depot/third_party/nixpkgs/pkgs/os-specific/linux/lvm2/fix-stdio-usage.patch

From 63b1c7332bee6080bffecf9ce9d75ff15d799166 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Wed, 16 Nov 2022 10:42:39 +0100
Subject: [PATCH] fix stdio usage

---
 lib/commands/toolcontext.c | 4 ++--
 tools/lvmcmdline.c         | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/commands/toolcontext.c b/lib/commands/toolcontext.c
index b630554a9..f20080d18 100644
--- a/lib/commands/toolcontext.c
+++ b/lib/commands/toolcontext.c
@@ -1667,7 +1667,7 @@ struct cmd_context *create_toolcontext(unsigned is_clvmd,
 	/* FIXME Make this configurable? */
 	reset_lvm_errno(1);
 
-#ifndef VALGRIND_POOL
+#if !defined(VALGRIND_POOL) && defined(__GLIBC__)
 	/* Set in/out stream buffering before glibc */
 	if (set_buffering
 #ifdef SYS_gettid
@@ -2045,7 +2045,7 @@ void destroy_toolcontext(struct cmd_context *cmd)
 		dm_hash_destroy(cmd->cft_def_hash);
 
 	dm_device_list_destroy(&cmd->cache_dm_devs);
-#ifndef VALGRIND_POOL
+#if !defined(VALGRIND_POOL) && defined(__GLIBC__)
 	if (cmd->linebuffer) {
 		/* Reset stream buffering to defaults */
 		if (is_valid_fd(STDIN_FILENO) &&
diff --git a/tools/lvmcmdline.c b/tools/lvmcmdline.c
index a5bb6a5c5..0ebfa375c 100644
--- a/tools/lvmcmdline.c
+++ b/tools/lvmcmdline.c
@@ -3422,7 +3422,7 @@ static int _check_standard_fds(void)
 	int err = is_valid_fd(STDERR_FILENO);
 
 	if (!is_valid_fd(STDIN_FILENO) &&
-	    !(stdin = fopen(_PATH_DEVNULL, "r"))) {
+	    !freopen(_PATH_DEVNULL, "r", stdin)) {
 		if (err)
 			perror("stdin stream open");
 		else
@@ -3432,7 +3432,7 @@ static int _check_standard_fds(void)
 	}
 
 	if (!is_valid_fd(STDOUT_FILENO) &&
-	    !(stdout = fopen(_PATH_DEVNULL, "w"))) {
+	    !freopen(_PATH_DEVNULL, "w", stdout)) {
 		if (err)
 			perror("stdout stream open");
 		/* else no stdout */
@@ -3440,7 +3440,7 @@ static int _check_standard_fds(void)
 	}
 
 	if (!is_valid_fd(STDERR_FILENO) &&
-	    !(stderr = fopen(_PATH_DEVNULL, "w"))) {
+	    !freopen(_PATH_DEVNULL, "w", stderr)) {
 		printf("stderr stream open: %s\n",
 		       strerror(errno));
 		return 0;
-- 
2.38.1