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	fork.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	fork.c (311B)
	---
	1 #include <u.h>
	2 #include <signal.h>
	3 #include <libc.h>
	4 #include "9proc.h"
	5 #undef fork
	6
	7 int
	8 p9fork(void)
	9 {
	10 int pid;
	11 sigset_t all, old;
	12
	13 sigfillset(&all);
	14 sigprocmask(SIG_SETMASK, &all, &old);
	15 pid = fork();
	16 if(pid == 0){
	17 _clearuproc();
	18 _p9uproc(0);
	19 }
	20 sigprocmask(SIG_SETMASK, &old, nil);
	21 return pid;
	22 }