2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
11 #include <sys/signal.h>
14 #include "kern_util.h"
18 void (*pre_exec)(void*);
24 /* Debugging aid, changed only from gdb */
27 static void helper_hup(int sig)
31 static int helper_child(void *arg)
33 struct helper_data *data = arg;
34 char **argv = data->argv;
38 signal(SIGHUP, helper_hup);
41 if(data->pre_exec != NULL)
42 (*data->pre_exec)(data->pre_data);
43 execvp(argv[0], argv);
45 printk("execvp of '%s' failed - errno = %d\n", argv[0], errno);
46 os_write_file(data->fd, &errval, sizeof(errval));
47 os_kill_process(os_getpid(), 0);
51 /* XXX The alloc_stack here breaks if this is called in the tracing thread */
53 int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
54 unsigned long *stack_out)
56 struct helper_data data;
57 unsigned long stack, sp;
58 int pid, fds[2], err, n;
60 if((stack_out != NULL) && (*stack_out != 0))
62 else stack = alloc_stack(0, um_in_interrupt());
66 err = os_pipe(fds, 1, 0);
68 printk("run_helper : pipe failed, err = %d\n", -err);
72 err = os_set_exec_close(fds[1], 1);
74 printk("run_helper : setting FD_CLOEXEC failed, err = %d\n",
79 sp = stack + page_size() - sizeof(void *);
80 data.pre_exec = pre_exec;
81 data.pre_data = pre_data;
84 pid = clone(helper_child, (void *) sp, CLONE_VM | SIGCHLD, &data);
86 printk("run_helper : clone failed, errno = %d\n", errno);
91 os_close_file(fds[1]);
92 n = os_read_file(fds[0], &err, sizeof(err));
94 printk("run_helper : read on pipe failed, err = %d\n", -n);
99 waitpid(pid, NULL, 0);
103 if(stack_out == NULL) free_stack(stack, 0);
104 else *stack_out = stack;
108 os_kill_process(pid, 1);
110 os_close_file(fds[0]);
111 os_close_file(fds[1]);
113 free_stack(stack, 0);
117 int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
118 unsigned long *stack_out, int stack_order)
120 unsigned long stack, sp;
123 stack = alloc_stack(stack_order, um_in_interrupt());
124 if(stack == 0) return(-ENOMEM);
126 sp = stack + (page_size() << stack_order) - sizeof(void *);
127 pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
129 printk("run_helper_thread : clone failed, errno = %d\n",
133 if(stack_out == NULL){
134 pid = waitpid(pid, &status, 0);
136 printk("run_helper_thread - wait failed, errno = %d\n",
140 if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
141 printk("run_helper_thread - thread returned status "
143 free_stack(stack, stack_order);
145 else *stack_out = stack;
149 int helper_wait(int pid, int block)
153 ret = waitpid(pid, NULL, WNOHANG);
155 printk("helper_wait : waitpid failed, errno = %d\n", errno);
162 * Overrides for Emacs so that we follow Linus's tabbing style.
163 * Emacs will notice this stuff at the end of the file and automatically
164 * adjust the settings for this buffer only. This must remain at the end
166 * ---------------------------------------------------------------------------
168 * c-file-style: "linux"