4.4BSD/usr/share/man/cat2/getrusage.0
GETRUSAGE(2) BSD Programmer's Manual GETRUSAGE(2)
NNAAMMEE
ggeettrruussaaggee - get information about resource utilization
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ttiimmee..hh>>
##iinncclluuddee <<ssyyss//rreessoouurrccee..hh>>
##ddeeffiinnee RRUUSSAAGGEE__SSEELLFF 00
##ddeeffiinnee RRUUSSAAGGEE__CCHHIILLDDRREENN --11
_i_n_t
ggeettrruussaaggee(_i_n_t _w_h_o, _s_t_r_u_c_t _r_u_s_a_g_e _*_r_u_s_a_g_e);
DDEESSCCRRIIPPTTIIOONN
GGeettrruussaaggee() returns information describing the resources utilized by the
current process, or all its terminated child processes. The _w_h_o parame-
ter is either RUSAGE_SELF or RUSAGE_CHILDREN. The buffer to which _r_u_s_a_g_e
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:
_r_u___u_t_i_m_e the total amount of time spent executing in user mode.
_r_u___s_t_i_m_e the total amount of time spent in the system executing on
behalf of the process(es).
_r_u___m_a_x_r_s_s the maximum resident set size utilized (in kilobytes).
_r_u___i_x_r_s_s 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-
execution.
_r_u___i_d_r_s_s 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).
_r_u___i_s_r_s_s 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).
_r_u___m_i_n_f_l_t 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.
_r_u___m_a_j_f_l_t the number of page faults serviced that required I/O activi-
ty.
_r_u___n_s_w_a_p the number of times a process was swapped out of main memo-
ry.
_r_u___i_n_b_l_o_c_k the number of times the file system had to perform input.
_r_u___o_u_b_l_o_c_k the number of times the file system had to perform output.
_r_u___m_s_g_s_n_d the number of IPC messages sent.
_r_u___m_s_g_r_c_v the number of IPC messages received.
_r_u___n_s_i_g_n_a_l_s the number of signals delivered.
_r_u___n_v_c_s_w 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).
_r_u___n_i_v_c_s_w 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.
NNOOTTEESS
The numbers _r_u___i_n_b_l_o_c_k and _r_u___o_u_b_l_o_c_k 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.
EERRRROORRSS
GGeettrruussaaggee() returns -1 on error. The possible errors are:
[EINVAL] The _w_h_o parameter is not a valid value.
[EFAULT] The address specified by the _r_u_s_a_g_e parameter is not in a
valid part of the process address space.
SSEEEE AALLSSOO
gettimeofday(2), wait(2)
BBUUGGSS
There is no way to obtain information about a child process that has not
yet terminated.
HHIISSTTOORRYY
The ggeettrruussaaggee function call appeared in 4.2BSD.
4th Berkeley Distribution June 4, 1993 2