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From 74b3844737b03492756b4f896c938b504b069f14 Mon Sep 17 00:00:00 2001
From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Tue, 17 Jan 2023 16:57:35 -0500
Subject: [PATCH] compat: off64_t is not defined by musl
This helps compile with latest musl, where off64_t is not defined unless
_LARGEFILE64_SOURCE is defined. On glibc, _LARGEFILE64_SOURCE is defined
if _GNU_SOURCE is defined, so the problem is only seen with musl.
Since the project uses AC_SYS_LARGEFILE, which from the autoconf doc:
"arrange for 64-bit file offsets, known as large-file support."
As such, it is safe to assume off_t is 64-bit wide. This is checked by a
static_assert to catch any platform where autoconf would let a 32-bit
off_t slip.
Upstream-Status: Submitted [https://review.lttng.org/c/lttng-tools/+/9268]
Reported-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: If2c6007a8c85bc3f3065002af8a7538b882fb4a8
---
--- a/src/common/compat/compat-fcntl.c
+++ b/src/common/compat/compat-fcntl.c
@@ -13,7 +13,7 @@
#ifdef __linux__
LTTNG_HIDDEN
-int compat_sync_file_range(int fd, off64_t offset, off64_t nbytes,
+int compat_sync_file_range(int fd, off_t offset, off_t nbytes,
unsigned int flags)
{
#ifdef HAVE_SYNC_FILE_RANGE
--- a/src/common/compat/fcntl.h
+++ b/src/common/compat/fcntl.h
@@ -8,21 +8,21 @@
#ifndef _COMPAT_FCNTL_H
#define _COMPAT_FCNTL_H
+#include <assert.h>
#include <fcntl.h>
#include <sys/types.h>
#include <common/compat/errno.h>
-#if (defined(__CYGWIN__))
-typedef long long off64_t;
-#endif
+static_assert(sizeof(off_t) == sizeof(int64_t),
+ "Build system is misconfigured, off_t must be 64-bit wide");
#if (defined(__FreeBSD__) || defined(__sun__))
typedef off64_t loff_t;
#endif
#ifdef __linux__
-extern int compat_sync_file_range(int fd, off64_t offset, off64_t nbytes,
+extern int compat_sync_file_range(int fd, off_t offset, off_t nbytes,
unsigned int flags);
#define lttng_sync_file_range(fd, offset, nbytes, flags) \
compat_sync_file_range(fd, offset, nbytes, flags)
@@ -37,8 +37,8 @@ extern int compat_sync_file_range(int fd
#define SYNC_FILE_RANGE_WAIT_BEFORE 0
#define SYNC_FILE_RANGE_WRITE 0
-static inline int lttng_sync_file_range(int fd, off64_t offset,
- off64_t nbytes, unsigned int flags)
+static inline int lttng_sync_file_range(int fd, off_t offset,
+ off_t nbytes, unsigned int flags)
{
return -ENOSYS;
}
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