pid_t h2o_spawnp(const char *cmd, char *const *argv, const int *mapped_fds, int cloexec_mutex_is_locked)
{
#if defined(__linux__)
/* posix_spawnp of Linux does not return error if the executable does not exist, see
* https://gist.github.com/kazuho/0c233e6f86d27d6e4f09
*/
extern char **environ;
int pipefds[2] = {-1, -1}, errnum;
pid_t pid;
/* create pipe, used for sending error codes */
if (pipe2(pipefds, O_CLOEXEC) != 0)
goto Error;
/* fork */
if (!cloexec_mutex_is_locked)
pthread_mutex_lock(&cloexec_mutex);
if ((pid = fork()) == 0) {
/* in child process, map the file descriptors and execute; return the errnum through pipe if exec failed */
if (mapped_fds != NULL) {
for (; *mapped_fds != -1; mapped_fds += 2) {
if (mapped_fds[1] != -1)
dup2(mapped_fds[0], mapped_fds[1]);
close(mapped_fds[0]);
}
}
char **env = build_spawn_env();
if (env != NULL)
environ = env;
execvp(cmd, argv);
errnum = errno;
write(pipefds[1], &errnum, sizeof(errnum));
_exit(EX_SOFTWARE);
}
if (!cloexec_mutex_is_locked)
pthread_mutex_unlock(&cloexec_mutex);
if (pid == -1)
goto Error;
/* parent process */
close(pipefds[1]);
pipefds[1] = -1;
ssize_t rret;
errnum = 0;
while ((rret = read(pipefds[0], &errnum, sizeof(errnum))) == -1 && errno == EINTR)
;
if (rret != 0) {
/* spawn failed */
while (waitpid(pid, NULL, 0) != pid)
;
pid = -1;
errno = errnum;
goto Error;
}
/* spawn succeeded */
close(pipefds[0]);
return pid;
Error:
errnum = errno;
if (pipefds[0] != -1)
close(pipefds[0]);
if (pipefds[1] != -1)
close(pipefds[1]);
errno = errnum;
return -1;
#elif defined _MSC_VER //-- : process : https://msdn.microsoft.com/en-us/library/20y988d2.aspx
pid_t pid;
extern char** environ;
uv_loop_t *loop;
uv_process_t child_req;
uv_process_options_t options = { 0 }; //-- Default initialization must be 0
loop = uv_default_loop();
//-- Container for file descruptor
uv_stdio_container_t child_stdio[3];
child_stdio[0].flags = UV_IGNORE;
child_stdio[1].flags = UV_INHERIT_FD; //STD_OUT should be redirected to calling function
child_stdio[2].flags = UV_IGNORE;
if (mapped_fds != NULL) {
for (; *mapped_fds != -1; mapped_fds += 2) {
if (mapped_fds[1] != -1)
//dup2(mapped_fds[0], mapped_fds[1]); //Equivalent to dup2() in *inx systems.
child_stdio[1].data.fd = mapped_fds[0]; //2 or 1?
//close(mapped_fds[0]); //add or delete a close or open action to a spawn file actions object
}
}
if (!cloexec_mutex_is_locked)
uv_mutex_lock(&cloexec_mutex);
options.stdio = child_stdio;
options.exit_cb = waitpid; //This function will be executed when child exists.
options.file = cmd;
options.args = argv;
options.env = environ;
//If the process is successfully spawned, this function will return 0.
errno = uv_spawn(loop, &child_req, &options);
pid = child_req.pid;
if (!cloexec_mutex_is_locked)
uv_mutex_unlock(&cloexec_mutex);
if (errno != 0)
return -1;
return pid;
#else
posix_spawn_file_actions_t file_actions;
pid_t pid;
extern char **environ;
char **env = build_spawn_env();
posix_spawn_file_actions_init(&file_actions);
if (mapped_fds != NULL) {
for (; *mapped_fds != -1; mapped_fds += 2) {
if (mapped_fds[1] != -1)
posix_spawn_file_actions_adddup2(&file_actions, mapped_fds[0], mapped_fds[1]);
posix_spawn_file_actions_addclose(&file_actions, mapped_fds[0]);
}
}
if (!cloexec_mutex_is_locked)
pthread_mutex_lock(&cloexec_mutex);
errno = posix_spawnp(&pid, cmd, &file_actions, NULL, argv, env != NULL ? env : environ);
if (!cloexec_mutex_is_locked)
pthread_mutex_unlock(&cloexec_mutex);
free(env);
if (errno != 0)
return -1;
return pid;
#endif
}
pid_t h2o_spawnp(const char *cmd, char *const *argv, const int *mapped_fds, int cloexec_mutex_is_locked)
{
#if defined(__linux__)
/* posix_spawnp of Linux does not return error if the executable does not exist, see
* https://gist.github.com/kazuho/0c233e6f86d27d6e4f09
*/
extern char **environ;
int pipefds[2] = {-1, -1}, errnum;
pid_t pid;
/* create pipe, used for sending error codes */
if (pipe2(pipefds, O_CLOEXEC) != 0)
goto Error;
/* fork */
if (!cloexec_mutex_is_locked)
pthread_mutex_lock(&cloexec_mutex);
if ((pid = fork()) == 0) {
/* in child process, map the file descriptors and execute; return the errnum through pipe if exec failed */
if (mapped_fds != NULL) {
for (; *mapped_fds != -1; mapped_fds += 2) {
if (mapped_fds[1] != -1)
dup2(mapped_fds[0], mapped_fds[1]);
close(mapped_fds[0]);
}
}
char **env = build_spawn_env();
if (env != NULL)
environ = env;
execvp(cmd, argv);
errnum = errno;
write(pipefds[1], &errnum, sizeof(errnum));
_exit(EX_SOFTWARE);
}
if (!cloexec_mutex_is_locked)
pthread_mutex_unlock(&cloexec_mutex);
if (pid == -1)
goto Error;
/* parent process */
close(pipefds[1]);
pipefds[1] = -1;
ssize_t rret;
errnum = 0;
while ((rret = read(pipefds[0], &errnum, sizeof(errnum))) == -1 && errno == EINTR)
;
if (rret != 0) {
/* spawn failed */
while (waitpid(pid, NULL, 0) != pid)
;
pid = -1;
errno = errnum;
goto Error;
}
/* spawn succeeded */
close(pipefds[0]);
return pid;
Error:
errnum = errno;
if (pipefds[0] != -1)
close(pipefds[0]);
if (pipefds[1] != -1)
close(pipefds[1]);
errno = errnum;
return -1;
#else
posix_spawn_file_actions_t file_actions;
pid_t pid;
extern char **environ;
char **env = build_spawn_env();
posix_spawn_file_actions_init(&file_actions);
if (mapped_fds != NULL) {
for (; *mapped_fds != -1; mapped_fds += 2) {
if (mapped_fds[1] != -1)
posix_spawn_file_actions_adddup2(&file_actions, mapped_fds[0], mapped_fds[1]);
posix_spawn_file_actions_addclose(&file_actions, mapped_fds[0]);
}
}
if (!cloexec_mutex_is_locked)
pthread_mutex_lock(&cloexec_mutex);
errno = posix_spawnp(&pid, cmd, &file_actions, NULL, argv, env != NULL ? env : environ);
if (!cloexec_mutex_is_locked)
pthread_mutex_unlock(&cloexec_mutex);
free(env);
if (errno != 0)
return -1;
return pid;
#endif
}
