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SETPROCTITLE(3) 		   BSD Library Functions Manual 		  SETPROCTITLE(3)

     setproctitle -- set process title

     #include <sys/types.h>
     #include <unistd.h>

     setproctitle(const char *fmt, ...);

     The setproctitle() library routine sets the process title that appears on the ps(1) command.

     The title is set from the executable's name, followed by the result of a printf(3) style
     expansion of the arguments as specified by the fmt argument.  If the fmt argument begins
     with a ``-'' character, the executable's name is skipped.

     If fmt is NULL, the process title is restored.

     To set the title on a daemon to indicate its activity:

	   setproctitle("talking to %s", inet_ntoa(addr));

     ps(1), w(1), kvm(3), kvm_getargv(3), printf(3)

     The setproctitle() function is implicitly non-standard.  Other methods of causing the ps(1)
     command line to change, including copying over the argv[0] string are also implicitly non-
     portable.	It is preferable to use an operating system supplied setproctitle() if present.

     Unfortunately, it is possible that there are other calling conventions to other versions of
     setproctitle(), although none have been found by the author as yet.  This is believed to be
     the predominant convention.

     It is thought that the implementation is compatible with other systems, including NetBSD and

     The setproctitle() function first appeared in FreeBSD 2.2.  Other operating systems have
     similar functions.

     Peter Wemm <peter@FreeBSD.org> stole the idea from the Sendmail 8.7.3 source code by Eric
     Allman <eric@sendmail.org>.

     Never pass a string with user-supplied data as a format without using '%s'.  An attacker can
     put format specifiers in the string to mangle your stack, leading to a possible security
     hole.  This holds true even if the string was built using a function like snprintf(), as the
     resulting string may still contain user-supplied conversion specifiers for later interpola-
     tion by setproctitle().

     Always use the proper secure idiom:

	   setproctitle("%s", string);

BSD					December 16, 1995				      BSD
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