| /* |
| * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <sched.h> |
| #include <sys/wait.h> |
| #include <sys/ptrace.h> |
| #include "user.h" |
| #include "kern_util.h" |
| #include "os.h" |
| #include "time_user.h" |
| |
| static int user_thread_tramp(void *arg) |
| { |
| if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) |
| panic("user_thread_tramp - PTRACE_TRACEME failed, " |
| "errno = %d\n", errno); |
| enable_timer(); |
| os_stop_process(os_getpid()); |
| return(0); |
| } |
| |
| int user_thread(unsigned long stack, int flags) |
| { |
| int pid, status; |
| |
| pid = clone(user_thread_tramp, (void *) stack_sp(stack), |
| flags | CLONE_FILES | SIGCHLD, NULL); |
| if(pid < 0){ |
| printk("user_thread - clone failed, errno = %d\n", errno); |
| return(pid); |
| } |
| |
| if(waitpid(pid, &status, WUNTRACED) < 0){ |
| printk("user_thread - waitpid failed, errno = %d\n", errno); |
| return(-errno); |
| } |
| |
| if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)){ |
| printk("user_thread - trampoline didn't stop, status = %d\n", |
| status); |
| return(-EINVAL); |
| } |
| |
| return(pid); |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-file-style: "linux" |
| * End: |
| */ |