Date: Wed, 19 Apr 2006 14:46:53 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Mathieu Prevot <bsdhack@club-internet.fr> Cc: freebsd-hackers@freebsd.org Subject: Re: sysctl(3) and sysctl(8) discrepancies Message-ID: <20060419194653.GB18095@dan.emsphone.com> In-Reply-To: <20060419160436.GA6835@scienceclue.ath.cx> References: <20060419160436.GA6835@scienceclue.ath.cx>
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In the last episode (Apr 19), Mathieu Prevot said: > Hello, > > I have FreeBSD 6.1-RC #27: Wed Apr 19 02:08:00 CEST 2006 amd64 and I have 3 > different outputs about hw.ncpu: > > `sysctl hw.ncpu` gives me: > > 'hw.ncpu: 2' > > > and I have: > > hw.ncpu = 6 > hw.ncpu = 3 > > > with: > > #include <stdlib.h> > #include <sys/types.h> > #include <sys/sysctl.h> > > main() > { > int ncpu[1]; > size_t len; > > len=sizeof(int); > sysctlnametomib("hw.ncpu",ncpu,&len); You want sysctlbyname() here instead. sysctlnametomib() returns a pointer to a mib array that you can pass to the sysctl() function later. Saves having to parse the string every time if you are looking up the same sysctl repeatedly. sysctlbyname("hw.ncpu", &ncpu, &len, NULL, 0); HW_NCPU is the mib number for hw.ncpu if you want to build the mib array manually. -- Dan Nelson dnelson@allantgroup.com
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