getdtablesize() returns the maximum number of files a process can have open, one more than the largest possible value for a file descriptor.

The current limit on the number of open files per process.

getdtablesize() is implemented as a libc library function. The glibc version calls getrlimit(2)and returns the current RLIMIT_NOFILE limit, or OPEN_MAX when that fails. The libc4 and libc5 versions return OPEN_MAX (set to 256 since Linux 0.98.4).

SVr4, 4.4BSD (the getdtablesize() function first appeared in 4.2BSD).

close(2),dup(2),getrlimit(2),open(2)