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Top Forums Programming How to Run a Linux Command and Redirect its output to a socket in C Post 302256048 by fpmurphy on Friday 7th of November 2008 06:55:15 PM
Old 11-07-2008
No, there is no way of directly outputting to the client socket. You need to modify your code to loop until no more data is available i.e. fgets() returns NULL. Using ls as an example, here is some pseudo code which should point you in the right direction:

Code:
FILE *fp;
char path[PATH_MAX];
...
fp = popen("ls", "r");
while (fgets(path, PATH_MAX, fp) != NULL) {
    # fprintf(stderr, "%s", path);
    write(sockfd, path, strlen(path));   
}

pclose(fp);   
...

You could also look at the source code for rexecd for inspiration.
 

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LYXCLIENT(1)							  lyxclient 1.6.5						      LYXCLIENT(1)

NAME
lyxclient - send commands to a running LyX editor SYNOPSIS
lyxclient [ options ] DESCRIPTION
When LyX starts, it creates a unique, per-process local socket in the temporary directory through which commands can be sent. That is, it can act like a server, accepting connections from clients. lyxclient can be used as such client. lyxclient will take care of all connection and communication protocol details, leaving you (or your app) free to concentrate on what you want to send to LyX. SERVER IDENTIFICATION OPTIONS
lyxclient must first identify to which server (i.e. a running LyX) commands are to be sent. The following options are used to specify the server. -p pid specify the pid of the running LyX process to which lyxclient should send commands. -a socket_address specify explicitly which socket special file should be used. These special files are located inside lyx_tmpdir<lyx_pid><hash>, in the temporary directory. There is one per running LyX process. -t tmp_dir if LyX is configured to use a temporary directory other than /tmp, you must inform lyxclient of this. If neither -a nor -p are invoked, lyxclient will search for sockets in /tmp (or tmp_dir if the -t option is used) and use the first socket to which it can connect. This is safe if you are running only one LyX process at any one time. COMMAND MODE OPTIONS
lyxclient can send commands to LyX from both the command-line and from standard input. LyX commands documentation can be found in LyX Help menu. -c command send a single command, print LyX information to standard output and exit. LYXCMD prefix is needed in the given command. -g file line this is simply a wrapper for the command 'server-goto-file-row file line'. It is used by the DVI previewer to elicit inverse DVI search. If neither -c nor -g are used, lyxclient will regard any standard input as commands to be sent to LyX, printing LyX's responses to standard output. Commands are separated by newlines (the ' ' character). To finish communication and terminate the lyxclient process, send the com- mand 'BYE:'. MISCELANEOUS OPTIONS
-n name when starting communication, lyxclient sends an idenfifier string to LyX. By default, this string is "PPID>PID", where PPID is lyx- client's parent pid and pid is lyxclient's pid. Use this option to override this default. -h print the lyxclient version and summarize its usage. ENVIRONMENT
LYXSOCKET can be used to specify the socket special file that must be used. LyX sets this variable. It is overridden by the -a option. SEE ALSO
lyx(1), xdvi(1), LFUNs.lyx. AUTHORS
Joao Luis M. Assirati <assirati@fma.if.usp.br> is the principal author of lyxclient. Version 1.6.5 2009-12-05 LYXCLIENT(1)
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