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    Command:

    profil

    
    
    
    

    SYNOPSIS

         #include <unistd.h>
    
         int
         profil(char *samples, size_t size, vm_offset_t offset, int scale);
    
    
    

    DESCRIPTION

         The profil() system call enables or disables program counter profiling of
         the current process.  If profiling is enabled, then at every profiling
         clock tick, the kernel updates an appropriate count in the samples
         buffer.  The frequency of the profiling clock is recorded in the header
         in the profiling output file.
    
         The buffer samples contains size bytes and is divided into a series of
         16-bit bins.  Each bin counts the number of times the program counter was
         in a particular address range in the process when a profiling clock tick
         occurred while profiling was enabled.  For a given program counter
         address, the number of the corresponding bin is given by the relation:
    
               [(pc - offset) / 2] * scale / 65536
    
         The offset argument is the lowest address at which the kernel takes pro-
         gram counter samples.  The scale argument ranges from 1 to 65536 and can
         be used to change the span of the bins.  A scale of 65536 maps each bin
         to 2 bytes of address range; a scale of 32768 gives 4 bytes, 16384 gives
         8 bytes and so on.  Intermediate values provide approximate intermediate
         ranges.  A scale value of 0 disables profiling.
    
    
    

    RETURN VALUES

         The profil() function returns the value 0 if successful; otherwise the
         value -1 is returned and the global variable errno is set to indicate the
         error.
    
    
    

    FILES

         /usr/lib/gcrt0.o  profiling C run-time startup file
         gmon.out          conventional name for profiling output file
    
    
    

    ERRORS

         The following error may be reported:
    
         [EFAULT]           The buffer samples contains an invalid address.
    
    
    

    SEE ALSO

         gprof(1)
    
    
    

    HISTORY

         The profil() function appeared in Version 7 AT&T UNIX.
    
    
    

    BUGS

         This routine should be named profile().
    
    
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