Huge difference between _POSIX_OPEN_MAX and sysconf(_SC_OPEN

9 More Discussions You Might Find Interesting

1. Solaris

Huge PI in vmstat

This is something nowbody around me can explain: vmstat (-S 5) shows a huge number of PI but when I try to monitor it in parallel with iostat - there is no IO activity to be seen that would correspond to this. I have 16G RAM and 32G swap file. I'll really appreciate if somebody can explain it....

2. UNIX for Dummies Questions & Answers

Difference between two huge files

Hi, As per my requirement, I need to take difference between two big files(around 6.5 GB) and get the difference to a output file without any line numbers or '<' or '>' in front of each new line. As DIFF command wont work for big files, i tried to use BDIFF instead. I am getting incorrect...

3. Ubuntu

kernel-huge

Hi All, I have a uname -a Linux caws101arop 2.6.9-67.0.20.ELsmp #1 SMP Wed Jun 18 12:35:02 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux And I'm having lots of problem especially when the web server got new two additional website. Before the memory was just 12G but we upgraded it to 65G. Do...

4. AIX

Huge difference in reported Disk usage between ls,df and du

IBM RS6000 F50 AIX 4.3.2 i am having trouble in calculating the actual size of a set of directories and reconciling the results with the actual Hard Disk space used I have 33GB disk which is showing 7.8GB used, a byte count of the files in the directory/sub-dirs i`m interested in is 48GB,...

5. Shell Programming and Scripting

Three Difference File Huge Data Comparison Problem.

I got three different file: Part of File 1 ARTPHDFGAA . . Part of File 2 ARTGHHYESA . . Part of File 3 ARTPOLYWEA . .

6. Programming

what is the main difference between difference between using nonatomic lseek and O_APPEND

I think both write at the end of the file ...... but is there a sharp difference between those 2 instruction ..... thank you this is my 3rd question today forgive me :D

7. Shell Programming and Scripting

Difference between two huge .csv files

Hi all, I need help on getting difference between 2 .csv files. I have 2 large . csv files which has equal number of columns. I nned to compare them and get output in new file which will have difference olny. E.g. File1.csv Name, Date, age,number Sakshi, 16-12-2011, 22, 56 Akash,...

8. UNIX for Dummies Questions & Answers

Shc script size limitation and "_SC_ARG_MAX (see sysconf(2))" parameter

I wish to change the parameter (which I do not understand exactly what it is and I wish to) and be able to use shc with very long bash scripts

9. Shell Programming and Scripting

awk to calculate difference of split and sum the difference

In the awk I am trying to subtract the difference $3-$2 of each matching $4 before the first _ (underscore) and print that value in $13. I think the awk will do that, but added comments. What I am not sure off is how to add a line or lines that will add sum each matching $13 value and put it in...

LEARN ABOUT LINUX

getdtablesize

GETDTABLESIZE(3)					     Linux Programmer's Manual						  GETDTABLESIZE(3)

NAME

       getdtablesize - get descriptor table size

SYNOPSIS

       #include <unistd.h>

       int getdtablesize(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getdtablesize():
	   Since glibc 2.12:
	       _BSD_SOURCE ||
		   !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
	   Before glibc 2.12:
	       _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

DESCRIPTION

       getdtablesize()	returns  the maximum number of files a process can have open, one more than the largest possible value for a file descrip-
       tor.

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.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------------+---------------+---------+
       |Interface	| Attribute	| Value   |
       +----------------+---------------+---------+
       |getdtablesize() | Thread safety | MT-Safe |
       +----------------+---------------+---------+
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.

SEE ALSO

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

Linux								    2015-03-02							  GETDTABLESIZE(3)