getrusage - get information about resource utilisation
#include <sys/resource.h> int getrusage(int who, struct rusage *r_usage);
The getrusage() function provides measures of the resources used by the current process or its terminated and waited-for child processes. If the value of the who argument is RUSAGE_SELF, information is returned about resources used by the current process. If the value of the who argument is RUSAGE_CHILDREN, information is returned about resources used by the terminated and waited-for children of the current process. If the child is never waited for (for instance, if the parent has SA_NOCLDWAIT set or sets SIGCHLD to SIG_IGN), the resource information for the child process is discarded and not included in the resource information provided by getrusage().
The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored.
Upon successful completion, getrusage() returns 0. Otherwise, -1 is returned, and errno is set to indicate the error.
The getrusage() function will fail if:
- The value of the who argument is not valid.
exit(), sigaction(), time(), times(), wait(), <sys/resource.h>.