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.\"     @(#)syscall.2	8.1 (Berkeley) 6/16/93
.\"
.\"
.\" 2002-03-20  Christoph Hellwig <hch@infradead.org>
.\"	- adopted for Linux
.\"
.\" Traducido por Miguel Pérez Ibars <mpi79470@alu.um.es> el 5-julio-2004
.\"
.Dd 16 junio 1993
.Dt SYSCALL 2
.Os BSD 4
.Sh NOMBRE
.Nm syscall
.Nd llamada al sistema indirecta
.Sh SINOPSIS
.Fd #include <sys/syscall.h>
.Fd #include <unistd.h>
.Ft int
.Fn syscall "int number" "..."
.Sh DESCRIPCIÓN
.Fn Syscall
lleva a cabo la llamada al sistema cuya interfaz con el lenguaje ensamblador
está definida por
.Fa number
con los argumentos especificados.
Las constantes simbólicas para llamadas al sistema pueden encontrarse en
el fichero de cabecera
.Ao Pa sys/syscall.h Ac .
.Sh VALOR DEVUELTO
El valor devuelto está definido por la llamada al sistema que se invoque.
En general, un valor 0 indica éxito.
Un valor -1 indica que ocurrió un error,
almacenándose un código de error en la variable
.Va errno .
.Sh FALLOS
No es posible simular llamadas al sistema que devuelven múltiples valores como
.Xr pipe 2 .
.Sh HISTORIA
La llamada a función
.Fn syscall
apareción en
.Bx 4.0 .
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