June 4, 1993 CLOCK 3

### NAME

clock - determine processor time used

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```clock_t` clock(```void`)

### DESCRIPTION

The clock(``) function determines the amount of processor time used since the invocation of the calling process, measured in ```CLOCKS_PER_SEC`s.

### RETURN VALUES

The clock(``) function returns the amount of time used unless an error occurs, in which case the return value is -1.

### SEE ALSO

getrusage(2)

### STANDARDS

The clock(``) function conforms to ANSI X3.159-1989 (``ANSI C89'') .