#include <sys/resource.h>
/* Return resource usage information on process indicated by WHO
and put
it in *USAGE. Returns 0 for success, -1 for failure. */
extern int getrusage
(__rusage_who_t __who, struct rusage *__usage) __THROW;
参数：
who：可能选择有
RUSAGE_SELF：获取当前进程的资源使用信息。
RUSAGE_CHILDREN：获取子进程的资源使用信息。
usage：指向存放资源使用信息的结构指针
#include <bits/resources.>
/* 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;
};