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restore SIGCHLD sighandler to default before spawning a program

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From sigaction(2):
A child created via fork(2) inherits a copy of its parent's signal dispositions.
During an execve(2), the dispositions of handled signals are reset to the default;
the dispositions of ignored signals are left unchanged.

This refused to start directly some programs from configuring in config.h:

static Key keys[] = {
	MODKEY,                       XK_o,      spawn,          {.v = cmd } },
};

Some reported programs that didn't start were: mpv, anki, dmenu_extended.

Reported by pfx.
Initial patch suggestion by Storkman.
This commit is contained in:
Hiltjo Posthuma 2023-04-09 12:37:14 +02:00
parent 348f6559ab
commit e81f17d4c1
1 changed files with 8 additions and 0 deletions
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8
dwm.c
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@ -1647,12 +1647,20 @@ showhide(Client *c)
void
spawn(const Arg *arg)
{
struct sigaction sa;
if (arg->v == dmenucmd)
dmenumon[0] = '0' + selmon->num;
if (fork() == 0) {
if (dpy)
close(ConnectionNumber(dpy));
setsid();
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = SIG_DFL;
sigaction(SIGCHLD, &sa, NULL);
execvp(((char **)arg->v)[0], (char **)arg->v);
die("dwm: execvp '%s' failed:", ((char **)arg->v)[0]);
}