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Use getrusage()
Not all informations are set.
/* Structure which says how much of each resource has been used. */
struct rusage
{
/* Total amount of user time used. */
struct timeval ru_utime;
/* Total amount of system time used. */
struct timeval ru_stime;
/* Maximum resident set size (in kilobytes). */
long int ru_maxrss;
/* Amount of sharing of text segment memory
with other processes (kilobyte-seconds). */
long int ru_ixrss;
/* Amount of data segment memory used (kilobyte-seconds). */
long int ru_idrss;
/* Amount of stack memory used (kilobyte-seconds). */
long int ru_isrss;
/* Number of soft page faults (i.e. those serviced by reclaiming
a page from the list of pages awaiting reallocation. */
long int ru_minflt;
/* Number of hard page faults (i.e. those that required I/O). */
long int ru_majflt;
/* Number of times a process was swapped out of physical memory. */
long int ru_nswap;
/* Number of input operations via the file system. Note: This
and `ru_oublock' do not include operations with the cache. */
long int ru_inblock;
/* Number of output operations via the file system. */
long int ru_oublock;
/* Number of IPC messages sent. */
long int ru_msgsnd;
/* Number of IPC messages received. */
long int ru_msgrcv;
/* Number of signals delivered. */
long int ru_nsignals;
/* Number of voluntary context switches, i.e. because the process
gave up the process before it had to (usually to wait for some
resource to be available). */
long int ru_nvcsw;
/* Number of involuntary context switches, i.e. a higher priority process
became runnable or the current process used up its time slice. */
long int ru_nivcsw;
};
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