.\" manҳȨ(C) 1999 Andi Kleen <ak@muc.de>.
.\" ޸ĵĸҳ汾ҪȨ,һֲذheader,
.\" ϴ޸ĵ,޸ߺӵheader.
.\" $Id: unix.7,v 1.1.1.1 2000/12/27 12:25:09 BitBIRD Exp $
.TH UNIX  7 "199957" "Linux ֲҳ" "LinuxԱֲ"

.SH NAME(ƣ
unix, PF_UNIX, AF_UNIX, PF_LOCAL, AF_LOCAL \- ڱڲͨѶ׽֡
.SH SYNOPSIS()
.B #include <sys/socket.h>
.br
.B #include <sys/un.h>

.IB unix_socket " = socket(PF_UNIX, type, 0);"
.br
.IB error " = socketpair(PF_UNIX, type, 0, int *" sv ");"

.SH DESCRIPTION()
.B PF_UNIX
(Ҳ
.B PF_LOCAL )
׽ͬһϵṩЧĽ̼ͨѶ.Unix ׽ֿ(
.BR socketpair (2)
), Ҳ׽ļ.
Linux ֧һֳֿռ, Ƕļϵͳ.

Ч:
.B SOCK_STREAM
׽,
.B SOCK_DGRAM
ݱ׽,ԱϢ.
Unix ׽ǿɿ,Ҳݱ.

Unix ׽ְ֧ļ̵߽֤Ϊݱĸ
ݸ̣

.SH ADDRESS FORMAT(ַʽ)
unix ַΪļϵͳеһļ
ֿ߳ռеһַ.

.BR socketpair (2)
׽.ڷ׽,Ŀַʹ
.BR connect (2)
.
صַʹ
.BR bind (2)
.
׽϶ûһصַʱ,
ԶڳֿռһΨһĵַ.

.RS
.nf
#define UNIX_PATH_MAX   108

.ta 4n 17n 42n
struct sockaddr_un {
sa_family_t     sun_family;     /* AF_UNIX */
char    sun_path[UNIX_PATH_MAX];        /* · */
};
.fi
.RE

.B sun_family
ǰ
.BR AF_UNIX .
.B sun_path
β׽ļϵͳе·.

.B sun_path
Կֽڿͷ,ָ Unix Эģάijֿռ.
׽ڴֿռеĵַ
.BR sun_path
еʣֽڸ.
עֿռֶǿֹ. 

.SH SOCKET OPTIONS(׽ѡ)
ʷԭ, Щ׽ѡͨ SOL_SOCKET ȷ,
ʹ PF_UNIX ָ.
ǿ
.BR setsockopt (2)
.
ָͨ SOL_SOCKET Ϊ׽
 
.BR getsockopt (2)
ȡ. 

.B SO_PASSCRED
ս̸Ϣ͵֤.
˸ѡ׽δʱ,
ԶһֿռΨһ.
ֵΪһʶ.

.SH ANCILLARY MESSAGES(Ϣ)
ʷԭ,ЩϢͨ SOL_SOCKET ȷ,
ʹ PF_UNIX ָ.
Ҫ, ýṹ
.B cmsghdr

.B cmsg_level
ֶΪ SOL_SOCKET, 
.B cmsg_type
ֶΪ. ҪøϢ, ο
.BR cmsg (3).

.TP
.B SCM_RIGHTS
Ϊ̷ͻһ״ļ.
ݲְһļ.
ѴļЧ
.BR dup (2)
һ.

.TP
.B SCM_CREDENTIALS
ͻ߽ unix ֤.
֤.֤
.B struct ucred
Ϣʽͣ

.RS
.nf
.ta 4n 11n 17n
struct ucred {
pid_t   pid;     /* ͽ̵Ḻ̌ʶ */
uid_t   uid;     /* ͽ̵ûʶ */
gid_t   gid;     /* ͽ̵ʶ */
};
.fi
.RE

ȷ֤ں˼.
һЧûʶ 0 Ľֵָ
ƥֵ.߱ȷḺ̌ʶ(
.BR CAP_SYS_ADMIN ),
ûʶ,Чûʶûʶ(
.BR CAP_SETUID ),
Լʶ,Чʶʶ(
.BR CAP_SETGID ).
Ϊ˽һ
.B struct ucred
Ϣ,׽ϼ
.B SO_PASSCRED
ѡ.

.SH VERSIONS(汾)
.B SCM_CREDENTIALS
ͳֿռ Linux 2.2 ,ӦҪֲijʹ.

.SH NOTES(ע)
 Linux ʵ,
ļϵͳпɼ׽ӵĿ¼Ȩ.
ǵ,Ȩ޿޸.
̲ӵжԴ׽Ŀ¼д(ִ)Ȩ,
򴴽һµ׽ֻʧ.
ִзʽ BSD չϵͳͬ,
Щϵͳ Unix ׽Ȩ.
ֲijӦڰȫ森

ļ׽ֻļϵͳдһ׽,
׽Ҫʱɵ
ɾ(ʹ
.BR unlink (2)).
ͨõ Unix ;
׽ֿκʱɾ, ҵһùرʱ,
ջļϵͳɾ.

Ҫļ֤, Ҫ/ȡһֽ.

.SH ERRORS()
.TP
.B ENOMEM
ڴ.

.TP
.B ECONNREFUSED
.BR connect (2)
һδڼ׽ֶ.
ܷԶ׽ֲڻļ׽ֵʱ.

.TP
.B EINVAL
Ч.
ͨIJԭѴַ sun_type ֶε AF_UNIX öʧ,
׽ֶӦõIJЧ״̬.

.TP
.B EOPNOTSUPP
ڷ׽ϵ,ͼʹóѡ.

.TP
.B EPROTONOSUPPORT
ݵЭǷ PF_UNIX .

.TP
.B ESOCKTNOSUPPORT
δ֪׽.

.TP
.B EPROTOTYPE
Զ׽뱾׽Ͳƥ (SOCK_DGRAM  SOCK_STREAM).

.TP
.B EADDRINUSE
ѡıصַѾռ,ļϵͳ׽ֶѾ.

.TP
.B EISCONN
һѾӵ׽ϵ
.BR connect (2)
ָĿַһӵ׽.

.TP
.B ENOTCONN
׽ֲҪһĿĵַ,׽δ.

.TP
.B ECONNRESET
Զ׽ر.
.TP
.B EPIPE
Զ׽һ׽Ϲر.,ͬʱһ
.B SIGPIPE
ʶ.ͨ
.B MSG_NOSIGNAL
ʶ
.BR sendmsg (2)

.BR recvmsg (2)
.
.TP
.B EFAULT
ûڴַЧ.
.TP
.B EPERM

.BR "struct ucred" 
дЧ֤.
.PP
һļϵͳ׽ֶʱ,
ܻͨ׽Ӳļϵͳ.
ҪøϢ,ɲμʵֲҳ.
.SH SEE ALSO()
.BR recvmsg (2),
.BR sendmsg (2),
.BR socket (2),
.BR socket (2),
.BR socketpair (2),
.BR cmsg (3),
.BR socket (7)
.SH CREDITS(βע)
manҳAndi Kleen.

.SH "[İά]"
riser Email: boomer@ccienet.com
.SH "[ݸ]"
2000/11/09

.SH "[йLinux̳manֲҳƻ]"
.TP
.BI www.cmpp.net/