NAME

getdtablesize - get descriptor table size

SYNOPSIS

#include <unistd.h> int getdtablesize(void);

DESCRIPTION

getdtablesize(2) returns the maximum number of files a process can have open.

NOTES

getdtablesize(2) is implemented as a library function in DLL 4.4.1. This function returns OPEN_MAX (set to 256 in Linux 2.0.23) if OPEN_MAX was defined when the library was compiled. Otherwise, -1 is returned, and errno is set to ENOSYS.

A process under linux may open far more file descriptors than 256 however. To get even more file descriptors you have to tweak the system wide maximums with

/proc/sys/net/file-max

CONFORMING TO

SVr4, 4.4BSD (the getdtablesize(2) function first appeared in BSD 4.2).

SEE ALSO

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