/// Tries to start a new job.
///
/// @param[out] status The job id if the job started successfully, 0 if the job
/// table is full, -1 if the program could not be executed.
/// @return The job pointer if the job started successfully, NULL otherwise
Job *job_start(JobOptions opts, int *status)
{
int i;
Job *job;
// Search for a free slot in the table
for (i = 0; i < MAX_RUNNING_JOBS; i++) {
if (table[i] == NULL) {
break;
}
}
if (i == MAX_RUNNING_JOBS) {
// No free slots
shell_free_argv(opts.argv);
*status = 0;
return NULL;
}
job = xmalloc(sizeof(Job));
// Initialize
job->id = i + 1;
*status = job->id;
job->status = -1;
job->refcount = 1;
job->stopped_time = 0;
job->term_sent = false;
job->in = NULL;
job->out = NULL;
job->err = NULL;
job->opts = opts;
job->closed = false;
process_init(job);
if (opts.writable) {
handle_set_job((uv_handle_t *)job->proc_stdin, job);
job->refcount++;
}
if (opts.stdout_cb) {
handle_set_job((uv_handle_t *)job->proc_stdout, job);
job->refcount++;
}
if (opts.stderr_cb) {
handle_set_job((uv_handle_t *)job->proc_stderr, job);
job->refcount++;
}
// Spawn the job
if (!process_spawn(job)) {
if (opts.writable) {
uv_close((uv_handle_t *)job->proc_stdin, close_cb);
}
if (opts.stdout_cb) {
uv_close((uv_handle_t *)job->proc_stdout, close_cb);
}
if (opts.stderr_cb) {
uv_close((uv_handle_t *)job->proc_stderr, close_cb);
}
process_close(job);
event_poll(0);
// Manually invoke the close_cb to free the job resources
*status = -1;
return NULL;
}
if (opts.writable) {
job->in = wstream_new(opts.maxmem);
wstream_set_stream(job->in, job->proc_stdin);
}
// Start the readable streams
if (opts.stdout_cb) {
job->out = rstream_new(read_cb, rbuffer_new(JOB_BUFFER_SIZE), job);
rstream_set_stream(job->out, job->proc_stdout);
rstream_start(job->out);
}
if (opts.stderr_cb) {
job->err = rstream_new(read_cb, rbuffer_new(JOB_BUFFER_SIZE), job);
rstream_set_stream(job->err, job->proc_stderr);
rstream_start(job->err);
}
// Save the job to the table
table[i] = job;
return job;
}
int job_start(char **argv,
void *data,
rstream_cb stdout_cb,
rstream_cb stderr_cb,
job_exit_cb job_exit_cb)
{
int i;
Job *job;
// Search for a free slot in the table
for (i = 0; i < MAX_RUNNING_JOBS; i++) {
if (table[i] == NULL) {
break;
}
}
if (i == MAX_RUNNING_JOBS) {
// No free slots
return 0;
}
job = xmalloc(sizeof(Job));
// Initialize
job->id = i + 1;
job->pending_refs = 3;
job->pending_closes = 4;
job->data = data;
job->stdout_cb = stdout_cb;
job->stderr_cb = stderr_cb;
job->exit_cb = job_exit_cb;
job->stopped = false;
job->exit_timeout = EXIT_TIMEOUT;
job->proc_opts.file = argv[0];
job->proc_opts.args = argv;
job->proc_opts.stdio = job->stdio;
job->proc_opts.stdio_count = 3;
job->proc_opts.flags = UV_PROCESS_WINDOWS_HIDE;
job->proc_opts.exit_cb = exit_cb;
job->proc_opts.cwd = NULL;
job->proc_opts.env = NULL;
job->proc.data = NULL;
job->proc_stdin.data = NULL;
job->proc_stdout.data = NULL;
job->proc_stderr.data = NULL;
// Initialize the job std{in,out,err}
uv_pipe_init(uv_default_loop(), &job->proc_stdin, 0);
job->stdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE;
job->stdio[0].data.stream = (uv_stream_t *)&job->proc_stdin;
uv_pipe_init(uv_default_loop(), &job->proc_stdout, 0);
job->stdio[1].flags = UV_CREATE_PIPE | UV_WRITABLE_PIPE;
job->stdio[1].data.stream = (uv_stream_t *)&job->proc_stdout;
uv_pipe_init(uv_default_loop(), &job->proc_stderr, 0);
job->stdio[2].flags = UV_CREATE_PIPE | UV_WRITABLE_PIPE;
job->stdio[2].data.stream = (uv_stream_t *)&job->proc_stderr;
// Spawn the job
if (uv_spawn(uv_default_loop(), &job->proc, &job->proc_opts) != 0) {
free_job(job);
return -1;
}
// Give all handles a reference to the job
handle_set_job((uv_handle_t *)&job->proc, job);
handle_set_job((uv_handle_t *)&job->proc_stdin, job);
handle_set_job((uv_handle_t *)&job->proc_stdout, job);
handle_set_job((uv_handle_t *)&job->proc_stderr, job);
job->in = wstream_new(JOB_WRITE_MAXMEM);
wstream_set_stream(job->in, (uv_stream_t *)&job->proc_stdin);
// Start the readable streams
job->out = rstream_new(read_cb, JOB_BUFFER_SIZE, job, true);
job->err = rstream_new(read_cb, JOB_BUFFER_SIZE, job, true);
rstream_set_stream(job->out, (uv_stream_t *)&job->proc_stdout);
rstream_set_stream(job->err, (uv_stream_t *)&job->proc_stderr);
rstream_start(job->out);
rstream_start(job->err);
// Save the job to the table
table[i] = job;
// Start polling job status if this is the first
if (job_count == 0) {
uv_prepare_start(&job_prepare, job_prepare_cb);
}
job_count++;
return job->id;
}