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getrusage(3p) [centos 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)

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<sys/resource.h>(P)					     POSIX Programmer's Manual					       <sys/resource.h>(P)

NAME
sys/resource.h - definitions for XSI resource operations SYNOPSIS
#include <sys/resource.h> DESCRIPTION
The <sys/resource.h> header shall define the following symbolic constants as possible values of the which argument of getpriority() and setpriority(): PRIO_PROCESS Identifies the who argument as a process ID. PRIO_PGRP Identifies the who argument as a process group ID. PRIO_USER Identifies the who argument as a user ID. The following type shall be defined through typedef: rlim_t Unsigned integer type used for limit values. The following symbolic constants shall be defined: RLIM_INFINITY A value of rlim_t indicating no limit. RLIM_SAVED_MAX A value of type rlim_t indicating an unrepresentable saved hard limit. RLIM_SAVED_CUR A value of type rlim_t indicating an unrepresentable saved soft limit. On implementations where all resource limits are representable in an object of type rlim_t, RLIM_SAVED_MAX and RLIM_SAVED_CUR need not be distinct from RLIM_INFINITY. The following symbolic constants shall be defined as possible values of the who parameter of getrusage(): RUSAGE_SELF Returns information about the current process. RUSAGE_CHILDREN Returns information about children of the current process. The <sys/resource.h> header shall define the rlimit structure that includes at least the following members: rlim_t rlim_cur The current (soft) limit. rlim_t rlim_max The hard limit. The <sys/resource.h> header shall define the rusage structure that includes at least the following members: struct timeval ru_utime User time used. struct timeval ru_stime System time used. The timeval structure shall be defined as described in <sys/time.h> . The following symbolic constants shall be defined as possible values for the resource argument of getrlimit() and setrlimit(): RLIMIT_CORE Limit on size of core file. RLIMIT_CPU Limit on CPU time per process. RLIMIT_DATA Limit on data segment size. RLIMIT_FSIZE Limit on file size. RLIMIT_NOFILE Limit on number of open files. RLIMIT_STACK Limit on stack size. RLIMIT_AS Limit on address space size. The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided. int getpriority(int, id_t); int getrlimit(int, struct rlimit *); int getrusage(int, struct rusage *); int setpriority(int, id_t, int); int setrlimit(int, const struct rlimit *); The id_t type shall be defined through typedef as described in <sys/types.h> . Inclusion of the <sys/resource.h> header may also make visible all symbols from <sys/time.h>. The following sections are informative. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
<sys/time.h> , <sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, getpriority(), getrusage(), getrlimit() 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 <sys/resource.h>(P)

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