Linux Blog

GETDTABLESIZE

Section: Linux Programmer's Manual (2)
Updated: 2002-04-15
Index Return to Main Contents
 

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.  

ERRORS

On Linux, getdtablesize() can return any of the errors described for getrlimit(2); see NOTES below.  

CONFORMING TO

SVr4, 4.4BSD (the getdtablesize() function first appeared in 4.2BSD). It is not specified in POSIX.1-2001; portable applications should employ sysconf(_SC_OPEN_MAX) instead of this call.  

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).  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO




Random Man Pages:
mirrorblob
ascii
drift
..