getdtablesize(2) - Linux man page

Name

getdtablesize - get descriptor table size

Synopsis

#include <unistd.h>

int getdtablesize(void);

Description

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

Return Value

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

Notes

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).

Conforming to

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