I would recommended a copy of one of the C Standards and POSIX.
Most of the important stuff if not all the libraries shipped out of box should have a manual page describing their usage, ones I've looked at provides function call level manual pages.
The system manuals are really helpful for system calls, (n)curses, working with network sockets , kernel interfaces, and even looking up standard library routines should you forget one (including posix related ones).
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My Journal
Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.
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