#include <bits/signal.h>

#include <syscall.h>

#define WNOHANG 1 /* Don't block waiting. */

#define WUNTRACED 2 /* Report stopped child. */

#define WCONTINUED 8 /* Report continued child. */

#define WEXITSTATUS(status) (((status) & 0xFF00) >> 8)

#define WTERMSIG(status) ((status) & 0x7F)

#define WIFEXITED(status) (WTERMSIG(status) == 0)

#define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))

#define WIFSTOPPED(status) (((status) & 0xFF) == 0x7F)

#define WIFCONTINUED(status) ((status) == 0xFFFF)

inline static long sys_fork(void)

{

return syscall5(NR_clone, SIGCHLD, 0, 0, 0, 0);

}

inline static long sys_execve(const char* exe, char** argv, char** envp)

{

return syscall3(NR_execve, (long)exe, (long)argv, (long)envp);

}

inline static long sys_waitpid(int pid, int* status, int flags)

{

return syscall4(NR_wait4, pid, (long)status, flags, 0);

}