nsz Git - musl/blob - src/process/fork.c

   1 #include <unistd.h>
   2 #include <string.h>
   3 #include "syscall.h"
   4 #include "libc.h"
   5 #include "pthread_impl.h"
   6
   7 static void dummy(int x)
   8 {
   9 }
  10
  11 weak_alias(dummy, __fork_handler);
  12
  13 pid_t fork(void)
  14 {
  15         pid_t ret;
  16         sigset_t set;
  17         __fork_handler(-1);
  18         __block_all_sigs(&set);
  19         ret = syscall(SYS_fork);
  20         if (libc.main_thread && !ret) {
  21                 pthread_t self = __pthread_self();
  22                 self->tid = self->pid = syscall(SYS_getpid);
  23                 memset(&self->robust_list, 0, sizeof self->robust_list);
  24                 libc.threads_minus_1 = 0;
  25                 libc.main_thread = self;
  26         }
  27         __restore_sigs(&set);
  28         __fork_handler(!ret);
  29         return ret;
  30 }