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Showing content from https://cplusplus.com/reference/cstdio/FOPEN_MAX/ below:

constant

<cstdio>

FOPEN_MAX

Potential limit of simultaneous open streams

This macro constant expands to an integral expression that represents the maximum number of files that can be opened simultaneously.

Particular library implementations may count files opened by tmpfile towards this limit. Implementations may also allow more files to be opened beyond this limit.

FOPEN_MAX shall be greater than 7 on all systems.



See also
TMP_MAX
Number of temporary files (constant)

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