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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
.SH SYNOPSIS
.nf
.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.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 int " whence );
.fi
.PP
.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
Note: for information about the
.BR llseek (3)
@ -97,10 +101,7 @@ is invalid.
This function 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.
To invoke it directly, use
.BR syscall (2).
However, you probably want to use the
You probably want to use the
.BR lseek (2)
wrapper function instead.
.SH SEE ALSO