mirror of https://github.com/polybar/polybar.git
117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
#pragma once
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#include <sys/wait.h>
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#include "common.hpp"
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#include "utils/string.hpp"
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LEMONBUDDY_NS
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namespace process_util {
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/**
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* Check if currently in main process
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*/
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inline auto in_parent_process(pid_t pid) {
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return pid != -1 && pid != 0;
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}
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/**
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* Check if currently in subprocess
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*/
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inline auto in_forked_process(pid_t pid) {
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return pid == 0;
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}
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/**
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* Replace process with command
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*/
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inline auto exec(string cmd) {
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vector<char*> c_args;
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vector<string> args;
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if (string_util::contains(cmd, "\n"))
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string_util::split_into(cmd, '\n', args);
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else
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string_util::split_into(cmd, ' ', args);
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for (auto&& argument : args) c_args.emplace_back(const_cast<char*>(argument.c_str()));
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c_args.emplace_back(nullptr);
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execvp(c_args[0], c_args.data());
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throw system_error("Failed to execute command");
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}
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/**
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* Wait for child process
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*/
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inline auto wait_for_completion(pid_t process_id, int* status_addr, int waitflags = 0) {
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int saved_errno = errno;
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auto retval = waitpid(process_id, status_addr, waitflags);
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errno = saved_errno;
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return retval;
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}
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/**
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* Wait for child process
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*/
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inline auto wait_for_completion(int* status_addr, int waitflags = 0) {
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return wait_for_completion(-1, status_addr, waitflags);
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}
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/**
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* Wait for child process
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*/
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inline auto wait_for_completion(pid_t process_id) {
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int status = 0;
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return wait_for_completion(process_id, &status);
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}
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/**
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* Non-blocking wait
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*
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* @see wait_for_completion
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*/
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inline auto wait_for_completion_nohang(pid_t process_id, int* status) {
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return wait_for_completion(process_id, status, WNOHANG);
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}
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/**
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* Non-blocking wait
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*
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* @see wait_for_completion
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*/
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inline auto wait_for_completion_nohang(int* status) {
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return wait_for_completion_nohang(-1, status);
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}
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/**
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* Non-blocking wait
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*
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* @see wait_for_completion
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*/
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inline auto wait_for_completion_nohang() {
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int status = 0;
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return wait_for_completion_nohang(-1, &status);
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}
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/**
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* Non-blocking wait call which returns pid of any child process
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*
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* @see wait_for_completion
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*/
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inline auto notify_childprocess() {
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return wait_for_completion_nohang() > 0;
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}
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inline auto unblock_signal(int sig) {
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sigset_t sigmask;
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sigemptyset(&sigmask);
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sigaddset(&sigmask, sig);
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if (pthread_sigmask(SIG_UNBLOCK, &sigmask, nullptr) == -1)
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throw system_error("Failed to change pthread_sigmask");
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}
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}
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LEMONBUDDY_NS_END
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