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Trigger execution of commands whenever number of file descriptors changes
Post 302363076 by poweruser on Monday 19th of October 2009 10:32:49 AM
10-19-2009
Thanks Jim for your suggestion. I will have a look at inotify() function and try to implement desired logic.
What I was trying to do was:
I have a program on Solaris 9 OS platform, which opens a particular file for order processing (simulation). Rate at which orders are placed is random. Higher the rate, more instances of file are opened.
Currently, FD softlimit is 256(and they say this limit cant be increased more than this value for Solaris 9).
Whenever open FDs increase more than 256, orders fail. So I want to monitor total number of file descriptors. I hope inotify() will serve the purpose (if there is Solaris equivalent for this).
What I was trying to do was:
I have a program on Solaris 9 OS platform, which opens a particular file for order processing (simulation). Rate at which orders are placed is random. Higher the rate, more instances of file are opened.
Currently, FD softlimit is 256(and they say this limit cant be increased more than this value for Solaris 9).
Whenever open FDs increase more than 256, orders fail. So I want to monitor total number of file descriptors. I hope inotify() will serve the purpose (if there is Solaris equivalent for this).
Last edited by poweruser; 10-19-2009 at 11:38 AM..
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LEARN ABOUT PHP
inotify_init1
INOTIFY_INIT(2) Linux Programmer's Manual INOTIFY_INIT(2) NAME
inotify_init, inotify_init1 - initialize an inotify instance SYNOPSIS
#include <sys/inotify.h> int inotify_init(void); int inotify_init1(int flags); DESCRIPTION
For an overview of the inotify API, see inotify(7). inotify_init() initializes a new inotify instance and returns a file descriptor associated with a new inotify event queue. If flags is 0, then inotify_init1() is the same as inotify_init(). The following values can be bitwise ORed in flags to obtain different behavior: IN_NONBLOCK Set the O_NONBLOCK file status flag on the new open file description. Using this flag saves extra calls to fcntl(2) to achieve the same result. IN_CLOEXEC Set the close-on-exec (FD_CLOEXEC) flag on the new file descriptor. See the description of the O_CLOEXEC flag in open(2) for reasons why this may be useful. RETURN VALUE
On success, these system calls return a new file descriptor. On error, -1 is returned, and errno is set to indicate the error. ERRORS
EINVAL (inotify_init1()) An invalid value was specified in flags. EMFILE The user limit on the total number of inotify instances has been reached. EMFILE The per-process limit on the number of open file descriptors has been reached. ENFILE The system-wide limit on the total number of open files has been reached. ENOMEM Insufficient kernel memory is available. VERSIONS
inotify_init() first appeared in Linux 2.6.13; library support was added to glibc in version 2.4. inotify_init1() was added in Linux 2.6.27; library support was added to glibc in version 2.9. CONFORMING TO
These system calls are Linux-specific. SEE ALSO
inotify_add_watch(2), inotify_rm_watch(2), inotify(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-09-15 INOTIFY_INIT(2)