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

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 2021-05-10 19:55:20 +02:00 committed by Michael Kerrisk
parent e3e30ce1bd
commit 2f4306b033
1 changed files with 9 additions and 7 deletions
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16
man2/kcmp.2
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@ -30,14 +30,19 @@
kcmp \- compare two processes to determine if they share a kernel resource
.SH SYNOPSIS
.nf
.B #include <linux/kcmp.h>
.BR "#include <linux/kcmp.h>" " /* Definition of " KCMP_* " constants */"
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.PP
.BI "int kcmp(pid_t " pid1 ", pid_t " pid2 ", int " type ,
.BI " unsigned long " idx1 ", unsigned long " idx2 );
.BI "int syscall(SYS_kcmp, pid_t " pid1 ", pid_t " pid2 ", int " type ,
.BI " unsigned long " idx1 ", unsigned long " idx2 );
.fi
.PP
.IR Note :
There is no glibc wrapper for this system call; see NOTES.
glibc provides no wrapper for
.BR kcmp (),
necessitating the use of
.BR syscall (2).
.SH DESCRIPTION
The
.BR kcmp ()
@ -303,9 +308,6 @@ system call first appeared in Linux 3.5.
.BR kcmp ()
is Linux-specific and should not be used in programs intended to be portable.
.SH NOTES
Glibc does not provide a wrapper for this system call; call it using
.BR syscall (2).
.PP
Before Linux 5.12,
this system call is available only if the kernel is configured with
.BR CONFIG_CHECKPOINT_RESTORE ,