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SYSCALL(2) BSD System Calls Manual SYSCALL(2)
syscall, __syscall -- indirect system call
syscall(int number, ...);
__syscall(quad_t 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 __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.
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
There is no way to simulate system calls that have multiple return values such as pipe(2).
The syscall() function call appeared in 4.0BSD.
4th Berkeley Distribution June 16, 1993 4th Berkeley Distribution
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