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Test Your Knowledge in Computers #104
Difficulty: Easy
Unix is a family of multitasking, portable, multi-user computer operating systems, which do not have time-sharing capability.
True or False?
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getrusage(3p) [suse man page]

GETRUSAGE(3P)						     POSIX Programmer's Manual						     GETRUSAGE(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. 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 pro- cesses. 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(). 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. The following sections are informative. EXAMPLES
Using getrusage() The following example returns information about the resources used by the current process. #include <sys/resource.h> ... int who = RUSAGE_SELF; struct rusage usage; int ret; ret = getrusage(who, &usage); APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
exit(), sigaction(), time(), times(), wait(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/resource.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 GETRUSAGE(3P)

Check Out this Related Man Page

GETEUID(3P)                                                  POSIX Programmer's Manual                                                 GETEUID(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
geteuid - get the effective user ID SYNOPSIS
#include <unistd.h> uid_t geteuid(void); DESCRIPTION
The geteuid() function shall return the effective user ID of the calling process. RETURN VALUE
The geteuid() function shall always be successful and no return value is reserved to indicate an error. ERRORS
No errors are defined. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
getegid(), getgid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 GETEUID(3P)

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