SEI CERT C Coding Standard

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File Types and Effects

Type

Note on effectEffect

Another regular file

The fstat() verification fails.

FIFO

Either open() returns -1 and sets errno to ENXIO, or open() succeeds and the fstat() verification fails.

Symbolic link

open() returns -1 if O_NOFOLLOW is available; otherwise, the fstat() verification fails.

Special device

Usually the fstat() verification fails on st_mode. This can still be a problem if the device is one for which just opening (or closing) it causes something to happen. If st_mode compares equal, then the device is one that, after opening, appears to be a regular file. It would then fail the fstat() verification on st_dev and st_ino (unless it happens to be the same file, as can happen with /dev/fd/* on Solaris, but this would not be a problem).

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