136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/*
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* Copyright (c) 2015 Andrew Kelley
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*
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* This file is part of zig, which is MIT licensed.
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* See http://opensource.org/licenses/MIT
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*/
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#include "os.hpp"
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#include "util.hpp"
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <fcntl.h>
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void os_spawn_process(const char *exe, ZigList<const char *> &args, bool detached) {
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pid_t pid = fork();
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if (pid == -1)
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zig_panic("fork failed");
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if (pid != 0)
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return;
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if (detached) {
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if (setsid() == -1)
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zig_panic("process detach failed");
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}
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const char **argv = allocate<const char *>(args.length + 2);
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argv[0] = exe;
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argv[args.length + 1] = nullptr;
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for (int i = 0; i < args.length; i += 1) {
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argv[i + 1] = args.at(i);
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}
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execvp(exe, const_cast<char * const *>(argv));
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zig_panic("execvp failed: %s", strerror(errno));
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}
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static void read_all_fd(int fd, Buf *out_buf) {
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static const ssize_t buf_size = 0x2000;
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buf_resize(out_buf, buf_size);
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ssize_t actual_buf_len = 0;
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for (;;) {
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ssize_t amt_read = read(fd, buf_ptr(out_buf), buf_len(out_buf));
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if (amt_read < 0)
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zig_panic("fd read error");
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actual_buf_len += amt_read;
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if (amt_read == 0) {
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buf_resize(out_buf, actual_buf_len);
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return;
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}
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buf_resize(out_buf, actual_buf_len + buf_size);
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}
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}
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void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
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int last_index = buf_len(full_path) - 1;
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if (last_index >= 0 && buf_ptr(full_path)[last_index] == '/') {
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last_index -= 1;
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}
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for (int i = last_index; i >= 0; i -= 1) {
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uint8_t c = buf_ptr(full_path)[i];
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if (c == '/') {
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buf_init_from_mem(out_dirname, buf_ptr(full_path), i);
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buf_init_from_mem(out_basename, buf_ptr(full_path) + i + 1, buf_len(full_path) - (i + 1));
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return;
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}
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}
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buf_init_from_mem(out_dirname, ".", 1);
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buf_init_from_buf(out_basename, full_path);
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}
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void os_exec_process(const char *exe, ZigList<const char *> &args,
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int *return_code, Buf *out_stderr, Buf *out_stdout)
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{
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int stdin_pipe[2];
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int stdout_pipe[2];
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int stderr_pipe[2];
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int err;
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if ((err = pipe(stdin_pipe)))
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zig_panic("pipe failed");
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if ((err = pipe(stdout_pipe)))
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zig_panic("pipe failed");
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if ((err = pipe(stderr_pipe)))
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zig_panic("pipe failed");
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pid_t pid = fork();
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if (pid == -1)
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zig_panic("fork failed");
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if (pid == 0) {
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// child
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if (dup2(stdin_pipe[0], STDIN_FILENO) == -1)
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zig_panic("dup2 failed");
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if (dup2(stdout_pipe[1], STDOUT_FILENO) == -1)
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zig_panic("dup2 failed");
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if (dup2(stderr_pipe[1], STDERR_FILENO) == -1)
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zig_panic("dup2 failed");
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const char **argv = allocate<const char *>(args.length + 2);
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argv[0] = exe;
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argv[args.length + 1] = nullptr;
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for (int i = 0; i < args.length; i += 1) {
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argv[i + 1] = args.at(i);
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}
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execvp(exe, const_cast<char * const *>(argv));
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zig_panic("execvp failed: %s", strerror(errno));
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} else {
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// parent
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close(stdin_pipe[0]);
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close(stdout_pipe[1]);
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close(stderr_pipe[1]);
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waitpid(pid, return_code, 0);
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read_all_fd(stdout_pipe[0], out_stdout);
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read_all_fd(stderr_pipe[0], out_stderr);
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}
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}
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void os_write_file(Buf *full_path, Buf *contents) {
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int fd;
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if ((fd = open(buf_ptr(full_path), O_CREAT|O_CLOEXEC|O_WRONLY|O_TRUNC, S_IRWXU)) == -1)
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zig_panic("open failed");
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ssize_t amt_written = write(fd, buf_ptr(contents), buf_len(contents));
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if (amt_written != buf_len(contents))
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zig_panic("write failed: %s", strerror(errno));
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if (close(fd) == -1)
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zig_panic("close failed");
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}
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