diff mbox series

[liburing,v3,02/10] arch: syscall: Add `__sys_open()` syscall

Message ID 20220704174858.329326-3-ammar.faizi@intel.com (mailing list archive)
State New
Headers show
Series aarch64 support | expand

Commit Message

Ammar Faizi July 4, 2022, 5:54 p.m. UTC 
From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

A prep patch to support aarch64 nolibc. We will use this to get the
page size by reading /proc/self/auxv. For some reason __NR_open is
not defined, so also define it in aarch64 syscall specific file.

v3:
  - Use __NR_openat if __NR_open is not defined.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 src/arch/generic/syscall.h |  9 +++++++++
 src/arch/syscall-defs.h    | 14 ++++++++++++++
 2 files changed, 23 insertions(+)

Comments

Alviro Iskandar Setiawan July 4, 2022, 6:07 p.m. UTC | #1 
On Tue, Jul 5, 2022 at 12:54 AM Ammar Faizi wrote:
> From: Ammar Faizi <ammarfaizi2@gnuweeb.org>
>
> A prep patch to support aarch64 nolibc. We will use this to get the
> page size by reading /proc/self/auxv. For some reason __NR_open is
> not defined, so also define it in aarch64 syscall specific file.
>
> v3:
>   - Use __NR_openat if __NR_open is not defined.
>
> Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>

Reviewed-by: Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>

tq

-- Viro
diff mbox series

Patch

diff --git a/src/arch/generic/syscall.h b/src/arch/generic/syscall.h
index fa93064..71b2234 100644
--- a/src/arch/generic/syscall.h
+++ b/src/arch/generic/syscall.h
@@ -7,6 +7,8 @@ 
 #ifndef LIBURING_ARCH_GENERIC_SYSCALL_H
 #define LIBURING_ARCH_GENERIC_SYSCALL_H
 
+#include <fcntl.h>
+
 static inline int ____sys_io_uring_register(int fd, unsigned opcode,
 					    const void *arg, unsigned nr_args)
 {
@@ -41,6 +43,13 @@  static inline int ____sys_io_uring_enter(int fd, unsigned to_submit,
 				       _NSIG / 8);
 }
 
+static inline int __sys_open(const char *pathname, int flags, mode_t mode)
+{
+	int ret;
+	ret = open(pathname, flags, mode);
+	return (ret < 0) ? -errno : ret;
+}
+
 static inline void *__sys_mmap(void *addr, size_t length, int prot, int flags,
 			       int fd, off_t offset)
 {
diff --git a/src/arch/syscall-defs.h b/src/arch/syscall-defs.h
index 1e8ae1b..9d4424d 100644
--- a/src/arch/syscall-defs.h
+++ b/src/arch/syscall-defs.h
@@ -3,6 +3,20 @@ 
 #ifndef LIBURING_ARCH_SYSCALL_DEFS_H
 #define LIBURING_ARCH_SYSCALL_DEFS_H
 
+#include <fcntl.h>
+
+static inline int __sys_open(const char *pathname, int flags, mode_t mode)
+{
+	/*
+ 	 * Some architectures don't have __NR_open, but __NR_openat.
+ 	 */
+#ifdef __NR_open
+	return __do_syscall3(__NR_open, pathname, flags, mode);
+#else
+	return __do_syscall4(__NR_openat, AT_FDCWD, pathname, flags, mode);
+#endif
+}
+
 static inline void *__sys_mmap(void *addr, size_t length, int prot, int flags,
 			       int fd, off_t offset)
 {