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if (num0<=0&&num1<=0&&num2<=0) usleep(10000); // no activity last time |
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// check and handle stdin |
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if (num0 && (num0=write(stdIn.ostream(), in.c_str(), in.size()))>0) { |
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if ((unsigned int)num0<in.size()) |
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in = in.substr(num0); |
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else if ((unsigned int)num0==in.size()) |
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num0=0, stdIn.close_out(); |
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} else if (num0==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) |
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throw ExecutionFailedExc("writing stdin", *_cmd); |
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else |
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num0 = 1; |
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} |
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// check and handle stdout |
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if (num1 && (num1=read(stdOut.istream(), buf, sizeof(buf)))>0) { |
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_res += std::string(buf, num1); |
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} else if (num1==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) { |
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throw ExecutionFailedExc("readin stdout", *_cmd); |
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} else { |
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num1 = 1; |
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} |
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} |
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// check and handle stderr |
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if (num2 && (num2=read(stdErr.istream(), buf, sizeof(buf)))>0) { |
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_err += std::string(buf, num2); |
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} else if (num2==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) { |
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throw ExecutionFailedExc("readin stderr", *_cmd); |
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} else { |
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num2 = 1; |
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} |
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} |
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} catch (...) { |
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_success = false; |
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if (exc) throw; |
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return *this; |
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} |
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} else { // child |
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stdIn.close_out(); |
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stdOut.close_in(); |
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stdErr.close_in(); |
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stdIn.connect_cin(); |
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stdOut.connect_cout(); |
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stdErr.connect_cerr(); |
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execvp(_cmd->path(), _cmd->args()); |
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exit(1); // execute failed |
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} |
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_success = true; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec& mrw::Exec::operator>>(std::string& res) { |
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execute(); |
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res += _res; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec::operator std::string&() { |
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if (!_success) execute(); |
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return _res; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::Exec::operator bool() { |
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return _success; |
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} |
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//------------------------------------------------------------------------------ |
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std::string& mrw::Exec::result() { |
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if (!_success) execute(); |
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return _res; |
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} |
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//------------------------------------------------------------------------------ |
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std::string& mrw::Exec::error() { |
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if (!_success) execute(); |
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return _err; |
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} |
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//------------------------------------------------------------------------------ |
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bool mrw::Exec::success() { |
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return _success; |
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} |
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//================================================================== PartialExec |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec::PartialExec(const mrw::Cmd& c) : |
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Exec(c), _finished(true), _finish(false) { |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec::PartialExec(mrw::PartialExec& e) |
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: |
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Exec(e), _finished(e._finished), _finish(e._finish), |
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_stdIn(e._stdIn), _stdOut(e._stdOut), _stdErr(e._stdErr), _input(e._input), |
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_num0(e._num0), _num1(e._num1), _num2(e._num2), |
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_lastPid(e._lastPid), _pid(e._pid) { |
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e._finished = true; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec::PartialExec(const mrw::PartialExec& e) |
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: |
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Exec(e), _finished(e._finished), _finish(e._finish), |
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_input(e._input), |
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_num0(e._num0), _num1(e._num1), _num2(e._num2), |
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_lastPid(e._lastPid), _pid(e._pid) { |
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/** @warning @c const is casted away */ |
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mrw::PartialExec& nonConstE(const_cast<mrw::PartialExec&>(e)); |
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_stdIn = nonConstE._stdIn; |
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_stdOut = nonConstE._stdOut; |
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_stdErr = nonConstE._stdErr; |
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nonConstE._finished = true; |
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nonConstE._finish = false; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec& mrw::PartialExec::operator=(mrw::PartialExec& e) |
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{ |
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if (this==&e) return *this; |
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*_cmd=*e._cmd; _res=e._res; _err=e._err; _success=e._success; |
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_finished = e._finished; |
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_finish = e._finish; |
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_stdIn = e._stdIn; _stdOut = e._stdOut; _stdErr = e._stdErr; |
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_input = e._input; _num0 = e._num0; _num1 = e._num1; _num2 = e._num2; |
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_lastPid = e._lastPid; |
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_pid = e._pid; |
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e._finished = true; |
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e._finish = false; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec& mrw::PartialExec::finish() noexcept { |
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_finish = true; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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bool mrw::PartialExec::finished() noexcept { |
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return _finished; |
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} |
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//------------------------------------------------------------------------------ |
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mrw::PartialExec& mrw::PartialExec::start(bool useInput) |
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{ |
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if (!_finished) throw mrw::runtime_error("running process not yet finished"); |
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/** This method calls @c fork, sets up a pipe connection to pass @c |
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stdin, @c stdout and @c stderr between the child process and the |
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parent process using mrw::Pipe and calls @c execvp to execute |
|
the program. */ |
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_success = false; |
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_finish = !useInput; |
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_input = ""; |
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_res = _err = ""; |
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_stdIn = std::shared_ptr<mrw::Pipe>(new mrw::Pipe(mrw::Pipe::block_input)); |
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_stdOut = std::shared_ptr<mrw::Pipe>(new mrw::Pipe(mrw::Pipe::block_output)); |
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_stdErr = std::shared_ptr<mrw::Pipe>(new mrw::Pipe(mrw::Pipe::block_output)); |
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if (!*_stdIn || !*_stdOut || !*_stdErr) |
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throw mrw::ExecutionFailedExc("cannot create pipe", *_cmd); |
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_lastPid = 0; |
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_pid = fork(); |
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if (_pid<0) throw ExecutionFailedExc("cannot fork", *_cmd); |
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if (_pid) { // parent |
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_stdIn->close_in(); |
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_stdOut->close_out(); |
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_stdErr->close_out(); |
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if (!*_stdIn || !*_stdOut || !*_stdErr) |
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throw ExecutionFailedExc("cannot close pipes", *_cmd); |
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_num0 = _num1 = _num2 = 1; |
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_finished = false; |
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} else { // child |
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_stdIn->close_out(); |
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_stdOut->close_in(); |
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_stdErr->close_in(); |
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_stdIn->connect_cin(); |
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_stdOut->connect_cout(); |
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_stdErr->connect_cerr(); |
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execvp(_cmd->path(), _cmd->args()); |
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exit(1); // execute failed |
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} |
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_success = true; |
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return *this; |
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} |
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//------------------------------------------------------------------------------ |
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std::pair<std::string, std::string> |
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mrw::PartialExec::read(const std::string& input, bool exc) |
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{ |
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std::pair<std::string, std::string> output; |
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#ifdef SSIZE_MAX |
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/** @note @c input length must be smaller than @c SSIZE_MAX. |
|
I'll only add support for longer strings upon request. */ |
|
assert(input.size()<=SSIZE_MAX && |
|
"sdin input exeeds C library limit in mrw::Exec " |
|
"please contact the author of the library"); |
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#endif |
|
/** @warning After calling finish(), it is forbidden to pass |
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any @c input string, it must then always be empty, |
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because the pipe is already closed! */ |
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assert(!(_finish && input.size()) && |
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"after calling PartialExec::finish(), it is forbidden " |
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"to pass new input text, because the pipe is already " |
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"closed! this is a programming but that must be solved!"); |
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_input += input; |
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/* It sometimes did not get the whole input since I changed to non |
|
blocking pipes. Now I have found the solution to the problems: |
|
Non blocking IO does not work in conjunction with select! Also |
|
the pipe must not be nonblocking on both ends, but only on |
|
one. */ |
|
if (!_finished) try { // not finished |
|
char buf[4096]; |
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int s(0); |
|
if (!_lastPid && (_lastPid=waitpid(_pid, &s, WNOHANG))) { |
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if (_lastPid!=_pid || (WIFEXITED(s)!=0 && WEXITSTATUS(s)!=0)) |
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throw ExecutionFailedExc("execution failed", *_cmd); |
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} |
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// check and handle stdin |
|
if (_input.size() && _num0!=-1 && |
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(_num0=write(_stdIn->ostream(), _input.c_str(), _input.size()))>0) { |
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if ((unsigned int)_num0<_input.size()) |
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_input = _input.substr(_num0); |
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else if ((unsigned int)_num0==_input.size()) |
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_input.clear(); |
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} else if (_num0==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) |
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throw ExecutionFailedExc("writing stdin", *_cmd); |
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else |
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_num0 = 1; |
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} |
|
// check and handle stdout |
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if (_num1 && (_num1=::read(_stdOut->istream(), buf, sizeof(buf)))>0) { |
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_res += output.first=std::string(buf, _num1); |
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} else if (_num1==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) |
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throw ExecutionFailedExc("readin stdout", *_cmd); |
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else |
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_num1 = 1; |
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} |
|
// check and handle stderr |
|
if (_num2 && (_num2=::read(_stdErr->istream(), buf, sizeof(buf)))>0) { |
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_err += output.second=std::string(buf, _num2); |
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} else if (_num2==-1) { |
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if (errno!=EINTR&&errno!=EAGAIN) |
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throw ExecutionFailedExc("readin stderr", *_cmd); |
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else |
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_num2 = 1; |
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} |
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if (_finish && !_input.size()) { |
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_stdIn->close_out(); |
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_num0 = 0; |
|
} |
|
_finished = _finish && !_input.size() && !_num1 && !_num2 && _lastPid; |
|
} catch (mrw::exception& x) { |
|
_finished = true; |
|
_success = false; |
|
if (exc) throw; |
|
return output; |
|
} |
|
if (_finished) _success = true; |
|
return output; |
|
} |
|
|
|
//------------------------------------------------------------------------------ |
|
mrw::PartialExec& mrw::PartialExec::terminate() noexcept { |
|
::kill(_pid, SIGTERM); |
|
return *this; |
|
} |
|
|
|
//------------------------------------------------------------------------------ |
|
mrw::PartialExec& mrw::PartialExec::kill() noexcept { |
|
::kill(_pid, SIGKILL); |
|
return *this; |
|
}
|
|
|