[unix-history] / usr / man / man2 / syscall.2

.TH SYSCALL 2 "12 February 1983"
.UC 4
.SH NAME
syscall \- indirect system call
.SH SYNOPSIS
.nf
.BR "syscall(number, arg, ...)" \  \  (VAX-11)
.fi
.SH DESCRIPTION
.I Syscall
performs the system call whose assembly language
interface has the specified
.I number,
register arguments
.I r0
and
.I r1
and further arguments
.IR arg .
.PP
The r0 value of the system call is returned.
.SH DIAGNOSTICS
When the C-bit is set,
.I syscall
returns \-1 and sets the
external variable 
.I errno
(see
.IR intro (2)).
.SH BUGS
There is no way to simulate system calls
such as
.IR pipe (2),
which return values in register r1.
Commit	Line	Data
c30b2987 C	1	.TH SYSCALL 2 "12 February 1983"
	2	.UC 4
	3	.SH NAME
	4	syscall \- indirect system call
	5	.SH SYNOPSIS
	6	.nf
	7	.BR "syscall(number, arg, ...)" \ \ (VAX-11)
	8	.fi
	9	.SH DESCRIPTION
	10	.I Syscall
	11	performs the system call whose assembly language
	12	interface has the specified
	13	.I number,
	14	register arguments
	15	.I r0
	16	and
	17	.I r1
	18	and further arguments
	19	.IR arg .
	20	.PP
	21	The r0 value of the system call is returned.
	22	.SH DIAGNOSTICS
	23	When the C-bit is set,
	24	.I syscall
	25	returns \-1 and sets the
	26	external variable
	27	.I errno
	28	(see
	29	.IR intro (2)).
	30	.SH BUGS
	31	There is no way to simulate system calls
	32	such as
	33	.IR pipe (2),
	34	which return values in register r1.