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(The comments found at the beginning of the groff file "man2/syscall.2freebsd".)
- indirect system call
Fn syscall int number ...
Fn __syscall quad_t number ...
performs the system call whose assembly language
interface has the specified
with the specified arguments.
Symbolic constants for system calls can be found in the header file
In sys/syscall.h .
form should be used when one or more of the arguments 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 in
function appeared in
There is no way to simulate system calls that have multiple return values