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pivot_root.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 19:55:42 +02:00 committed by Michael Kerrisk
parent 5a24cb274f
commit 3e67d1a76b
1 changed files with 9 additions and 5 deletions
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14
man2/pivot_root.2
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@ -29,11 +29,18 @@
pivot_root \- change the root mount
.SH SYNOPSIS
.nf
.BI "int pivot_root(const char *" new_root ", const char *" put_old );
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.PP
.BI "int syscall(SYS_pivot_root, const char *" new_root \
", const char *" put_old );
.fi
.PP
.IR Note :
There is no glibc wrapper for this system call; see NOTES.
glibc provides no wrapper for
.BR pivot_root (),
necessitating the use of
.BR syscall (2).
.SH DESCRIPTION
.BR pivot_root ()
changes the root mount in the mount namespace of the calling process.
@ -168,9 +175,6 @@ was introduced in Linux 2.3.41.
.BR pivot_root ()
is Linux-specific and hence is not portable.
.SH NOTES
Glibc does not provide a wrapper for this system call; call it using
.BR syscall (2).
.PP
A command-line interface for this system call is provided by
.BR pivot_root (8).
.PP