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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#if defined(__APPLE__) && !TARGET_OS_IPHONE
# include <crt_externs.h>
# define environ (*_NSGetEnviron())
#else
extern char **environ;
#endif
static ngx_queue_t* uv__process_queue(uv_loop_t* loop, int pid) {
assert(pid > 0);
return loop->process_handles + pid % ARRAY_SIZE(loop->process_handles);
}
static uv_process_t* uv__process_find(uv_loop_t* loop, int pid) {
uv_process_t* handle;
ngx_queue_t* h;
ngx_queue_t* q;
h = uv__process_queue(loop, pid);
ngx_queue_foreach(q, h) {
handle = ngx_queue_data(q, uv_process_t, queue);
if (handle->pid == pid) return handle;
}
return NULL;
}
static void uv__chld(uv_signal_t* handle, int signum) {
uv_process_t* process;
int exit_status;
int term_signal;
int status;
pid_t pid;
assert(signum == SIGCHLD);
for (;;) {
pid = waitpid(-1, &status, WNOHANG);
if (pid == 0)
return;
if (pid == -1) {
if (errno == ECHILD)
return; /* XXX stop signal watcher? */
else
abort();
}
process = uv__process_find(handle->loop, pid);
if (process == NULL)
continue; /* XXX bug? abort? */
uv__handle_stop(process);
if (process->exit_cb == NULL)
continue;
exit_status = 0;
term_signal = 0;
if (WIFEXITED(status))
exit_status = WEXITSTATUS(status);
if (WIFSIGNALED(status))
term_signal = WTERMSIG(status);
if (process->errorno) {
uv__set_sys_error(process->loop, process->errorno);
exit_status = -1; /* execve() failed */
}
process->exit_cb(process, exit_status, term_signal);
}
}
int uv__make_socketpair(int fds[2], int flags) {
#if defined(__linux__)
static int no_cloexec;
if (no_cloexec)
goto skip;
if (socketpair(AF_UNIX, SOCK_STREAM | UV__SOCK_CLOEXEC | flags, 0, fds) == 0)
return 0;
/* Retry on EINVAL, it means SOCK_CLOEXEC is not supported.
* Anything else is a genuine error.
*/
if (errno != EINVAL)
return -1;
no_cloexec = 1;
skip:
#endif
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
return -1;
uv__cloexec(fds[0], 1);
uv__cloexec(fds[1], 1);
if (flags & UV__F_NONBLOCK) {
uv__nonblock(fds[0], 1);
uv__nonblock(fds[1], 1);
}
return 0;
}
int uv__make_pipe(int fds[2], int flags) {
#if defined(__linux__)
static int no_pipe2;
if (no_pipe2)
goto skip;
if (uv__pipe2(fds, flags | UV__O_CLOEXEC) == 0)
return 0;
if (errno != ENOSYS)
return -1;
no_pipe2 = 1;
skip:
#endif
if (pipe(fds))
return -1;
uv__cloexec(fds[0], 1);
uv__cloexec(fds[1], 1);
if (flags & UV__F_NONBLOCK) {
uv__nonblock(fds[0], 1);
uv__nonblock(fds[1], 1);
}
return 0;
}
/*
* Used for initializing stdio streams like options.stdin_stream. Returns
* zero on success.
*/
static int uv__process_init_stdio(uv_stdio_container_t* container, int fds[2]) {
int mask;
int fd;
mask = UV_IGNORE | UV_CREATE_PIPE | UV_INHERIT_FD | UV_INHERIT_STREAM;
switch (container->flags & mask) {
case UV_IGNORE:
return 0;
case UV_CREATE_PIPE:
assert(container->data.stream != NULL);
if (container->data.stream->type != UV_NAMED_PIPE) {
errno = EINVAL;
return -1;
}
return uv__make_socketpair(fds, 0);
case UV_INHERIT_FD:
case UV_INHERIT_STREAM:
if (container->flags & UV_INHERIT_FD)
fd = container->data.fd;
else
fd = uv__stream_fd(container->data.stream);
if (fd == -1) {
errno = EINVAL;
return -1;
}
fds[1] = fd;
return 0;
default:
assert(0 && "Unexpected flags");
return -1;
}
}
static int uv__process_open_stream(uv_stdio_container_t* container,
int pipefds[2],
int writable) {
int flags;
if (!(container->flags & UV_CREATE_PIPE) || pipefds[0] < 0)
return 0;
if (close(pipefds[1]))
if (errno != EINTR && errno != EINPROGRESS)
abort();
pipefds[1] = -1;
uv__nonblock(pipefds[0], 1);
if (container->data.stream->type == UV_NAMED_PIPE &&
((uv_pipe_t*)container->data.stream)->ipc)
flags = UV_STREAM_READABLE | UV_STREAM_WRITABLE;
else if (writable)
flags = UV_STREAM_WRITABLE;
else
flags = UV_STREAM_READABLE;
return uv__stream_open(container->data.stream, pipefds[0], flags);
}
static void uv__process_close_stream(uv_stdio_container_t* container) {
if (!(container->flags & UV_CREATE_PIPE)) return;
uv__stream_close((uv_stream_t*)container->data.stream);
}
static void uv__write_int(int fd, int val) {
ssize_t n;
do
n = write(fd, &val, sizeof(val));
while (n == -1 && errno == EINTR);
if (n == -1 && errno == EPIPE)
return; /* parent process has quit */
assert(n == sizeof(val));
}
static void uv__process_child_init(uv_process_options_t options,
int stdio_count,
int (*pipes)[2],
int error_fd) {
int close_fd;
int use_fd;
int fd;
if (options.flags & UV_PROCESS_DETACHED)
setsid();
for (fd = 0; fd < stdio_count; fd++) {
close_fd = pipes[fd][0];
use_fd = pipes[fd][1];
if (use_fd >= 0)
close(close_fd);
else if (fd >= 3)
continue;
else {
/* redirect stdin, stdout and stderr to /dev/null even if UV_IGNORE is
* set
*/
use_fd = open("/dev/null", fd == 0 ? O_RDONLY : O_RDWR);
if (use_fd == -1) {
uv__write_int(error_fd, errno);
perror("failed to open stdio");
_exit(127);
}
}
if (fd == use_fd)
uv__cloexec(use_fd, 0);
else {
dup2(use_fd, fd);
close(use_fd);
}
if (fd <= 2)
uv__nonblock(fd, 0);
}
if (options.cwd && chdir(options.cwd)) {
uv__write_int(error_fd, errno);
perror("chdir()");
_exit(127);
}
if ((options.flags & UV_PROCESS_SETGID) && setgid(options.gid)) {
uv__write_int(error_fd, errno);
perror("setgid()");
_exit(127);
}
if ((options.flags & UV_PROCESS_SETUID) && setuid(options.uid)) {
uv__write_int(error_fd, errno);
perror("setuid()");
_exit(127);
}
if (options.env) {
environ = options.env;
}
execvp(options.file, options.args);
uv__write_int(error_fd, errno);
perror("execvp()");
_exit(127);
}
int uv_spawn(uv_loop_t* loop,
uv_process_t* process,
const uv_process_options_t options) {
int signal_pipe[2] = { -1, -1 };
int (*pipes)[2];
int stdio_count;
ngx_queue_t* q;
ssize_t r;
pid_t pid;
int i;
assert(options.file != NULL);
assert(!(options.flags & ~(UV_PROCESS_DETACHED |
UV_PROCESS_SETGID |
UV_PROCESS_SETUID |
UV_PROCESS_WINDOWS_HIDE |
UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS)));
uv__handle_init(loop, (uv_handle_t*)process, UV_PROCESS);
ngx_queue_init(&process->queue);
stdio_count = options.stdio_count;
if (stdio_count < 3)
stdio_count = 3;
pipes = malloc(stdio_count * sizeof(*pipes));
if (pipes == NULL) {
errno = ENOMEM;
goto error;
}
for (i = 0; i < stdio_count; i++) {
pipes[i][0] = -1;
pipes[i][1] = -1;
}
for (i = 0; i < options.stdio_count; i++)
if (uv__process_init_stdio(options.stdio + i, pipes[i]))
goto error;
/* This pipe is used by the parent to wait until
* the child has called `execve()`. We need this
* to avoid the following race condition:
*
* if ((pid = fork()) > 0) {
* kill(pid, SIGTERM);
* }
* else if (pid == 0) {
* execve("/bin/cat", argp, envp);
* }
*
* The parent sends a signal immediately after forking.
* Since the child may not have called `execve()` yet,
* there is no telling what process receives the signal,
* our fork or /bin/cat.
*
* To avoid ambiguity, we create a pipe with both ends
* marked close-on-exec. Then, after the call to `fork()`,
* the parent polls the read end until it EOFs or errors with EPIPE.
*/
if (uv__make_pipe(signal_pipe, 0))
goto error;
uv_signal_start(&loop->child_watcher, uv__chld, SIGCHLD);
pid = fork();
if (pid == -1) {
close(signal_pipe[0]);
close(signal_pipe[1]);
goto error;
}
if (pid == 0) {
uv__process_child_init(options, stdio_count, pipes, signal_pipe[1]);
abort();
}
close(signal_pipe[1]);
process->errorno = 0;
do
r = read(signal_pipe[0], &process->errorno, sizeof(process->errorno));
while (r == -1 && errno == EINTR);
if (r == 0)
; /* okay, EOF */
else if (r == sizeof(process->errorno))
; /* okay, read errorno */
else if (r == -1 && errno == EPIPE)
; /* okay, got EPIPE */
else
abort();
close(signal_pipe[0]);
for (i = 0; i < options.stdio_count; i++) {
if (uv__process_open_stream(options.stdio + i, pipes[i], i == 0)) {
while (i--) uv__process_close_stream(options.stdio + i);
goto error;
}
}
q = uv__process_queue(loop, pid);
ngx_queue_insert_tail(q, &process->queue);
process->pid = pid;
process->exit_cb = options.exit_cb;
uv__handle_start(process);
free(pipes);
return 0;
error:
uv__set_sys_error(process->loop, errno);
for (i = 0; i < stdio_count; i++) {
close(pipes[i][0]);
close(pipes[i][1]);
}
free(pipes);
return -1;
}
int uv_process_kill(uv_process_t* process, int signum) {
int r = kill(process->pid, signum);
if (r) {
uv__set_sys_error(process->loop, errno);
return -1;
} else {
return 0;
}
}
uv_err_t uv_kill(int pid, int signum) {
int r = kill(pid, signum);
if (r) {
return uv__new_sys_error(errno);
} else {
return uv_ok_;
}
}
void uv__process_close(uv_process_t* handle) {
/* TODO stop signal watcher when this is the last handle */
ngx_queue_remove(&handle->queue);
uv__handle_stop(handle);
}
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