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use sigaction(2) for signal handling

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References: http://git.suckless.org/dwm/commit/712d6639ff8e863560328131bbb92b248dc9cde7.html
This commit is contained in:
Leonardo Hernández Hernández
2022-09-28 00:54:48 -05:00
parent 8653b27692
commit f7d6a34cd9
1 changed files with 20 additions and 11 deletions
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31
dwl.c
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@@ -1885,6 +1885,8 @@ run(char *startup_cmd)
{
/* Add a Unix socket to the Wayland display. */
const char *socket = wl_display_add_socket_auto(dpy);
struct sigaction sa = {.sa_flags = SA_RESTART, .sa_handler = SIG_IGN};
sigemptyset(&sa.sa_mask);
if (!socket)
die("startup: display_add_socket_auto");
setenv("WAYLAND_DISPLAY", socket, 1);
@@ -1913,7 +1915,7 @@ run(char *startup_cmd)
close(piperw[0]);
}
/* If nobody is reading the status output, don't terminate */
signal(SIGPIPE, SIG_IGN);
sigaction(SIGPIPE, &sa, NULL);
printstatus();
/* At this point the outputs are initialized, choose initial selmon based on
@@ -2066,18 +2068,26 @@ setsel(struct wl_listener *listener, void *data)
void
setup(void)
{
struct sigaction sa_term = {.sa_flags = SA_RESTART, .sa_handler = quitsignal};
struct sigaction sa_sigchld = {
#ifdef XWAYLAND
.sa_flags = SA_RESTART,
.sa_handler = sigchld,
#else
.sa_flags = SA_NOCLDSTOP | SA_NOCLDWAIT | SA_RESTART,
.sa_handler = SIG_IGN,
#endif
};
sigemptyset(&sa_term.sa_mask);
sigemptyset(&sa_sigchld.sa_mask);
/* The Wayland display is managed by libwayland. It handles accepting
* clients from the Unix socket, manging Wayland globals, and so on. */
dpy = wl_display_create();
/* Set up signal handlers */
#ifdef XWAYLAND
sigchld(0);
#else
signal(SIGCHLD, SIG_IGN);
#endif
signal(SIGINT, quitsignal);
signal(SIGTERM, quitsignal);
sigaction(SIGCHLD, &sa_sigchld, NULL);
sigaction(SIGINT, &sa_term, NULL);
sigaction(SIGTERM, &sa_term, NULL);
/* The backend is a wlroots feature which abstracts the underlying input and
* output hardware. The autocreate option will choose the most suitable
@@ -2699,12 +2709,11 @@ sigchld(int unused)
{
siginfo_t in;
/* We should be able to remove this function in favor of a simple
* signal(SIGCHLD, SIG_IGN);
* struct sigaction sa = {.sa_handler = SIG_IGN};
* sigaction(SIGCHLD, &sa, NULL);
* but the Xwayland implementation in wlroots currently prevents us from
* setting our own disposition for SIGCHLD.
*/
if (signal(SIGCHLD, sigchld) == SIG_ERR)
die("can't install SIGCHLD handler:");
/* WNOWAIT leaves the child in a waitable state, in case this is the
* XWayland process
*/