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rexec(3SOCKET)		   Sockets Library Functions		rexec(3SOCKET)

NAME
       rexec, rexec_af - return	stream to a remote command

SYNOPSIS
       cc [ flag ... ] file... -lsocket	-lnsl [	library... ]
       #include	<netdb.h>
       #include	<unistd.h>

       int  rexec(char **ahost,	unsigned short inport, const char *user, const
       char *passwd, const char	*cmd, int *fd2p);

       int rexec_af(char **ahost, unsigned short  inport,  const  char	*user,
       const char *passwd, const char *cmd, int	*fd2p, int af);

DESCRIPTION
       The  rexec()  and  rexec_af()  functions	 look  up the host ahost using
       getaddrinfo(3SOCKET) and	return -1 if the host does not exist.	Other-
       wise  ahost  is	set to the standard name of the	host. The username and
       password	are used in remote host	authentication.	 When a	 username  and
       password	 are  not specified, the .netrc	file in	the user's home	direc-
       tory is searched	for the	appropriate information.  If the search	fails,
       the user	is prompted for	the information.

       The  rexec()  function  always  returns a socket	of the AF_INET address
       family. The rexec_af() function supports	AF_INET, AF_INET6,  or	AF_UN-
       SPEC  for  the  address family. An application can choose which type of
       socket is returned by passing AF_INET or	AF_INET6 as the	 address  fam-
       ily. The	use of AF_UNSPEC means that the	caller will accept any address
       family. Choosing	AF_UNSPEC provides a socket that best suits  the  con-
       nectivity to the	remote host.

       The port	inport specifies which DARPA Internet port to use for the con-
       nection.	The port number	used must be in	network	byte  order,  as  sup-
       plied  by  a  call to htons(3XNET).  The	protocol for connection	is de-
       scribed in detail in in.rexecd(1M).

       If the call succeeds, a socket of type SOCK_STREAM is returned  to  the
       caller, and given to the	remote command as its standard input and stan-
       dard output. If fd2p is non-zero, an auxiliary  channel	to  a  control
       process	is set up and a	file descriptor	for it is placed in *fd2p. The
       control process returns diagnostic output (file descriptor 2), from the
       command	on  the	 auxiliary  channel.  The control process also accepts
       bytes on	this channel as	signal numbers to be forwarded to the  process
       group of	the command. If	fd2p is	0, the standard	error (file descriptor
       2) of the remote	command	is made	the same as its	 standard  output.  No
       provision  is made for sending arbitrary	signals	to the remote process,
       other than possibly sending out-of-band data.

       There is	no way to specify options to the socket()  call	 made  by  the
       rexec() or rexec_af()functions.

RETURN VALUES
       If rexec() succeeds, a file descriptor number is	returned of the	socket
       type SOCK_STREAM	and the	address	family AF_INET.	The  parameter	*ahost
       is  set to the standard name of the host. If the	value of fd2p is other
       than NULL, a file descriptor number is placed in	*fd2p which represents
       the standard error stream of the	command.

       If rexec_af() succeeds, the routine returns a file descriptor number of
       the socket type SOCK_STREAM in the address family AF_INET or  AF_INET6,
       as determined by	the value of the af parameter.

       If either rexec() or rexec_af() fails, -1 is returned.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

       This  interface	is Unsafe in multithreaded applications. Unsafe	inter-
       faces should be called only from	the main thread.

SEE ALSO
       in.rexecd(1M),  getaddrinfo(3SOCKET),  gethostbyname(3NSL),  getservby-
       name(3SOCKET), htons(3XNET), socket(3SOCKET), attributes(5)

SunOS 5.10			  10 Feb 2004			rexec(3SOCKET)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO

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