[OpenAFS-devel] pr_Initialize falis when called within a simple application

[Douglas E. Engert]

If it finds the .AFSSERVER it means the machine is using the
AFS/NFS translator.


John Hayes wrote:

> One striking difference between the two programs can be seen in the
> following output from strace. Remember that some debugger code was put in
> tyhe libraries and that will show up as well -
> 
> 
> strace output from klog:
> getitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={2147483, 646000}}) = 0
> write(1, "in rx1\n", 7)                 = 7
> write(1, "got mem!\n", 9)               = 9
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
> ioctl(4, 0x8912, 0xbfffc188)            = 0
> ioctl(4, 0x8915, 0xbfffc190)            = 0
> ioctl(4, 0x8915, 0xbfffc1b0)            = 0
> ioctl(4, 0x8913, 0xbfffc1b0)            = 0
> ioctl(4, 0x8921, 0xbfffc1b0)            = 0
> ioctl(4, 0x891b, 0xbfffc1b0)            = 0
> close(4)                                = 0
> brk(0)                                  = 0x80b5000
> brk(0x80dc000)                          = 0x80dc000
> 
> 
> strace output from my test program:
> etitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={2147483, 646000}}) = 0
> open("/home/jhh/.AFSSERVER", O_RDONLY)  = -1 ENOENT (No such file or
> directory)
> open("/.AFSSERVER", O_RDONLY)           = -1 ENOENT (No such file or
> directory)
> afs_syscall(0x14, 0, 0x400c5608, 0xbfffc770, 0) = 0
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 2), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0x4001a000
> write(1, "in rx1\n", 7)                 = 7
> write(1, "got mem!\n", 9)               = 9
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
> ioctl(4, 0x8912, 0xbfffc4f8)            = 0
> ioctl(4, 0x8915, 0xbfffc500)            = 0
> ioctl(4, 0x8915, 0xbfffc520)            = 0
> ioctl(4, 0x8913, 0xbfffc520)            = 0
> ioctl(4, 0x8921, 0xbfffc520)            = 0
> ioctl(4, 0x891b, 0xbfffc520)            = 0
> close(4)                                = 0
> brk(0)                                  = 0x8086000
> brk(0x80ad000)                          = 0x80ad000
> 
> 
> Why is my test program looking for this .AFSSERVER file?
> 
> 
> 
> 
>>>Unlikely...  Byteswapping of 42166 yields 46756 (7004 swaps to 23579).
>>>So I don't think it's pure byteswapping.  It's not bit-swapped,
>>>either..  So I have no clue where this port number came from.  Perhaps
>>>an uninitialized variable?
>>
>>Well, I think one thing to ask, again, is what stracing and grepping for
>>calls to open returned different in each case; but that's probably not it
>>either.
> 
> 
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> 
> 
> 

-- 

  Douglas E. Engert  <DEEngert@anl.gov>
  Argonne National Laboratory
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  Argonne, Illinois  60439
  (630) 252-5444