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From: Zhangjin Wu <falcon@tinylab.org>
To: w@1wt.eu
Cc: arnd@arndb.de, falcon@tinylab.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org,
	thomas@t-8ch.de
Subject: [PATCH v2 07/13] tools/nolibc: sys_lseek: add pure 64bit lseek
Date: Tue, 30 May 2023 03:54:23 +0800	[thread overview]
Message-ID: <2f5c3338898da65210ad3f62d7b7773a96f6d251.1685387484.git.falcon@tinylab.org> (raw)
In-Reply-To: <cover.1685387484.git.falcon@tinylab.org>

use sys_llseek instead of sys_lseek to add 64bit seek even in 32bit
platforms.

This code is based on sysdeps/unix/sysv/linux/lseek.c of glibc and
src/unistd/lseek.c of musl.

Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
 tools/include/nolibc/sys.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 98cfa2f6d021..d0720af84b6d 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -672,7 +672,17 @@ int link(const char *old, const char *new)
 static __attribute__((unused))
 off_t sys_lseek(int fd, off_t offset, int whence)
 {
+#if defined(__NR_llseek) || defined(__NR__llseek)
+#ifndef __NR__llseek
+#define __NR__llseek __NR_llseek
+#endif
+	off_t result;
+	return my_syscall5(__NR__llseek, fd, offset >> 32, offset, &result, whence) ?: result;
+#elif defined(__NR_lseek)
 	return my_syscall3(__NR_lseek, fd, offset, whence);
+#else
+#error None of __NR_lseek, __NR_llseek nor __NR__llseek defined, cannot implement sys_lseek()
+#endif
 }
 
 static __attribute__((unused))
-- 
2.25.1


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  parent reply	other threads:[~2023-05-29 19:55 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-29 19:45 [PATCH v2 00/13] nolibc: add part2 of support for rv32 Zhangjin Wu
2023-05-29 19:46 ` [PATCH v2 01/13] selftests/nolibc: remove gettimeofday_bad1/2 completely Zhangjin Wu
2023-05-29 19:47 ` [PATCH v2 02/13] selftests/nolibc: support two errnos with EXPECT_SYSER2() Zhangjin Wu
2023-05-29 19:49 ` [PATCH v2 03/13] selftests/nolibc: waitpid_min: add waitid syscall support Zhangjin Wu
2023-05-29 19:50 ` [PATCH v2 04/13] tools/nolibc: add missing nanoseconds support for __NR_statx Zhangjin Wu
2023-05-29 21:39   ` Thomas Weißschuh
2023-05-30  5:21     ` Zhangjin Wu
2023-05-29 19:51 ` [PATCH v2 05/13] tools/nolibc: add more wait status related types Zhangjin Wu
2023-05-29 19:53 ` [PATCH v2 06/13] tools/nolibc: add pure 64bit off_t, time_t and blkcnt_t Zhangjin Wu
2023-05-29 19:54 ` Zhangjin Wu [this message]
2023-05-30  8:10   ` [PATCH v2 07/13] tools/nolibc: sys_lseek: add pure 64bit lseek Arnd Bergmann
2023-05-30 13:54     ` Zhangjin Wu
2023-07-02 16:28       ` Willy Tarreau
2023-05-29 19:56 ` [PATCH v2 08/13] tools/nolibc: add pure 64bit time structs Zhangjin Wu
2023-05-29 19:57 ` [PATCH v2 09/13] tools/nolibc: sys_select: add pure 64bit select Zhangjin Wu
2023-05-29 19:58 ` [PATCH v2 10/13] tools/nolibc: sys_poll: add pure 64bit poll Zhangjin Wu
2023-05-29 19:59 ` [PATCH v2 11/13] tools/nolibc: sys_gettimeofday: add pure 64bit gettimeofday Zhangjin Wu
2023-05-29 20:01 ` [PATCH v2 12/13] tools/nolibc: sys_wait4: add waitid syscall support Zhangjin Wu
2023-05-29 20:03 ` [PATCH v2 13/13] selftests/nolibc: riscv: customize makefile for rv32 Zhangjin Wu
2023-06-02  4:06   ` Zhangjin Wu
2023-06-02 10:33     ` Thomas Weißschuh
2023-06-02 11:56       ` Zhangjin Wu
2023-05-30  6:33 ` [PATCH v2 0/2] nolibc: add part3 of support " Zhangjin Wu
2023-05-30  6:37   ` [PATCH 1/2] selftests/nolibc: add new gettimeofday test cases Zhangjin Wu
2023-05-30 10:59     ` Thomas Weißschuh
2023-05-30 11:28       ` Zhangjin Wu
2023-05-30 11:54         ` Thomas Weißschuh
2023-05-30 12:05       ` Willy Tarreau
2023-05-30 12:31         ` Andreas Schwab
2023-05-30 12:35         ` Thomas Weißschuh
2023-05-30  6:42   ` [PATCH 2/2] selftests/nolibc: add sizeof test for the new 64bit data types Zhangjin Wu
2023-05-30  9:18     ` Thomas Weißschuh
2023-05-30 11:17       ` Zhangjin Wu
2023-06-02 19:44 ` [PATCH v2 00/13] nolibc: add part2 of support for rv32 Willy Tarreau

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