1 files changed, 17 insertions, 6 deletions
diff --git a/lib/libc/sys/getrusage.2 b/lib/libc/sys/getrusage.2
index 9d1657c..0f92569 100644
--- a/lib/libc/sys/getrusage.2
+++ b/lib/libc/sys/getrusage.2
@@ -38,6 +38,7 @@
 .Nm getrusage
 .Nd get information about resource utilization
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
 .Fd #include <sys/time.h>
 .Fd #include <sys/resource.h>
 .Fd #define	RUSAGE_SELF	 0
@@ -62,7 +63,7 @@ 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_maxrss;          /* 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 */
@@ -93,6 +94,9 @@ an \*(lqintegral\*(rq 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-execution.
+Ticks are statistics clock ticks.
+The statistics clock has a frequency of
+sysconf(_SC_CLOCK_TCK) ticks per second.
 .It Fa ru_idrss
 an integral value of the amount of unshared memory residing in the
 data segment of a process (expressed in units of
@@ -137,10 +141,16 @@ and
 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.
+.Sh RETURN VALUES
+Uponsuccessful completion,
+.Fn getrusage
+returns 0.  Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
 .Sh ERRORS
-.Fn Getrusage
-returns -1 on error.
-The possible errors are:
+The
+.Fn getrusage
+function will fail if:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
@@ -153,12 +163,13 @@ parameter is not in a valid part of the process address space.
 .El
 .Sh SEE ALSO
 .Xr gettimeofday 2 ,
-.Xr wait 2
+.Xr wait 2 ,
+.Xr clocks 7
 .Sh BUGS
 There is no way to obtain information about a child process
 that has not yet terminated.
 .Sh HISTORY
 The
-.Nm
+.Fn getrusage
 function call appeared in
 .Bx 4.2 .