PROFIL(2)

NAME
       profil - execution time profile

SYNOPSIS
       #include <<unistd.h>>

       int profil(char *buf, int bufsiz, int offset, int scale);

DESCRIPTION
       Under Linux 0.99.11, profil is not implemented in the ker-
       nel.  Instead, the DLL 4.4.1  libraries  provide  a  user-
       space implementation.

       Buf points to bufsiz bytes of core.  Every virtual 10 mil-
       liseconds, the user's program counter  (PC)  is  examined:
       offset  is  subtracted  and  the  result  is multiplied by
       scale.  If this address is in buf, then the  word  pointed
       to is incremented.

       If  scale  is  less than 2 or bufsiz is zero, profiling is
       disabled.

RETURN VALUE
       Zero is always returned.

BUGS
       profil  cannot  be  used  on  a  program  that  also  uses
       ITIMER_PROF  itimers.   Calling profil with an invalid buf
       will result in a core dump.

       True kernel profiling provides more accurate results.

CONFORMING TO
       Similar to a call in SVr4 (but not POSIX.1).  However,  in
       the  SVr4  version the first argument is short *, allowing
       higher counter values.

SEE ALSO
       gprof(1) setitimer(2) signal(2) sigaction(2)