size_t is the unsigned integer result of the
sizeof keyword.FILE is a type suitable for storing
information for a file stream.
fpos_t is a type suitable for storing any
position in a file.
NULL is the value of a null pointer
constant.
_IOFBF, _IOLBF, and
_IONBF are used in the setvbuf function.
BUFSIZ is an integer which represents the
size of the buffer used by the setbuf function.
EOF is a negative integer which indicates an
end-of-file has been reached.
FOPEN_MAX is an integer which represents the
maximum number of files that the system can guarantee that can
be opened simultaneously.
FILENAME_MAX is an integer which represents
the longest length of a char array suitable for holding the
longest possible filename. If the implementation imposes no
limit, then this value should be the recommended maximum value.
L_tmpnam is an integer which represents the
longest length of a char array suitable for holding the longest
possible temporary filename created by the tmpnam function.
SEEK_CUR, SEEK_END, and
SEEK_SET are used in the fseek function.
TMP_MAX is the maximum number of unique
filenames that the function tmpnam can generate.
stderr, stdin, and
stdout are pointers to FILE
types which correspond to the standard error, standard input,
and standard output streams.
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