SETPROCTITLE(3)

NAME
setproctitle - set process title

LIBRARY
libc

SYNOPSIS
#include <stdlib.h>
void
setproctitle(const char *fmt, ...);

DESCRIPTION
The setproctitle() function sets the invoking process's title. The process title is set to the last component of the program name, followed by a colon and the formatted string specified by fmt. If fmt is NULL, the colon and formatted string are omitted. The length of a process title is limited to 2048 bytes.

EXAMPLES
Set the process title to the program name, with no further information:

    setproctitle(NULL);

Set the process title to the program name, an informational string, and the process id:

    setproctitle("foo! (%d)", getpid());

SEE ALSO
ps(1), w(1), getprogname(3), printf(3)

HISTORY
The setproctitle() function first appeared in NetBSD 1.0.

CAVEATS
It is important never to 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 you have built the string “by hand” using a function like snprintf(), as the resulting string may still contain user-supplied conversion specifiers for later interpolation by setproctitle().

Always be sure to use the proper secure idiom:

    setproctitle("%s", string);