GETDTABLESIZE(3) BSD Library Functions Manual GETDTABLESIZE(3)NAME
getdtablesize -- get descriptor table size
Standard C Library (libc, -lc)
The getdtablesize function is an equivalent of sysconf() with _SC_OPEN_MAX.
SEE ALSO close(2), dup(2), getrlimit(2), open(2), select(2), sysconf(3)HISTORY
The getdtablesize() function call appeared in 4.2BSD.
Historically, each process had a fixed size descriptor table, which is guaranteed to have at least 20 slots. The entries in the descriptor
table are numbered with small integers starting at 0. The call getdtablesize() used to return the size of this table. It doesn't make much
sense these days because the size of the table is dynamic.
BSD January 5, 2012 BSD
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getdtablesize(3C) Standard C Library Functions getdtablesize(3C)NAME
getdtablesize - get the file descriptor table size
The getdtablesize() function is equivalent to getrlimit(2) with the RLIMIT_NOFILE option.
The getdtablesize() function returns the current soft limit as if obtained from a call to getrlimit() with the RLIMIT_NOFILE option.
No errors are defined.
There is no direct relationship between the value returned by getdtablesize() and OPEN_MAX defined in <limits.h>.
Each process has a file descriptor table which is guaranteed to have at least 20 slots. The entries in the descriptor table are numbered
with small integers starting at 0. The getdtablesize() function returns the current maximum size of this table by calling the getrlimit()
SEE ALSO close(2), getrlimit(2), open(2), setrlimit(2), select(3C)SunOS 5.11 1 Mar 1996 getdtablesize(3C)
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