Index for Section 3

Alphabetical listing for C

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clock(3)
NAME
  clock - Reports CPU time used

LIBRARY
  Standard C Library (libc.so, libc.a)

SYNOPSIS
  #include <time.h>

  clock_t clock (void);

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  clock():  XPG4, XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  The clock() function reports the amount of processor time used by the
  calling process and each of its terminated child processes for which a wait
  function has been executed. When a child process does not wait for its
  children, its child-process times are not included in its times.

RETURN VALUES
  The clock() function returns the amount of processor time (in microseconds)
  used since the first call to clock().	 To convert the time to seconds,
  divide it by CLOCKS_PER_SEC (which is defined to be 1,000,000 in <time.h>).
  If the processor time used is not available or its value cannot be
  represented, the clock() function returns (clock_t)-1.

RELATED INFORMATION
  Functions: ctime(3), getrusage(2), times(3), wait(2)

  Standards: standards(5)

Index for Section 3

Alphabetical listing for C

Top of page