LSEEK and large files in Scyld

Peter Lindgren Peter.Lindgren at experian.com
Thu Oct 18 13:37:30 EDT 2001


The code:
    off_t	off_t_ret;
    off_t	byte_offset;
    ......
    off_t_ret = lseek(input_file, byte_offset, 0);
    printf("lseek returned (off_t as lld)= %lld on seek to %lld\n", off_t_ret, byte_offset);
    if ( off_t_ret < 0 ) {
        break;
        }
(I have _FILE_OFFSET_BITS=64 defined)

On the system with:
Scyld Beowulf release 27bz-7
Kernel 2.2.17-33.beo

-rw-rw-r--    1 root     root     2879944568 Sep 10 09:22 ../test/test4.ipt
sizeof(off_t_ret)  =8 
sizeof(byte_offset)=8 
lseek returned (off_t as lld)= 71478149 on seek to 71478149
lseek returned (off_t as lld)= 2143376790 on seek to 2143376790
lseek returned (off_t as lld)= 2147241391 on seek to 2147241391
lseek returned (off_t as lld)= -2146458477 on seek to 2148508819
lseek returned (off_t as lld)= -1415228299 on seek to 2879738997


On the system with:
Scyld Beowulf Basic Edition 27bz-8
Kernel 2.2.19-12.beo

-rw-rw-r--    1 peterl   peterl   2879944568 Oct 17 11:13 ../test/test4.ipt
sizeof(off_t_ret)  =8 
sizeof(byte_offset)=8 
lseek returned (off_t as lld)= 71478149 on seek to 71478149
lseek returned (off_t as lld)= 2143376790 on seek to 2143376790
lseek returned (off_t as lld)= 2147241391 on seek to 2147241391
lseek returned (off_t as lld)= -1 on seek to 2148508819
lseek returned (off_t as lld)= -1 on seek to 2879738997


Doesn't seem to work in either case; just reports failure differently. 



Peter Lindgren
Phone: 847 944 4515
Fax: 847 517 5889
E-mail: peter.lindgren at experian.com


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