fusl/src/process/fork.c

#include <unistd.h>
#include <string.h>
#include <signal.h>
#include "syscall.h"
#include "libc.h"
#include "pthread_impl.h"

static void dummy(int x) {}

weak_alias(dummy, __fork_handler);

pid_t fork(void) {
  pid_t ret;
  sigset_t set;
  __fork_handler(-1);
  __block_all_sigs(&set);
#ifdef SYS_fork
  ret = syscall(SYS_fork);
#else
  ret = syscall(SYS_clone, SIGCHLD, 0);
#endif
  if (!ret) {
    pthread_t self = __pthread_self();
    self->tid = __syscall(SYS_gettid);
    self->robust_list.off = 0;
    self->robust_list.pending = 0;
    libc.threads_minus_1 = 0;
  }
  __restore_sigs(&set);
  __fork_handler(!ret);
  return ret;
}