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Implemented poll

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arunmu 2016-03-16 22:18:40 +05:30
parent 1128b46e5e
commit d9d132b22c
2 changed files with 42 additions and 0 deletions
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subprocess.hpp
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@ -476,8 +476,12 @@ public:
int pid() const noexcept { return child_pid_; }
int retcode() const noexcept { return retcode_; }
bool wait() throw(OSError);
int poll() throw(OSError);
void set_out_buf_cap(size_t cap) { stream_.set_out_buf_cap(cap); }
void set_err_buf_cap(size_t cap) { stream_.set_err_buf_cap(cap); }
@ -524,8 +528,11 @@ private:
std::vector<std::string> vargs_;
std::vector<char*> cargv_;
bool child_created_ = false;
// Pid of the child process
int child_pid_ = -1;
int retcode_ = -1;
};
void Popen::init_args() {
@ -573,6 +580,39 @@ bool Popen::wait() throw (OSError)
return true;
}
int Popen::poll() throw (OSError)
{
int status;
if (!child_created_) return 0; // TODO: ??
int ret = waitpid(child_pid_, &status, WNOHANG);
if (ret == child_pid_) {
if (WIFSIGNALED(status)) {
retcode_ = WTERMSIG(status);
} else if (WIFEXITED(status)) {
retcode_ = WEXITSTATUS(status);
} else {
retcode_ = 255;
}
return retcode_;
}
if (ret == -1) {
// From subprocess.py
// This happens if SIGCHLD is set to be ignored
// or waiting for child process has otherwise been disabled
// for our process. This child is dead, we cannot get the
// status.
if (errno == ECHILD) retcode_ = 0;
else throw OSError("waitpid failed", errno);
}
retcode_ = ret;
return retcode_;
}
void Popen::execute_process() throw (CalledProcessError, OSError)
{
@ -591,6 +631,8 @@ void Popen::execute_process() throw (CalledProcessError, OSError)
throw OSError("fork failed", errno);
}
child_created_ = true;
if (child_pid_ == 0)
{
// Close descriptors belonging to parent