getrusage man page on BSDi

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GETRUSAGE(2)		    BSD Programmer's Manual		  GETRUSAGE(2)

NAME
     getrusage - get information about resource utilization

SYNOPSIS
     #include <sys/types.h>
     #include <sys/time.h>
     #include <sys/resource.h>

     int
     getrusage(int who, struct rusage *rusage);

DESCRIPTION
     Getrusage() returns information describing the resources used by the cur-
     rent process, or by all of its terminated child processes.

     The who parameter is either:

     RUSAGE_SELF
	  Returns information describing the resources used by the current
	  process.

     RUSAGE_CHILDREN
	  Returns information describing the resources used by all of the cur-
	  rent processes terminated children.

     The buffer to which rusage points will be filled in with the following
     structure:

     struct rusage {
	     struct timeval ru_utime; /* user time used */
	     struct timeval ru_stime; /* system time used */
	     long ru_maxrss;	      /* integral max resident set size */
	     long ru_ixrss;	      /* integral shared text memory size */
	     long ru_idrss;	      /* integral unshared data size */
	     long ru_isrss;	      /* integral unshared stack size */
	     long ru_minflt;	      /* page reclaims */
	     long ru_majflt;	      /* page faults */
	     long ru_nswap;	      /* swaps */
	     long ru_inblock;	      /* block input operations */
	     long ru_oublock;	      /* block output operations */
	     long ru_msgsnd;	      /* messages sent */
	     long ru_msgrcv;	      /* messages received */
	     long ru_nsignals;	      /* signals received */
	     long ru_nvcsw;	      /* voluntary context switches */
	     long ru_nivcsw;	      /* involuntary context switches */
     };

     The fields are interpreted as follows:

     ru_utime	  the total amount of time spent executing in user mode.

     ru_stime	  the total amount of time spent in the system executing on
		  behalf of the process(es).

     ru_maxrss	  the maximum resident set size utilized (in kilobytes).

     ru_ixrss	  an integral value indicating the amount of memory used by
		  the text segment that was also shared among other processes.
		  This value is expressed in units of kilobytes * ticks-of-ex-
		  ecution.

     ru_idrss	  an integral value of the amount of unshared memory residing
		  in the data segment of a process (expressed in units of

		  kilobytes * ticks-of-execution).

     ru_isrss	  an integral value of the amount of unshared memory residing
		  in the stack segment of a process (expressed in units of
		  kilobytes * ticks-of-execution).

     ru_minflt	  the number of page faults serviced without any I/O activity;
		  here I/O activity is avoided by reclaiming a page frame from
		  the list of pages awaiting reallocation.

     ru_majflt	  the number of page faults serviced that required I/O activi-
		  ty.

     ru_nswap	  the number of times a process was swapped out of main memo-
		  ry.

     ru_inblock	  the number of times the file system had to perform input.

     ru_oublock	  the number of times the file system had to perform output.

     ru_msgsnd	  the number of IPC messages sent.

     ru_msgrcv	  the number of IPC messages received.

     ru_nsignals  the number of signals delivered.

     ru_nvcsw	  the number of times a context switch resulted due to a pro-
		  cess voluntarily giving up the processor before its time
		  slice was completed (usually to await availability of a re-
		  source).

     ru_nivcsw	  the number of times a context switch resulted due to a high-
		  er priority process becoming runnable or because the current
		  process exceeded its time slice.

NOTES
     The numbers ru_inblock and ru_oublock account only for real I/O; data
     supplied by the caching mechanism is charged only to the first process to
     read or write the data.

ERRORS
     Getrusage() returns -1 on error.  The possible errors are:

     [EINVAL]	   The who parameter is not a valid value.

     [EFAULT]	   The address specified by the rusage parameter is not in a
		   valid part of the process address space.

SEE ALSO
     gettimeofday(2),  wait(2)

BUGS
     There is no way to obtain information about a child process that has not
     yet terminated.

HISTORY
     The getrusage function call appeared in 4.2BSD.

4th Berkeley Distribution	 June 4, 1993				     2
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