From: Michal Sojka <sojkam1@fel.cvut.cz>
Date: Tue, 12 Sep 2017 11:12:39 +0000 (+0200)
Subject: utrace: Support tracing multi-threaded processes and vfork
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=commitdiff_plain;h=b416ed97c45e86595d0765efa7d3ca44246083b0;ds=inline

utrace: Support tracing multi-threaded processes and vfork

Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz>
---

diff --git a/trace/trace.c b/trace/trace.c
index f882c2e..4c25a4f 100644
--- a/trace/trace.c
+++ b/trace/trace.c
@@ -163,7 +163,9 @@ static void tracer_cb(struct uloop_process *c, int ret)
 				}
 			}
 			tracee->in_syscall = !tracee->in_syscall;
-		} else if ((ret >> 8) == (SIGTRAP | (PTRACE_EVENT_FORK << 8))) {
+		} else if ((ret >> 8) == (SIGTRAP | (PTRACE_EVENT_FORK << 8)) ||
+			   (ret >> 8) == (SIGTRAP | (PTRACE_EVENT_VFORK << 8)) ||
+			   (ret >> 8) == (SIGTRAP | (PTRACE_EVENT_CLONE << 8))) {
 			struct tracee *child = calloc(1, sizeof(struct tracee));
 
 			ptrace(PTRACE_GETEVENTMSG, c->pid, 0, &child->proc.pid);
@@ -254,7 +256,9 @@ int main(int argc, char **argv, char **envp)
 
 	ptrace(PTRACE_SETOPTIONS, child, 0,
 	       PTRACE_O_TRACESYSGOOD |
-	       PTRACE_O_TRACEFORK);
+	       PTRACE_O_TRACEFORK |
+	       PTRACE_O_TRACEVFORK |
+	       PTRACE_O_TRACECLONE);
 	ptrace(PTRACE_SYSCALL, child, 0, 0);
 
 	uloop_init();