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 5.10 1 Mar 1996 getdtablesize(3C)
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getdtablesize(2) System Calls Manual getdtablesize(2)NAME
getdtablesize() - get the size of the per-process file descriptor table
The function returns the maximum number of file descriptors that can currently be stored in a process' file descriptor table. This maximum
number is also known as the soft limit for open files, and can be adjusted up to the hard limit by calling The entries in the descriptor
table are numbered with small integers starting at 0 (zero).
The function returns the total number of file descriptors that a process can have open simultaneously. Each process is limited to a cur-
rent maximum (soft limit) and a fixed upper bound (hard limit) of open file descriptors. This limit is at least 32. The system-defined
limits are configurable. See the descriptions of the and kernel parameters in maxfiles_lim(5) and maxfiles(5), respectively, for informa-
tion about changing the system-defined, per-process limit on open file descriptors.
The function returns the size of the descriptor table (soft limit), and is always successful.
SEE ALSO close(2), getrlimit(2), open(2), select(2), setrlimit(2), sysconf(2), maxfiles(5), maxfiles_lim(5).
STANDARDS CONFORMANCE getdtablesize(2)
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