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llseek.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 19:55:26 +02:00 committed by Michael Kerrisk
parent f1d0eaf52b
commit aecad91d0b
1 changed files with 7 additions and 6 deletions
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13
man2/llseek.2
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@ -31,15 +31,19 @@
_llseek \- reposition read/write file offset _llseek \- reposition read/write file offset
.SH SYNOPSIS .SH SYNOPSIS
.nf .nf
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
.B #include <unistd.h> .B #include <unistd.h>
.PP .PP
.BI "int _llseek(unsigned int " fd ", unsigned long " offset_high , .BI "int syscall(SYS__llseek, unsigned int " fd ", unsigned long " offset_high ,
.BI " unsigned long " offset_low ", loff_t *" result , .BI " unsigned long " offset_low ", loff_t *" result ,
.BI " unsigned int " whence ); .BI " unsigned int " whence );
.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 _llseek (),
necessitating the use of
.BR syscall (2).
.SH DESCRIPTION .SH DESCRIPTION
Note: for information about the Note: for information about the
.BR llseek (3) .BR llseek (3)
@ -97,10 +101,7 @@ is invalid.
This function is Linux-specific, and should not be used in programs This function is Linux-specific, 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. You probably want to use the
To invoke it directly, use
.BR syscall (2).
However, you probably want to use the
.BR lseek (2) .BR lseek (2)
wrapper function instead. wrapper function instead.
.SH SEE ALSO .SH SEE ALSO