NAME

       profil - execution time profile

SYNOPSIS

       #include <unistd.h>

       int profil(u_short *buf, size_t bufsiz, size_t offset, u_int scale);

DESCRIPTION

       This  routine  provides  a  means  to  find  out  in what areas your program spends most of its time. The
       argument buf points to bufsiz bytes of core.  Every virtual 10 milliseconds, the user's  program  counter
       (PC)  is  examined:  offset is subtracted and the result is multiplied by scale and divided by 65536.  If
       the resulting value is less than bufsiz, then the corresponding entry in buf is incremented.  If  buf  is
       NULL, profiling is disabled.

RETURN VALUE

       Zero is always returned.

BUGS

       profil cannot be used on a program that also uses ITIMER_PROF itimers.

       True  kernel  profiling  provides  more  accurate results.  Libc 4.4 contained a kernel patch providing a
       system call profil.

CONFORMING TO

       Similar to a call in SVr4 (but not POSIX.1).

SEE ALSO

       gprof(1), setitimer(2), signal(2), sigaction(2)