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/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include "os.hpp"
#include "util.hpp"
#include "error.hpp"
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <limits.h>
void os_spawn_process(const char *exe, ZigList<const char *> &args, bool detached) {
pid_t pid = fork();
if (pid == -1)
zig_panic("fork failed");
if (pid != 0)
return;
if (detached) {
if (setsid() == -1)
zig_panic("process detach failed");
}
const char **argv = allocate<const char *>(args.length + 2);
argv[0] = exe;
argv[args.length + 1] = nullptr;
for (int i = 0; i < args.length; i += 1) {
argv[i + 1] = args.at(i);
}
execvp(exe, const_cast<char * const *>(argv));
zig_panic("execvp failed: %s", strerror(errno));
}
static int read_all_fd_stream(int fd, Buf *out_buf) {
static const ssize_t buf_size = 0x2000;
buf_resize(out_buf, buf_size);
ssize_t actual_buf_len = 0;
for (;;) {
ssize_t amt_read = read(fd, buf_ptr(out_buf), buf_len(out_buf));
if (amt_read < 0) {
return ErrorFileSystem;
}
actual_buf_len += amt_read;
if (amt_read == 0) {
buf_resize(out_buf, actual_buf_len);
return 0;
}
buf_resize(out_buf, actual_buf_len + buf_size);
}
zig_unreachable();
}
void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
int last_index = buf_len(full_path) - 1;
if (last_index >= 0 && buf_ptr(full_path)[last_index] == '/') {
last_index -= 1;
}
for (int i = last_index; i >= 0; i -= 1) {
uint8_t c = buf_ptr(full_path)[i];
if (c == '/') {
buf_init_from_mem(out_dirname, buf_ptr(full_path), i);
buf_init_from_mem(out_basename, buf_ptr(full_path) + i + 1, buf_len(full_path) - (i + 1));
return;
}
}
buf_init_from_mem(out_dirname, ".", 1);
buf_init_from_buf(out_basename, full_path);
}
void os_path_join(Buf *dirname, Buf *basename, Buf *out_full_path) {
buf_init_from_buf(out_full_path, dirname);
uint8_t c = *(buf_ptr(out_full_path) + buf_len(out_full_path) - 1);
if (c != '/')
buf_append_char(out_full_path, '/');
buf_append_buf(out_full_path, basename);
}
void os_exec_process(const char *exe, ZigList<const char *> &args,
int *return_code, Buf *out_stderr, Buf *out_stdout)
{
int stdin_pipe[2];
int stdout_pipe[2];
int stderr_pipe[2];
int err;
if ((err = pipe(stdin_pipe)))
zig_panic("pipe failed");
if ((err = pipe(stdout_pipe)))
zig_panic("pipe failed");
if ((err = pipe(stderr_pipe)))
zig_panic("pipe failed");
pid_t pid = fork();
if (pid == -1)
zig_panic("fork failed");
if (pid == 0) {
// child
if (dup2(stdin_pipe[0], STDIN_FILENO) == -1)
zig_panic("dup2 failed");
if (dup2(stdout_pipe[1], STDOUT_FILENO) == -1)
zig_panic("dup2 failed");
if (dup2(stderr_pipe[1], STDERR_FILENO) == -1)
zig_panic("dup2 failed");
const char **argv = allocate<const char *>(args.length + 2);
argv[0] = exe;
argv[args.length + 1] = nullptr;
for (int i = 0; i < args.length; i += 1) {
argv[i + 1] = args.at(i);
}
execvp(exe, const_cast<char * const *>(argv));
zig_panic("execvp failed: %s", strerror(errno));
} else {
// parent
close(stdin_pipe[0]);
close(stdout_pipe[1]);
close(stderr_pipe[1]);
waitpid(pid, return_code, 0);
read_all_fd_stream(stdout_pipe[0], out_stdout);
read_all_fd_stream(stderr_pipe[0], out_stderr);
}
}
void os_write_file(Buf *full_path, Buf *contents) {
int fd;
if ((fd = open(buf_ptr(full_path), O_CREAT|O_CLOEXEC|O_WRONLY|O_TRUNC, S_IRWXU)) == -1)
zig_panic("open failed");
ssize_t amt_written = write(fd, buf_ptr(contents), buf_len(contents));
if (amt_written != buf_len(contents))
zig_panic("write failed: %s", strerror(errno));
if (close(fd) == -1)
zig_panic("close failed");
}
int os_fetch_file(FILE *f, Buf *out_contents) {
return read_all_fd_stream(fileno(f), out_contents);
}
int os_fetch_file_path(Buf *full_path, Buf *out_contents) {
FILE *f = fopen(buf_ptr(full_path), "rb");
if (!f) {
switch (errno) {
case EACCES:
return ErrorAccess;
case EINTR:
return ErrorInterrupted;
case EINVAL:
zig_unreachable();
case ENFILE:
case ENOMEM:
return ErrorSystemResources;
case ENOENT:
return ErrorFileNotFound;
default:
return ErrorFileSystem;
}
}
int result = os_fetch_file(f, out_contents);
fclose(f);
return result;
}
int os_get_cwd(Buf *out_cwd) {
int err = ERANGE;
buf_resize(out_cwd, 512);
while (err == ERANGE) {
buf_resize(out_cwd, buf_len(out_cwd) * 2);
err = getcwd(buf_ptr(out_cwd), buf_len(out_cwd)) ? 0 : errno;
}
if (err)
zig_panic("unable to get cwd: %s", strerror(err));
return 0;
}
bool os_stderr_tty(void) {
return isatty(STDERR_FILENO);
}
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