restore SIGCHLD sighandler to default before spawning a program e81f17d4 
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.
Hiltjo Posthuma · 2023-04-09 12:37 1 file(s) · +8 −0
dwm.c +8 −0
1647 1647 
void
1648 1648 
spawn(const Arg *arg)
1649 1649 
{
1650 + 
	struct sigaction sa;
1651 + 

            

            
            

                1650
                1652
                 
                
	if (arg->v == dmenucmd)

            

            
            

                1651
                1653
                 
                
		dmenumon[0] = '0' + selmon->num;

            

            
            

                1652
                1654
                 
                
	if (fork() == 0) {

            

            
            

                1653
                1655
                 
                
		if (dpy)

            

            
            

                1654
                1656
                 
                
			close(ConnectionNumber(dpy));

            

            
            

                1655
                1657
                 
                
		setsid();

            

            
            

                
                1658
                +
                

            

            
            

                
                1659
                +
                
		sigemptyset(&sa.sa_mask);

            

            
            

                
                1660
                +
                
		sa.sa_flags = 0;

            

            
            

                
                1661
                +
                
		sa.sa_handler = SIG_DFL;

            

            
            

                
                1662
                +
                
		sigaction(SIGCHLD, &sa, NULL);

            

            
            

                
                1663
                +
                

            

            
            

                1656
                1664
                 
                
		execvp(((char **)arg->v)[0], (char **)arg->v);

            

            
            

                1657
                1665
                 
                
		die("dwm: execvp '%s' failed:", ((char **)arg->v)[0]);

            

            
            

                1658
                1666
                 
                
	}