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socketcall.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 2021-05-24 20:19:47 +02:00 committed by Michael Kerrisk
parent 1b4d275a0e
commit b6687e3971
1 changed files with 9 additions and 7 deletions
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16
man2/socketcall.2
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@ -27,13 +27,18 @@
socketcall \- socket system calls socketcall \- socket system calls
.SH SYNOPSIS .SH SYNOPSIS
.nf .nf
.B #include <linux/net.h> .BR "#include <linux/net.h>" " /* Definition of " SYS_* " constants */"
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_socketcall " */"
.B #include <unistd.h>
.PP .PP
.BI "int socketcall(int " call ", unsigned long *" args ); .BI "int syscall(SYS_socketcall, int " call ", unsigned long *" args );
.fi .fi
.PP .PP
.IR Note : .IR Note :
There is no glibc wrapper for this system call; see NOTES. glibc provides no wrapper for
.BR socketcall (),
necessitating the use of
.BR syscall (2).
.SH DESCRIPTION .SH DESCRIPTION
.BR socketcall () .BR socketcall ()
is a common kernel entry point for the socket system calls. is a common kernel entry point for the socket system calls.
@ -156,10 +161,6 @@ T}
This call is specific to Linux, and should not be used in programs This call is specific to Linux, and should not be used in programs
intended to be portable. intended to be portable.
.SH NOTES .SH NOTES
Glibc does not provide a wrapper for this system call;
in the unlikely event that you want to call it directly, do so using
.BR syscall (2).
.PP
On some architectures\(emfor example, x86-64 and ARM\(emthere is no On some architectures\(emfor example, x86-64 and ARM\(emthere is no
.BR socketcall () .BR socketcall ()
system call; instead system call; instead
@ -198,3 +199,4 @@ and also provides a (very) small performance improvement.
.BR shutdown (2), .BR shutdown (2),
.BR socket (2), .BR socket (2),
.BR socketpair (2) .BR socketpair (2)