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common/spawn.c: add spawn_piped()

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Consolatis 2024-03-18 06:15:15 +01:00 • committed by Johan Malm
parent 0671a3bfd3
commit e5488fefcb
3 changed files with 180 additions and 6 deletions
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61
src/server.c
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@ -2,6 +2,7 @@
#define _POSIX_C_SOURCE 200809L
#include "config.h"
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include <wlr/backend/headless.h>
#include <wlr/backend/multi.h>
@ -42,6 +43,7 @@ static struct wlr_compositor *compositor;
static struct wl_event_source *sighup_source;
static struct wl_event_source *sigint_source;
static struct wl_event_source *sigterm_source;
static struct wl_event_source *sigchld_source;
static struct server *g_server;
@ -83,6 +85,63 @@ handle_sigterm(int signal, void *data)
return 0;
}
static int
handle_sigchld(int signal, void *data)
{
siginfo_t info;
info.si_pid = 0;
/* First call waitid() with NOWAIT which doesn't consume the zombie */
if (waitid(P_ALL, /*id*/ 0, &info, WEXITED | WNOHANG | WNOWAIT) == -1) {
return 0;
}
if (info.si_pid == 0) {
/* No children in waitable state */
return 0;
}
#if HAVE_XWAYLAND
/* Verify that we do not break xwayland lazy initialization */
struct server *server = data;
if (server->xwayland && server->xwayland->server
&& info.si_pid == server->xwayland->server->pid) {
return 0;
}
#endif
/* And then do the actual (consuming) lookup again */
int ret = waitid(P_PID, info.si_pid, &info, WEXITED);
if (ret == -1) {
wlr_log(WLR_ERROR, "blocking waitid() for %ld failed: %d",
(long)info.si_pid, ret);
return 0;
}
switch (info.si_code) {
case CLD_EXITED:
wlr_log(info.si_status == 0 ? WLR_DEBUG : WLR_ERROR,
"spawned child %ld exited with %d",
(long)info.si_pid, info.si_status);
break;
case CLD_KILLED:
case CLD_DUMPED:
; /* works around "a label can only be part of a statement" */
const char *signame = strsignal(info.si_status);
wlr_log(WLR_ERROR,
"spawned child %ld terminated with signal %d (%s)",
(long)info.si_pid, info.si_status,
signame ? signame : "unknown");
break;
default:
wlr_log(WLR_ERROR,
"spawned child %ld terminated unexpectedly: %d"
" please report", (long)info.si_pid, info.si_code);
}
return 0;
}
static void
seat_inhibit_input(struct seat *seat, struct wl_client *active_client)
{
@ -239,6 +298,8 @@ server_init(struct server *server)
event_loop, SIGINT, handle_sigterm, server->wl_display);
sigterm_source = wl_event_loop_add_signal(
event_loop, SIGTERM, handle_sigterm, server->wl_display);
sigchld_source = wl_event_loop_add_signal(
event_loop, SIGCHLD, handle_sigchld, server);
server->wl_event_loop = event_loop;
/*