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