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#include "ccanlint.h"
#include "../tools.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <assert.h>
#include <ccan/lbalance/lbalance.h>
#include <ccan/tlist/tlist.h>
#include <ccan/time/time.h>
static struct lbalance *lb;
TLIST_TYPE(command, struct command);
static struct tlist_command pending = TLIST_INIT(pending);
static struct tlist_command running = TLIST_INIT(running);
static unsigned int num_running = 0;
static struct tlist_command done = TLIST_INIT(done);
struct command {
struct list_node list;
char *command;
pid_t pid;
int output_fd;
unsigned int time_ms;
struct lbalance_task *task;
int status;
char *output;
bool done;
const void *ctx;
};
static void killme(int sig)
{
kill(-getpid(), SIGKILL);
}
static void run_more(void)
{
struct command *c;
while (num_running < lbalance_target(lb)) {
int p[2];
c = tlist_top(&pending, list);
if (!c)
break;
fflush(stdout);
if (pipe(p) != 0)
err(1, "Pipe failed");
c->pid = fork();
if (c->pid == -1)
err(1, "Fork failed");
if (c->pid == 0) {
struct itimerval itim;
if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
|| dup2(p[1], STDERR_FILENO) != STDERR_FILENO
|| close(p[0]) != 0
|| close(STDIN_FILENO) != 0
|| open("/dev/null", O_RDONLY) != STDIN_FILENO)
exit(128);
signal(SIGALRM, killme);
itim.it_interval.tv_sec = itim.it_interval.tv_usec = 0;
itim.it_value = timespec_to_timeval(time_from_msec(c->time_ms).ts);
setitimer(ITIMER_REAL, &itim, NULL);
c->status = system(c->command);
if (WIFEXITED(c->status))
exit(WEXITSTATUS(c->status));
/* Here's a hint... */
exit(128 + WTERMSIG(c->status));
}
if (tools_verbose)
printf("Running async: %s => %i\n", c->command, c->pid);
close(p[1]);
c->output_fd = p[0];
c->task = lbalance_task_new(lb);
tlist_del_from(&pending, c, list);
tlist_add_tail(&running, c, list);
num_running++;
}
}
static void destroy_command(struct command *command)
{
if (!command->done && command->pid) {
kill(-command->pid, SIGKILL);
close(command->output_fd);
num_running--;
}
tlist_del(command, list);
}
void run_command_async(const void *ctx, unsigned int time_ms,
const char *fmt, ...)
{
struct command *command;
va_list ap;
assert(ctx);
if (!lb)
lb = lbalance_new();
command = tal(ctx, struct command);
command->ctx = ctx;
command->time_ms = time_ms;
command->pid = 0;
/* We want to track length, so don't use tal_strdup */
command->output = tal_arrz(command, char, 1);
va_start(ap, fmt);
command->command = tal_vfmt(command, fmt, ap);
va_end(ap);
tlist_add_tail(&pending, command, list);
command->done = false;
tal_add_destructor(command, destroy_command);
run_more();
}
static void reap_output(void)
{
fd_set in;
struct command *c, *next;
int max_fd = 0;
FD_ZERO(&in);
tlist_for_each(&running, c, list) {
FD_SET(c->output_fd, &in);
if (c->output_fd > max_fd)
max_fd = c->output_fd;
}
if (select(max_fd+1, &in, NULL, NULL, NULL) < 0)
err(1, "select failed");
tlist_for_each_safe(&running, c, next, list) {
if (FD_ISSET(c->output_fd, &in)) {
int old_len, len;
/* This length includes nul terminator! */
old_len = tal_count(c->output);
tal_resize(&c->output, old_len + 1024);
len = read(c->output_fd, c->output + old_len - 1, 1024);
if (len < 0)
err(1, "Reading from async command");
tal_resize(&c->output, old_len + len);
c->output[old_len + len - 1] = '\0';
if (len == 0) {
struct rusage ru;
wait4(c->pid, &c->status, 0, &ru);
if (tools_verbose)
printf("Finished async %i: %s %u\n",
c->pid,
WIFEXITED(c->status)
? "exit status"
: "killed by signal",
WIFEXITED(c->status)
? WEXITSTATUS(c->status)
: WTERMSIG(c->status));
lbalance_task_free(c->task, &ru);
c->task = NULL;
c->done = true;
close(c->output_fd);
tlist_del_from(&running, c, list);
tlist_add_tail(&done, c, list);
num_running--;
}
}
}
}
void *collect_command(bool *ok, char **output)
{
struct command *c;
const void *ctx;
while ((c = tlist_top(&done, list)) == NULL) {
if (tlist_empty(&pending) && tlist_empty(&running))
return NULL;
reap_output();
run_more();
}
*ok = (WIFEXITED(c->status) && WEXITSTATUS(c->status) == 0);
ctx = c->ctx;
*output = tal_steal(ctx, c->output);
tal_free(c);
return (void *)ctx;
}
/* Compile and link single C file, with object files, async. */
void compile_and_link_async(const void *ctx, unsigned int time_ms,
const char *cfile, const char *ccandir,
const char *objs, const char *compiler,
const char *cflags,
const char *libs, const char *outfile)
{
if (compile_verbose)
printf("Compiling and linking (async) %s\n", outfile);
run_command_async(ctx, time_ms,
"%s %s -I%s -o %s %s %s %s",
compiler, cflags,
ccandir, outfile, cfile, objs, libs);
}
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