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

Explain also why headers are needed.
And some ffix.

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 19:55:48 +02:00 committed by Michael Kerrisk
parent 71b08c22b5
commit fac7dabcd1
1 changed files with 7 additions and 5 deletions
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12
man2/reboot.2
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@ -30,21 +30,23 @@
reboot \- reboot or enable/disable Ctrl-Alt-Del
.SH SYNOPSIS
.nf
/* Since kernel version 2.1.30 there are symbolic names LINUX_REBOOT_*
.RB "/* Since kernel version 2.1.30 there are symbolic names " LINUX_REBOOT_*
for the constants and a fourth argument to the call: */
.PP
.BR "#include <linux/reboot.h> " \
"/* Definition of " LINUX_REBOOT_* " constants */"
.BR "#include <sys/syscall.h> " "/* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.B #include <linux/reboot.h>
.PP
.BI "int reboot(int " magic ", int " magic2 ", int " cmd ", void *" arg );
.BI "int syscall(SYS_reboot, int " magic ", int " magic2 ", int " cmd ", void *" arg );
.PP
/* Under glibc and most alternative libc's (including uclibc, dietlibc,
musl and a few others), some of the constants involved have gotten
symbolic names RB_*, and the library call is a 1-argument
.RB " symbolic names " RB_* ", and the library call is a 1-argument"
wrapper around the system call: */
.PP
.BR "#include <sys/reboot.h> " "/* Definition of " RB_* " constants */"
.B #include <unistd.h>
.B #include <sys/reboot.h>
.PP
.BI "int reboot(int " cmd );
.fi