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28 .\" @(#)getrusage.2 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/sys/getrusage.2,v 1.10.2.5 2001/12/14 18:34:00 ru Exp $
30 .\" $DragonFly: src/lib/libc/sys/getrusage.2,v 1.3 2006/02/17 19:35:06 swildner Exp $
37 .Nd get information about resource utilization
44 .Fd "#define RUSAGE_SELF 0"
45 .Fd "#define RUSAGE_CHILDREN -1"
47 .Fn getrusage "int who" "struct rusage *rusage"
50 returns information describing the resources utilized by the current
51 process, or all its terminated child processes.
60 points will be filled in with
61 the following structure:
64 struct timeval ru_utime; /* user time used */
65 struct timeval ru_stime; /* system time used */
66 long ru_maxrss; /* max resident set size */
67 long ru_ixrss; /* integral shared text memory size */
68 long ru_idrss; /* integral unshared data size */
69 long ru_isrss; /* integral unshared stack size */
70 long ru_minflt; /* page reclaims */
71 long ru_majflt; /* page faults */
72 long ru_nswap; /* swaps */
73 long ru_inblock; /* block input operations */
74 long ru_oublock; /* block output operations */
75 long ru_msgsnd; /* messages sent */
76 long ru_msgrcv; /* messages received */
77 long ru_nsignals; /* signals received */
78 long ru_nvcsw; /* voluntary context switches */
79 long ru_nivcsw; /* involuntary context switches */
83 The fields are interpreted as follows:
84 .Bl -tag -width ru_minfltaa
86 the total amount of time spent executing in user mode.
88 the total amount of time spent in the system executing on behalf
91 the maximum resident set size utilized (in kilobytes).
95 value indicating the amount of memory used
97 that was also shared among other processes. This value is expressed
98 in units of kilobytes * ticks-of-execution.
99 Ticks are statistics clock ticks.
100 The statistics clock has a frequency of
101 .Fn sysconf _SC_CLOCK_TCK
104 an integral value of the amount of unshared memory residing in the
105 data segment of a process (expressed in units of
106 kilobytes * ticks-of-execution).
108 an integral value of the amount of unshared memory residing in the
109 stack segment of a process (expressed in units of
110 kilobytes * ticks-of-execution).
112 the number of page faults serviced without any I/O activity; here
113 I/O activity is avoided by
116 the list of pages awaiting reallocation.
118 the number of page faults serviced that required I/O activity.
120 the number of times a process was
125 the number of times the file system had to perform input.
127 the number of times the file system had to perform output.
129 the number of IPC messages sent.
131 the number of IPC messages received.
133 the number of signals delivered.
135 the number of times a context switch resulted due to a process
136 voluntarily giving up the processor before its time slice was
137 completed (usually to await availability of a resource).
139 the number of times a context switch resulted due to a higher
140 priority process becoming runnable or because the current process
141 exceeded its time slice.
148 account only for real
149 I/O; data supplied by the caching mechanism is charged only
150 to the first process to read or write the data.
156 function will fail if:
161 parameter is not a valid value.
163 The address specified by the
165 parameter is not in a valid part of the process address space.
174 function call appeared in
177 There is no way to obtain information about a child process
178 that has not yet terminated.