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05-09-2008
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Negative Offset
Function: int fcntl(int fd, int cmd, struct flock * lock)
Data Type: struct flock This structure is used with the fcntl function to describe a file lock. It has these members: off_t l_start This specifies the offset of the start of the region to which the lock applies, and is given in bytes relative to the point specified by l_whence member. off_t l_len This specifies the length of the region to be locked. A value of 0 is treated specially; it means the region extends to the end of the file. Can I set negative offset to l_start? 
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05-09-2008
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off_t is a typedef for long (C99 standard) so, yes it can be negative if the l_whence is SEEK_CUR or SEEK_END
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