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Full Discussion: running C program to output in multiple locations
Top Forums Shell Programming and Scripting running C program to output in multiple locations Post 302562825 by Corona688 on Saturday 8th of October 2011 12:48:11 PM
Old 10-08-2011
You'll have to save a file so you can tell if it's been run before and, if not, how many times.

Code:
int runcount(void)
{
        int count=0;
        FILE *fp;
        char path[512];
        const char *homedir=getenv("HOME");

        if(homedir == NULL) return(-1); // If HOME isn't set, we can't find the file!

        // set path to /home/username/.myprogram
        sprintf(path, "%s/.myprogram");
        fp=fopen(path, "w+"); // open .myprogram for reading and writing
        if(fp == NULL) // return a nonsense value if something goes wrong
                return(-1);

        // read a number.  If the file's empty, count will stay zero.
        fscanf(fp, "%d", &count);
        // seek back to the start of the file.
        fseek(fp, 0L, SEEK_SET);
        // overwrite it with count+1.  count+1 will always be a longer
        // string than count so this is safe.
        fprintf(fp, "%d", count+1);
        fclose(fp);
        return(count);
}

 

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LEARN ABOUT REDHAT

pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-x] [-o omitpid] [-o omitpid..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o     Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

NOTES

       pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin.

       When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is  possible  that
       it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)
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