Description:
Q&A for people programming under Unix.
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a tricky expression
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Hi Trying to understand some application dealing with VLAN and can't figure out what this piece of code does: ...unsigned long vlan_member_array[VLAN_BITMAP_ ARRAY_SIZE]; int sw_is_set_vlan_bit(unsigned long *VlanBitArray, int vlan_id) { return (VlanBitArray[(vlan_id - 1) / 32] & (1 << ((vlan_id - 1) % 32)));... more »
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Restricting symbols from getting exported to global symb table
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Hi All, We have an executable on Linux which is linked to some third party library. When our executable gets loaded , we got symbol conflicts for the third party shared library. To resolve the symbol conflict we tried to build our executable with '--version-script' to restrict the symbols to local scope , however we... more »
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Check file size limit of a file system?
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Is it possible to check the file size limit of a file system that is being used in a partition? If it's possible then how is it done? Thanks in advance, Rui Maciel
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symlink insecurity race
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Suppose you need to create and/or overwrite your own file in a sticky world writable diretory. If malicious user already created a symlink with the same name, they can trick you into overwriting a different file of your own. I worked around the problem on Linux by using O_NOFOLLOW: ...To see the full working code, it's at:... more »
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