From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 4 Dec 2023 18:56:14 +0000 (+0100)
Subject: lib-ucode: truncate pcap files
X-Git-Url: http://git.openwrt.org/openwrt/openwrt.git%24%28if?a=commitdiff_plain;h=e259bbd49cf7b074a2ade5e62351e4e8f5fd76aa;p=project%2Fudebug.git

lib-ucode: truncate pcap files

avoid keeping stale data

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/lib-ucode.c b/lib-ucode.c
index 8e042e3..d50fd90 100644
--- a/lib-ucode.c
+++ b/lib-ucode.c
@@ -325,9 +325,10 @@ uc_udebug_pcap_file(uc_vm_t *vm, size_t nargs)
 	uc_value_t *args = uc_fn_arg(1);
 	int fd = -1;
 
-	if (ucv_type(file) == UC_STRING)
+	if (ucv_type(file) == UC_STRING) {
 		fd = open(ucv_string_get(file), O_WRONLY | O_CREAT, 0644);
-	else if (!file)
+		ftruncate(fd, 0);
+	} else if (!file)
 		fd = STDOUT_FILENO;
 
 	return uc_debug_pcap_init(fd, args);