diff mbox series

[liburing,v2,2/7] syscall: Add io_uring syscall functions

Message ID 20220830005122.885209-3-ammar.faizi@intel.com (mailing list archive)
State New
Headers show
Series Export io_uring syscall functions | expand

Commit Message

Ammar Faizi Aug. 30, 2022, 12:56 a.m. UTC 
From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

We have:

  man 2 io_uring_setup;
  man 2 io_uring_enter;
  man 2 io_uring_register;

Those entries say that io_uring syscall functions are declared in
`<linux/io_uring.h>`. But they don't actually exist and never existed.
This is causing confusion for people who read the manpage. Let's just
implement them in liburing so they exist.

This also allows the user to invoke io_uring syscalls directly instead
of using the full liburing provided setup.

v2:
  - Use consistent argument types.
  - Separate syscall declarations in liburing.h with a blank line.
  - Remove unused include in syscall.c.

Link: https://github.com/axboe/liburing/pull/646#issuecomment-1229639532
Reviewed-by: Caleb Sander <csander@purestorage.com>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 src/Makefile           |  2 +-
 src/include/liburing.h | 12 ++++++++++++
 src/liburing.map       |  4 ++++
 src/syscall.c          | 29 +++++++++++++++++++++++++++++
 4 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 src/syscall.c
diff mbox series

Patch

diff --git a/src/Makefile b/src/Makefile
index dad379d..73a98ba 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -32,7 +32,7 @@  endif
 
 all: $(all_targets)
 
-liburing_srcs := setup.c queue.c register.c
+liburing_srcs := setup.c queue.c register.c syscall.c
 
 ifeq ($(CONFIG_NOLIBC),y)
 	liburing_srcs += nolibc.c
diff --git a/src/include/liburing.h b/src/include/liburing.h
index 66c5095..6e86847 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -203,6 +203,18 @@  int io_uring_register_notifications(struct io_uring *ring, unsigned nr,
 				    struct io_uring_notification_slot *slots);
 int io_uring_unregister_notifications(struct io_uring *ring);
 
+/*
+ * io_uring syscalls.
+ */
+int io_uring_enter(unsigned int fd, unsigned int to_submit,
+		   unsigned int min_complete, unsigned int flags, sigset_t *sig);
+int io_uring_enter2(unsigned int fd, unsigned int to_submit,
+		    unsigned int min_complete, unsigned int flags,
+		    sigset_t *sig, size_t sz);
+int io_uring_setup(unsigned int entries, struct io_uring_params *p);
+int io_uring_register(unsigned int fd, unsigned int opcode, const void *arg,
+		      unsigned int nr_args);
+
 /*
  * Helper for the peek/wait single cqe functions. Exported because of that,
  * but probably shouldn't be used directly in an application.
diff --git a/src/liburing.map b/src/liburing.map
index 7d8f143..8573dfc 100644
--- a/src/liburing.map
+++ b/src/liburing.map
@@ -62,4 +62,8 @@  LIBURING_2.3 {
 		io_uring_register_file_alloc_range;
 		io_uring_register_notifications;
 		io_uring_unregister_notifications;
+		io_uring_enter;
+		io_uring_enter2;
+		io_uring_setup;
+		io_uring_register;
 } LIBURING_2.2;
diff --git a/src/syscall.c b/src/syscall.c
new file mode 100644
index 0000000..2054d17
--- /dev/null
+++ b/src/syscall.c
@@ -0,0 +1,29 @@ 
+/* SPDX-License-Identifier: MIT */
+
+#include "syscall.h"
+#include <liburing.h>
+
+int io_uring_enter(unsigned int fd, unsigned int to_submit,
+		   unsigned int min_complete, unsigned int flags, sigset_t *sig)
+{
+	return __sys_io_uring_enter(fd, to_submit, min_complete, flags, sig);
+}
+
+int io_uring_enter2(unsigned int fd, unsigned int to_submit,
+		    unsigned int min_complete, unsigned int flags,
+		    sigset_t *sig, size_t sz)
+{
+	return __sys_io_uring_enter2(fd, to_submit, min_complete, flags, sig,
+				     sz);
+}
+
+int io_uring_setup(unsigned int entries, struct io_uring_params *p)
+{
+	return __sys_io_uring_setup(entries, p);
+}
+
+int io_uring_register(unsigned int fd, unsigned int opcode, const void *arg,
+		      unsigned int nr_args)
+{
+	return __sys_io_uring_register(fd, opcode, arg, nr_args);
+}