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

   1 #include <unistd.h>
   2 #include <string.h>
   3 #include <signal.h>
   4 #include "syscall.h"
   5 #include "libc.h"
   6 #include "pthread_impl.h"
   7
   8 static void dummy(int x)
   9 {
  10 }
  11
  12 weak_alias(dummy, __fork_handler);
  13
  14 pid_t fork(void)
  15 {
  16         pid_t ret;
  17         sigset_t set;
  18         __fork_handler(-1);
  19         __block_all_sigs(&set);
  20 #ifdef SYS_fork
  21         ret = syscall(SYS_fork);
  22 #else
  23         ret = syscall(SYS_clone, SIGCHLD, 0);
  24 #endif
  25         if (libc.has_thread_pointer && !ret) {
  26                 pthread_t self = __pthread_self();
  27                 self->tid = self->pid = __syscall(SYS_getpid);
  28                 memset(&self->robust_list, 0, sizeof self->robust_list);
  29                 libc.threads_minus_1 = 0;
  30         }
  31         __restore_sigs(&set);
  32         __fork_handler(!ret);
  33         return ret;
  34 }