GETDTABLESIZE Section: Linux Programmer's Manual (2) Updated: 22 July 2025 Index   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.   NOTES getdtablesize 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.   CONFORMING TO SVr4, 4.4BSD (the getdtablesize function first appeared in BSD 4.2).   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION NOTES CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:56:05 GMT, March 24, 2025