restore SIGCHLD sighandler to default before spawning a program
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.
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dwm.c
8
dwm.c
@ -1647,12 +1647,20 @@ showhide(Client *c)
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void
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spawn(const Arg *arg)
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{
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struct sigaction sa;
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if (arg->v == dmenucmd)
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dmenumon[0] = '0' + selmon->num;
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if (fork() == 0) {
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if (dpy)
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close(ConnectionNumber(dpy));
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setsid();
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = SIG_DFL;
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sigaction(SIGCHLD, &sa, NULL);
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execvp(((char **)arg->v)[0], (char **)arg->v);
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die("dwm: execvp '%s' failed:", ((char **)arg->v)[0]);
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}
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