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Subject: setproctitle()
To: freebsd-hackers@freebsd.org
Date: Fri, 19 Jan 1996 18:11:55 +0300 (MSK)
From: "Andrew Maltsev" <am@px.f1.ru>
Organization: F1 communications
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Hi, All!

Why we have no interface to change process name in FreeBSD?
Like setproctitle() in BSD/OS and some other OS'es..

The following is my source, based on old source code from BSD/386 1.1
or 1.0.. I don't remember.

I tested it a bit.. Somebody from core team - what about to add a module
to libc.a? I'm not sure about man page - there is no BSD/OS near me to
check man's presense and copyright notices..


/************************************************************
 * setproctitle(const char *fmt, ...) - process name changer
 * Adopted for FreeBSD by Andrew Maltsev
 */
#include <stdlib.h>
#include <stdarg.h>

#include <sys/types.h>
#include <sys/param.h>
#include <vm/vm.h>
#include <sys/exec.h>

void
setproctitle(const char *fmt, ...)
{
        va_list ap;
        int n;
        char c = '\0';
        char *buf = &c;
        struct ps_strings *psp = (struct ps_strings *)PS_STRINGS;

        va_start(ap, fmt);
        n = vsnprintf(buf, 1, fmt, ap);
        va_end(ap);

        if ((buf = malloc(++n)) == 0)
                return;

        va_start(ap, fmt);
        vsnprintf(buf, n, fmt, ap);
        va_end(ap);

        psp->ps_argvstr = buf;

/* Not sure about this line - for what? But leaved as is to make it
 * compatible with BSD/OS
 */
        psp->ps_nargvstr = 1;
}

#ifdef DEBUG
main()
{ setproctitle("Wow, my pid is %d!",getpid());
  system("ps");
}
#endif

-- 
am