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io_cancel.2: Use syscall(SYS_...); for system calls without a wrapper 

In this case there's a wrapper provided by libaio,
but this page documents the raw kernel syscall.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Alejandro Colomar 2021-04-04 13:58:41 +02:00 committed by Michael Kerrisk
parent d9f8238d37
commit 0bdc3187ec
1 changed files with 6 additions and 10 deletions
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16
man2/io_cancel.2
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@ -9,14 +9,13 @@
io_cancel \- cancel an outstanding asynchronous I/O operation
.SH SYNOPSIS
.nf
.BR "#include <linux/aio_abi.h>" " /* Defines needed types */"
.BR "#include <linux/aio_abi.h>" " /* Definition of needed types */"
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.PP
.BI "int io_cancel(aio_context_t " ctx_id ", struct iocb *" iocb ,
.BI " struct io_event *" result );
.BI "int syscall(SYS_io_cancel, aio_context_t " ctx_id ", struct iocb *" iocb ,
.BI " struct io_event *" result );
.fi
.PP
.IR Note :
There is no glibc wrapper for this system call; see NOTES.
.SH DESCRIPTION
.IR Note :
this page describes the raw Linux system call interface.
@ -68,10 +67,7 @@ The asynchronous I/O system calls first appeared in Linux 2.5.
is Linux-specific and should not be used
in programs that are intended to be portable.
.SH NOTES
Glibc does not provide a wrapper for this system call.
You could invoke it using
.BR syscall (2).
But instead, you probably want to use the
You probably want to use the
.BR io_cancel ()
wrapper function provided by
.\" http://git.fedorahosted.org/git/?p=libaio.git