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Full Discussion: Redirect stdin and out to sockets
Top Forums Programming Redirect stdin and out to sockets Post 302231452 by otheus on Tuesday 2nd of September 2008 10:30:40 AM
Old 09-02-2008
Sorry, why are you creating a socket connection? Why don't you use pipe the output of the command back to the user?
Quote:
For Linux I've tried to mimic the shell using popen(), and to write and read in the handler returned by popen(), but I cannot run /bash shell commands as cd, cp, mkdir and so on because they are internal bin/bash commands
Hunh? If you use popen, the only limitation is that you cannot both read from and write into the file descriptor. Only if that limitation is a problem do you need sockets. But you say you can't run them because they are "internal commands". But there almost always external versions of these commands available. (For cd, however, it's useless -- you must do this within the context of your program, or prefix all subsequent commands with a "cd".) Regardless, all one needs to do in this case is run bash and provide it the command to parse.

Code:
fd=popen("/bin/bash -c \"cd /tmp; echo *\"","r");

 

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LEARN ABOUT NETBSD

sockstat

SOCKSTAT(1)						    BSD General Commands Manual 					       SOCKSTAT(1)

NAME

     sockstat -- list open sockets

SYNOPSIS

     sockstat [-46clnu] [-f address_family] [-p ports]

DESCRIPTION

     The sockstat command lists open Internet or UNIX domain sockets.

     The following options are available:

     -4 	 Show AF_INET (IPv4) sockets.

     -6 	 Show AF_INET6 (IPv6) sockets.

     -c 	 Show connected sockets.

     -f address_family
		 Limit listed sockets to those of the specified address_family.  The following address families are recognized: inet, for AF_INET;
		 inet6, for AF_INET6; and local or unix, for AF_LOCAL.

     -l 	 Show listening sockets.

     -n 	 Numeric output only.  No attempt will be made to look up symbolic names for addresses and ports.

     -p ports	 Only show Internet sockets if either the local or foreign port number is on the specified list.  The ports argument is a comma-
		 separated list of port numbers and ranges specified as first and last port separated by a dash.

     -u 	 Show AF_LOCAL (UNIX) sockets.

     If neither -4, -6, nor -u are specified, sockstat will list sockets in all three domains.

     If neither -c nor -l are specified, sockstat will list both listening and connected sockets, as well as those sockets that are in neither
     state.

     The information listed for each socket is:

     USER	      The user who owns the socket.

     COMMAND	      The command which holds the socket.

     PID	      The process ID of the command which holds the socket.

     FD 	      The file descriptor number of the socket.

     PROTO	      The transport protocol associated with the socket for Internet sockets, or the type of socket (stream, seqpacket or data-
		      gram) for UNIX sockets.

     LOCAL ADDRESS    For Internet sockets, this is the address to which the local end of the socket is bound (see getsockname(2)).  For bound
		      UNIX sockets, it is the socket's filename or ``-''.

     FOREIGN ADDRESS  The address to which the foreign end of the socket is bound (see getpeername(2)) or ``-'' for unconnected UNIX sockets.

SEE ALSO

     fstat(1), netstat(1), inet(4), inet6(4), unix(4)

HISTORY

     The sockstat command appeared in FreeBSD 3.1.  It was then rewritten for NetBSD 3.0.

AUTHORS

     This version of the sockstat command was written by Andrew Brown <atatat@NetBSD.org>.  This manual page was written by Dag-Erling Smorgrav
     <des@FreeBSD.org> and was adapted to match the NetBSD implementation by Andrew Brown <atatat@NetBSD.org>.

BSD
								   July 14, 2006							       BSD
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