The use of Getrusage in Linux

Declaration:int getrusage (int who, struct rusage *usage);  

The Getrusage function returns the current resource usage. Returns the resource usage for the current process when the WHO parameter is rusage_self, and returns the resource used by the child process with a status of terminating or waiting when it is rusage_children.

The returned result exists in struct struct rusage:

struct Rusage {    struct timeval ru_utime;/* User Time used the duration of use */    struct timeval ru_stime;/* System " D The time of the kernel usage */    long   ru_maxrss;        /* Maximum resident set size  */    long   ru_ixrss;         /* Integral shared 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 */};

Use of Getrusage in Linux