Harald Eilertsen
45e6aebfbf
Just a quick app to test and demonstrate how to get run times from a specific thread on FreeBSD.
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
/*
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* SPDX-FileCopyrightText: 2025 Eilertsens Kodeknekkeri
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* SPDX-FileCopyrightText: 2025 The FreeBSD Foundation
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* SPDX-FileContributor: Harald Eilertsen <haraldei@anduin.net>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "helpers.hpp"
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#include <cassert>
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#include <iostream>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <unistd.h>
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void sysctl_cpu_time(pthread_t thread, struct timeval * utime, struct timeval * stime) {
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int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID|KERN_PROC_INC_THREAD, getpid() };
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auto miblen = sizeof mib / sizeof mib[0];
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size_t bufsize = 0;
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auto rc = sysctl(mib, miblen, nullptr, &bufsize, nullptr, 0);
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// for some reason it seems sysctl sometimes return 0 (Ok) instead of ENOMEM when
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// passed a nullptr as oldp. This is not according to documentation.
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assert(rc == ENOMEM || rc == 0);
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auto procinfo_buf = malloc(bufsize);
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rc = sysctl(mib, 4U, procinfo_buf, &bufsize, nullptr, 0);
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assert(rc == 0);
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auto count = bufsize / sizeof(struct kinfo_proc);
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#ifndef NDEBUG
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std::cout << "[*] Received procinfo @ " << procinfo_buf
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<< ", with " << count << " entries" << std::endl;
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#endif
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for (auto i = 0U; i < count; ++i) {
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auto tinfo = (struct kinfo_proc *)procinfo_buf + i;
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#ifndef NDEBUG
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std::cout << "[*] " << i
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<< ": tid = " << tinfo->ki_tid
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<< ", runtime = " << tinfo->ki_runtime
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<< ", user time = " << timeval_to_long(tinfo->ki_rusage.ru_utime)
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<< ", sys time = " << timeval_to_long(tinfo->ki_rusage.ru_stime)
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<< std::endl;
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#endif
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if (tinfo->ki_tid == ktid) {
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*utime = tinfo->ki_rusage.ru_utime;
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*stime = tinfo->ki_rusage.ru_stime;
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break;
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}
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}
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free(procinfo_buf);
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}
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