Correct usage of stat.st_mode result for testing S_IFREG and S_IFDIR #421
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stat.st_mode cannot be tested for whether a node is S_IFDIR with
if (stat.st_mode & S_IFDIR) ...
since S_IFDIR bit (0040000) is a subset of S_IFSOCK (0140000) bits.
A correct check is
if ((stat.st_mode & S_IFMT) == S_IFDIR) ...
or alternatively, since the convenience macros are defined on all modern systems
if (S_ISDIR(stat.st_mode)) ...
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stat.st_mode cannot be tested for whether a node is S_IFDIR with
if (stat.st_mode & S_IFDIR) ...
since S_IFDIR bit (0040000) is a subset of S_IFSOCK (0140000) bits.
A correct check is
if ((stat.st_mode & S_IFMT) == S_IFDIR) ...
or alternatively, since the convenience macros are defined on all modern systems
if (S_ISDIR(stat.st_mode)) ...