From 6cbc4ce87f19972007b689078aceb54014106fae Mon Sep 17 00:00:00 2001
From: Adrian Muzyka <adrian.muzyka@consult.red>
Date: Wed, 20 Sep 2023 08:54:56 +0200
Subject: [PATCH] Ignore ptrace(PTRACE_SEIZE) error on ESRCH (No such process)

---
 memcr.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/memcr.c b/memcr.c
index 6f77dd7..c292ebd 100644
--- a/memcr.c
+++ b/memcr.c
@@ -448,7 +448,12 @@ static int seize_pid(pid_t pid)
 
 	ret = ptrace(PTRACE_SEIZE, pid, NULL, 0);
 	if (ret) {
-		fprintf(stderr, "ptrace(PTRACE_SEIZE) pid %d: %m\n", pid);
+		if (errno == ESRCH) {
+			fprintf(stderr, "ptrace(PTRACE_SEIZE) pid %d: %m, ignoring\n", pid);
+			return 0;
+		}
+
+		fprintf(stderr, "ptrace(PTRACE_SEIZE) %d pid %d: %m\n", errno, pid);
 		return 1;
 	}