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OpenDarwin 7.2.1 - man page for __syscall (opendarwin section 2)

SYSCALL(2)			     BSD System Calls Manual			       SYSCALL(2)

NAME
     syscall, __syscall -- indirect system call

SYNOPSIS
     #include <sys/syscall.h>
     #include <unistd.h>

     int
     syscall(int number, ...);

     int
     __syscall(quad_t number, ...);

DESCRIPTION
     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 __syscall form should be used when one or more of the
     parameters is a 64-bit argument to ensure that argument alignment is correct.  This system
     call is useful for testing new system calls that do not have entries in the C library.

RETURN VALUES
     The return values are 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 syscall() function call appeared in 4.0BSD.

4th Berkeley Distribution		  June 16, 1993 		4th Berkeley Distribution


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