rusage code example

Example: rusage

Resource Usage: The function getrusage() and the data type struct rusage are used to examine the resource usage of a process.
 
NAME:
	getrusage - get information about resource utilization.
SYNOPSIS:
	#include <sys/resource.h>
    int getrusage(int who, struct rusage *r_usage);
DESCRIPTION:
	The getrusage() function shall provide measures of the resources used by the current process or its terminated and waited-for child processes.
    
    int who argument:
    	If the value of the who argument is RUSAGE_SELF, information shall be returned about resources used by the current process.
        If the value of the who argument is RUSAGE_CHILDREN, information shall be returned about resources used by the terminated and waited-for children of the current process.
        
        If the child is never waited for (for example, 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().
   	struct rusage *r_usage argument:
   		The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored.
RETURN VALUE:
	Upon successful completion, getrusage() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.
ERRORS:
	The getrusage() function shall fail if:
	[EINVAL]
	The value of the who argument is not valid.