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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)