NAME

     setproctitle — set process title

LIBRARY

     library “libbsd”

SYNOPSIS

     #include <sys/types.h>
     #include <unistd.h>
     (See libbsd(7) for include usage.)

     void
     setproctitle_init(int argc, char *argv[], char *envp[]);

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

DESCRIPTION

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

     The setproctitle_init() library routine only needs to be called (before any call to setproctitle() and with
     main() arguments), if the automatic constructor support has not been linked in through the libbsd-ctor pkg-
     config file.

     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.

EXAMPLES

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

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

SEE ALSO

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

STANDARDS

     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 BSD/OS.

HISTORY

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

     The setproctitle_init() function is a libbsd extension not present on the BSDs, avoid using it in portable
     code.

AUTHORS

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

BUGS

     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 interpolation by setproctitle().

     Always use the proper secure idiom:

           setproctitle("%s", string);