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syscall(2) -- Linux man page
NAME
syscall
- indirect system call
SYNOPSIS
Fd #include <sys/syscall.h>
Fd #include <unistd.h>
Ft int
Fn syscall int number ...
DESCRIPTION
Fn Syscall
performs the system call whose assembly language
interface has the specified
Fa number
with the specified arguments.
Symbolic constants for system calls can be found in the header file
Ao Pa sys/syscall.h Ac .
RETURN VALUES
The return value is defined by the system call being invoked.
In general, a 0 return value indicates success.
A -1 return value indicates an error,
and an error code is stored in
errno
BUGS
There is no way to simulate system calls that have multiple return values
such as
pipe(2).
HISTORY
The
Fn syscall
function call appeared in
BSD 4.0
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