GETRUSAGE(3P)

💖 GETRUSAGE(3P) — bestie edition 💖

okay so this is a page from the POSIX Programmer's Manual, and I need you to hear me out before you start copy-pasting anything, because there's a whole vibe disclaimer up top 👇

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🌸 PROLOG 🌸

This manual page is part of the POSIX Programmer's Manual. Heads up though — the Linux implementation of this interface may differ (so like, go consult the corresponding Linux manual page for the deets on Linux behavior), or honestly the interface may not even be implemented on Linux at all. 🙈 Check first, bestie.

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✨ NAME ✨

getrusage — get information about resource utilization. it's giving "receipts for your CPU time" 💅

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🎀 SYNOPSIS 🎀

#include <sys/resource.h>

int getrusage(int who, struct rusage *r_usage);

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🦋 DESCRIPTION 🦋

So the getrusage() function shall provide measures of the resources used by the current process or its terminated and waited-for child processes. like, it's literally the function that tells you how much your process has been eating 🍓

If the value of the who argument is RUSAGE_SELF, information shall be returned about resources used by the current process. main character energy only, no one else invited 💅

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. it's giving "my kids, but only the ones I actually checked on" 😭

⚠️ important caveat, no cap: 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(). gone. vanished. not in the group chat anymore 💀

The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored. so you gotta hand it somewhere to put the tea ☕

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⭐ RETURN VALUE ⭐

Upon successful completion, getrusage() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error. slay when it works, errno when it doesn't ✨

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🔥 ERRORS 🔥

The getrusage() function shall fail if:

• EINVAL — The value of the who argument is not valid. bestie you passed a vibe that doesn't exist 😭

The following sections are informative.

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🧚 EXAMPLES 🧚

Using getrusage()

The following example returns information about the resources used by the current process. look at her go 👑

#include <sys/resource.h>
...
int who = RUSAGE_SELF;
struct rusage usage;
int ret;

ret = getrusage(who, &usage);

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💜 APPLICATION USAGE 💜

None. literally nothing. the section is empty and honestly that's iconic of it 🌈

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🌸 RATIONALE 🌸

None. also empty. we love a minimalist 💅

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🎀 FUTURE DIRECTIONS 🎀

None. no plans, no drama, just vibes 🦋

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👑 SEE ALSO 👑

• exit()
• sigaction()
• time()
• times()
• wait()

The Base Definitions volume of POSIX.1‐2017, <sys_resource.h>

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💖 COPYRIGHT 💖

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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and that's the whole page, bestie 🫶 courtesy of IEEE/The Open Group, 2017 — go forth and measure your resources, you got this 💅✨