1GETRUSAGE(2) 386BSD Programmer's Manual GETRUSAGE(2) 2 3NNAAMMEE 4 ggeettrruussaaggee - get information about resource utilization 5 6SSYYNNOOPPSSIISS 7 ##iinncclluuddee <<ssyyss//ttiimmee..hh>> 8 ##iinncclluuddee <<ssyyss//rreessoouurrccee..hh>> 9 ##ddeeffiinnee RRUUSSAAGGEE__SSEELLFF 00 10 ##ddeeffiinnee RRUUSSAAGGEE__CCHHIILLDDRREENN --11 11 12 _i_n_t 13 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) 14 15DDEESSCCRRIIPPTTIIOONN 16 GGeettrruussaaggee() returns information describing the resources utilized by the 17 current process, or all its terminated child processes. The _w_h_o 18 parameter is either RUSAGE_SELF or RUSAGE_CHILDREN. The buffer to which 19 _r_u_s_a_g_e points will be filled in with the following structure: 20 21 struct rusage { 22 struct timeval ru_utime; /* user time used */ 23 struct timeval ru_stime; /* system time used */ 24 long ru_maxrss; /* integral max resident set size */ 25 long ru_ixrss; /* integral shared text memory size */ 26 long ru_idrss; /* integral unshared data size */ 27 long ru_isrss; /* integral unshared stack size */ 28 long ru_minflt; /* page reclaims */ 29 long ru_majflt; /* page faults */ 30 long ru_nswap; /* swaps */ 31 long ru_inblock; /* block input operations */ 32 long ru_oublock; /* block output operations */ 33 long ru_msgsnd; /* messages sent */ 34 long ru_msgrcv; /* messages received */ 35 long ru_nsignals; /* signals received */ 36 long ru_nvcsw; /* voluntary context switches */ 37 long ru_nivcsw; /* involuntary context switches */ 38 }; 39 40 The fields are interpreted as follows: 41 42 _r_u__u_t_i_m_e the total amount of time spent executing in user mode. 43 44 _r_u__s_t_i_m_e the total amount of time spent in the system executing on 45 behalf of the process(es). 46 47 _r_u__m_a_x_r_s_s the maximum resident set size utilized (in kilobytes). 48 49 _r_u__i_x_r_s_s an integral value indicating the amount of memory used by 50 the text segment that was also shared among other processes. 51 This value is expressed in units of kilobytes * ticks-of- 52 execution. 53 54 _r_u__i_d_r_s_s an integral value of the amount of unshared memory residing 55 in the data segment of a process (expressed in units of 56 kilobytes * ticks-of-execution). 57 58 _r_u__i_s_r_s_s an integral value of the amount of unshared memory residing 59 in the stack segment of a process (expressed in units of 60 kilobytes * ticks-of-execution). 61 62 _r_u__m_i_n_f_l_t the number of page faults serviced without any I/O activity; 63 here I/O activity is avoided by reclaiming a page frame from 64 65 66 the list of pages awaiting reallocation. 67 68 _r_u__m_a_j_f_l_t the number of page faults serviced that required I/O 69 activity. 70 71 _r_u__n_s_w_a_p the number of times a process was swapped out of main 72 memory. 73 74 _r_u__i_n_b_l_o_c_k the number of times the file system had to perform input. 75 76 _r_u__o_u_b_l_o_c_k the number of times the file system had to perform output. 77 78 _r_u__m_s_g_s_n_d the number of IPC messages sent. 79 80 _r_u__m_s_g_r_c_v the number of IPC messages received. 81 82 _r_u__n_s_i_g_n_a_l_s the number of signals delivered. 83 84 _r_u__n_v_c_s_w the number of times a context switch resulted due to a 85 process voluntarily giving up the processor before its time 86 slice was completed (usually to await availability of a 87 resource). 88 89 _r_u__n_i_v_c_s_w the number of times a context switch resulted due to a 90 higher priority process becoming runnable or because the 91 current process exceeded its time slice. 92 93NNOOTTEESS 94 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 95 supplied by the caching mechanism is charged only to the first process to 96 read or write the data. 97 98EERRRROORRSS 99 GGeettrruussaaggee() returns -1 on error. The possible errors are: 100 101 [EINVAL] The _w_h_o parameter is not a valid value. 102 103 [EFAULT] The address specified by the _r_u_s_a_g_e parameter is not in a 104 valid part of the process address space. 105 106SSEEEE AALLSSOO 107 gettimeofday(2), wait(2) 108 109BBUUGGSS 110 There is no way to obtain information about a child process that has not 111 yet terminated. 112 113HHIISSTTOORRYY 114 The ggeettrruussaaggee function call appeared in 4.2BSD. 115 1164th Berkeley Distribution March 10, 1991 2 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133