On linux, we just use ELF notes and this problem goes away. If there
is something equivalent in freeBSD then I could use that as well.
I wouldn't know, I'm just the poor DSA who gets to fight these machines. :)
Maybe the debian-bsd list would know.
The ELF notes are the property of ELF format which is used on both
platforms. In general, the ELF notes are available on GNU/kFreeBSD.
The kernel supplies them. Each note is a pair of name and value.
The GNU/kFreeBSD kernel does not supply note with name AT_CLKTCK.
On GNU/kFreeBSD:
$ LD_SHOW_AUXV=1 /bin/true
AT_PHDR: 0x400040
AT_PHENT: 56
AT_PHNUM: 8
AT_PAGESZ: 4096
AT_FLAGS: 0x0
AT_ENTRY: 0x400d90
AT_BASE: 0x800604000
AT_PLATFORM: /bin/true
And on Linux:
$ LD_SHOW_AUXV=1 /bin/true
AT_SYSINFO_EHDR: 0x7ffff636f000
AT_HWCAP: bfebfbff
AT_PAGESZ: 4096
AT_CLKTCK: 100
AT_PHDR: 0x400040
AT_PHENT: 56
AT_PHNUM: 8
AT_BASE: 0x7ff5b45f6000
AT_FLAGS: 0x0
AT_ENTRY: 0x400d50
AT_UID: 1000
AT_EUID: 1000
AT_GID: 1000
AT_EGID: 1000
AT_SECURE: 0
AT_PLATFORM: x86_64
In general it might correspond to one of the following
values
$ sysctl kern.clockrate
kern.clockrate: { hz = 1000, tick = 1000, profhz = 2000, stathz = 133 }
In case of /proc file system under GNU/kFreeBSD it seems as constant 100.
See definition of T2J in
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/compat/linprocfs/linprocfs.c
[Is this in any way related to ps showing completely broken timestamps
in the START column?
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=344546
It boils down to that the freebsd procfs is incomplete.
Hmm. Thanks.
Yes, the linprocfs.c file have to be extended and verified against
contemporary linux's /proc values.
Petr
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