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Add debug output in initial attachment code

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* strace.c (startup_attach): If -d, report pid and success/failure
  of every attach attempt.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2011-06-24 16:51:16 +02:00
parent 1d5f12ecb8
commit f95397afb8
1 changed files with 16 additions and 7 deletions
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23
strace.c
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@ -471,13 +471,20 @@ startup_attach(void)
if (tid <= 0)
continue;
++ntid;
if (ptrace(PTRACE_ATTACH, tid, (char *) 1, 0) < 0)
if (ptrace(PTRACE_ATTACH, tid, (char *) 1, 0) < 0) {
++nerr;
else if (tid != tcbtab[tcbi]->pid) {
tcp = alloctcb(tid);
tcp->flags |= TCB_ATTACHED|TCB_CLONE_THREAD;
tcbtab[tcbi]->nclone_threads++;
tcp->parent = tcbtab[tcbi];
if (debug)
fprintf(stderr, "attach to pid %d failed\n", tid);
}
else {
if (debug)
fprintf(stderr, "attach to pid %d succeeded\n", tid);
if (tid != tcbtab[tcbi]->pid) {
tcp = alloctcb(tid);
tcp->flags |= TCB_ATTACHED|TCB_CLONE_THREAD;
tcbtab[tcbi]->nclone_threads++;
tcp->parent = tcbtab[tcbi];
}
}
if (interactive) {
sigprocmask(SIG_SETMASK, &empty_set, NULL);
@ -508,6 +515,8 @@ startup_attach(void)
droptcb(tcp);
continue;
}
if (debug)
fprintf(stderr, "attach to pid %d (main) succeeded\n", tcp->pid);
/* INTERRUPTED is going to be checked at the top of TRACE. */
if (daemonized_tracer) {
@ -528,7 +537,7 @@ startup_attach(void)
fprintf(stderr,
"Process %u attached - interrupt to quit\n",
tcp->pid);
}
} /* for each tcbtab[] */
if (interactive)
sigprocmask(SIG_SETMASK, &empty_set, NULL);