trace.c revision 1b9cfd6ad305ad909e8ff17139111a7c78f01464 
1#include <stdio.h>
2#include <string.h>
3#include <errno.h>
4#include <sys/types.h>
5#include <sys/ptrace.h>
6#include <asm/unistd.h>
7
8#include "ltrace.h"
9#include "options.h"
10
11/* Returns 1 if the sysnum may make a new child to be created
12 * (ie, with fork() or clone())
13 * Returns 0 otherwise.
14 */
15int fork_p(int sysnum)
16{
17	return 0
18#if defined(__NR_fork)
19		|| (sysnum == __NR_fork)
20#endif
21#if defined(__NR_clone)
22		|| (sysnum == __NR_clone)
23#endif
24#if defined(__NR_vfork)
25		|| (sysnum == __NR_vfork)
26#endif
27		;
28}
29
30/* Returns 1 if the sysnum may make the process exec other program
31 */
32int exec_p(int sysnum)
33{
34	return (sysnum == __NR_execve);
35}
36
37void trace_me(void)
38{
39	if (ptrace(PTRACE_TRACEME, 0, 1, 0)<0) {
40		perror("PTRACE_TRACEME");
41		exit(1);
42	}
43}
44
45int trace_pid(pid_t pid)
46{
47	if (ptrace(PTRACE_ATTACH, pid, 1, 0) < 0) {
48		return -1;
49	}
50	return 0;
51}
52
53void untrace_pid(pid_t pid)
54{
55	ptrace(PTRACE_DETACH, pid, 1, 0);
56}
57
58void continue_after_signal(pid_t pid, int signum)
59{
60	/* We should always trace syscalls to be able to control fork(), clone(), execve()... */
61#if 0
62	if (opt_S) {
63		ptrace(PTRACE_SYSCALL, pid, 1, signum);
64	} else {
65		ptrace(PTRACE_CONT, pid, 1, signum);
66	}
67#else
68	ptrace(PTRACE_SYSCALL, pid, 1, signum);
69#endif
70}
71
72void continue_process(pid_t pid)
73{
74	continue_after_signal(pid, 0);
75}
76
77void continue_enabling_breakpoint(pid_t pid, struct breakpoint * sbp)
78{
79	insert_breakpoint(pid, sbp);
80	continue_process(pid);
81}
82