105 lines
2.0 KiB
C++
105 lines
2.0 KiB
C++
#pragma once
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#include <giomm.h>
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#include <sys/wait.h>
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#include <unistd.h>
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namespace waybar::util::command {
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struct res {
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int exit_code;
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std::string out;
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};
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inline std::string read(FILE* fp) {
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std::array<char, 128> buffer = {0};
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std::string output;
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while (feof(fp) == 0) {
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if (fgets(buffer.data(), 128, fp) != nullptr) {
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output += buffer.data();
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}
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}
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// Remove last newline
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if (!output.empty() && output[output.length() - 1] == '\n') {
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output.erase(output.length() - 1);
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}
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return output;
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}
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inline int close(FILE* fp, pid_t pid) {
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int stat;
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fclose(fp);
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while (waitpid(pid, &stat, 0) == -1) {
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if (errno != EINTR) {
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stat = 0;
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break;
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}
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}
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return stat;
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}
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inline FILE* open(const std::string cmd, int& pid) {
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if (cmd == "") return nullptr;
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int fd[2];
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pipe(fd);
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pid_t child_pid = fork();
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if (child_pid < 0) {
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printf("Unable to exec cmd %s, error %s", cmd.c_str(), strerror(errno));
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return nullptr;
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}
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if (!child_pid) {
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::close(fd[0]);
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dup2(fd[1], 1);
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setpgid(child_pid, child_pid);
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execl("/bin/sh", "sh", "-c", cmd.c_str(), (char*)0);
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exit(0);
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} else {
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::close(fd[1]);
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}
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pid = child_pid;
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return fdopen(fd[0], "r");
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}
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inline struct res exec(std::string cmd) {
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int pid;
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auto fp = command::open(cmd, pid);
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if (!fp) return {-1, ""};
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auto output = command::read(fp);
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auto stat = command::close(fp, pid);
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if (WIFEXITED(stat)) {
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return {WEXITSTATUS(stat), output};
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}
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return {-1, output};
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}
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inline int32_t forkExec(std::string cmd) {
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if (cmd == "") return -1;
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int32_t pid = fork();
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if (pid < 0) {
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printf("Unable to exec cmd %s, error %s", cmd.c_str(), strerror(errno));
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return pid;
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}
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// Child executes the command
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if (!pid) {
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setpgid(pid, pid);
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signal(SIGCHLD, SIG_DFL);
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execl("/bin/sh", "sh", "-c", cmd.c_str(), (char*)0);
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exit(0);
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} else {
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signal(SIGCHLD,SIG_IGN);
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}
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return pid;
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}
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} // namespace waybar::util::command
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