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Manual Reference Pages  - SYSCALL (2)

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syscall - indirect system call

CONTENTS

Synopsis
Description
Return Values
Bugs
History

.Fd #include <sys/syscall.h>
.Fd #include <unistd.h> int syscall int number ...

Syscall performs the system call whose assembly language interface has the specified number with the specified arguments. Symbolic constants for system calls can be found in the header file <sys/syscall.h>.

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.

There is no way to simulate system calls that have multiple return values such as pipe(2).

The syscall function call appeared in BSD 4.0 .

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