tfork.c - plan9port - [fork] Plan 9 from user space
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       ---
       tfork.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 }