Firstly I do need to state that I am turning here as a last resort. Im in my first year of a Computer Networking and technical support course, and as a first year I must complete a Introductory Unix/Linux class. I have been doing well in the course so far however I have been stumped on the final assignment (due this friday). It is confusing - as a beginner. Im hoping someone here can possibly help me out, I need to understand this for the exam next week. Any help you guys can offer is appreciated, I will post my stuff thus far in a second. Thanks in advance, setaylor5
i'm a grad student taking a UNIX course and a networks course (i have a background in C++ and JAVA). i'm trying to combine the two classes.
My questions stems from a networks programming homework assignment below:
"Using the operating system and language of your choice, develop a program to... (5 Replies)
Hello all,
I need to develop an application that would be used as a simulator to test various custom algorithms. As I have never embarked on this kind of work, I need some advice:
1. Which GUI library to use in Linux, GTK+ or FLTK? The simulator application needs to output various... (2 Replies)
Hi guys,
I want to execute an SQL script based on a condition.... I am writing a sample requirement...
num = {some value}
if(num == 0)
then
cat>> test.sql <<FIN
select * from table_a
FIN
else
cat>> test.sql << FIN
select * from table_b
FIN
fi
This is what i... (3 Replies)
Hello Folks,
i have written a script to nullify the log files in my dev environment but the log files are not getting nullified.Please find below my script and also thank you all in advance for your help.
find /app -size +100000 -xdev -exec du -k {} \; 2>/dev/null | sort -nr |ls -1dF ... (2 Replies)
/usr/sbin/ifconfig -a | grep "inet" | grep -v "inet6" | grep -v "127.0.0.1" |
grep -v "0.0.0.0"|grep -v "192.168.100.2" | awk '{print $2}'
I use above command to get IP addresses on AIX boxes.Values coming here are set to a variable "Host IPs.IP Addresses" in my fingerprinting engine.
... (4 Replies)
All,
I would like to know my below requirement can be achieved in any way in Shell Scripting? I will make this requirement of mine as understandable as I can.
Requirement:
I wrote a script 'my.script' which gets user-input tablenames and puts the same into an array. Also I get other inputs... (6 Replies)
Scenario:
Command used to capture IPs on a host:
/usr/sbin/ifconfig -a | grep "inet" | egrep -v "inet6|0.0.0.0|192.168.100.2" | awk '{print $2}'
Following for loop used to capture interface names:
for INTERFACE in `/usr/sbin/ifconfig -a | nawk '$1 ~ /:$/ && $1 {sub(":$", "", $1); print... (3 Replies)
Evening all,
Im trying to get a script that will:
Select the most 3 recent files in a specific directory
Run a command on them (like chmod)
Ask of you would like to continue
Copy the files to another directory
If a linux guru could help me out, it would be very much appreciated.
Thanks... (2 Replies)
I am a newbie Oracle DBA. All our oracle servers are hosted in AIX and Solaris Environment. I have no knowledge about this Unix O/S. So, it will be great if anyone here can suggest me any good book which will teach me the basics.
Any inputs/suggestions will be great for me. (1 Reply)
I am trying to create an Expect script that does the following:
1) Telnets to an IP address and logs in with user ID and Password
2) Issue a CLI command to the server that will output data of which I am particularly interested in a DS1 clock 'Slips' value. I want to be able to keep issuing... (0 Replies)
Discussion started by: dwightlaidler
0 Replies
LEARN ABOUT OSX
posix_madvise
MADVISE(2) BSD System Calls Manual MADVISE(2)NAME
madvise, posix_madvise -- give advice about use of memory
SYNOPSIS
#include <sys/mman.h>
int
madvise(void *addr, size_t len, int advice);
int
posix_madvise(void *addr, size_t len, int advice);
DESCRIPTION
The madvise() system call allows a process that has knowledge of its memory behavior to describe it to the system. The advice passed in may
be used by the system to alter its virtual memory paging strategy. This advice may improve application and system performance. The behavior
specified in advice can only be one of the following values:
MADV_NORMAL Indicates that the application has no advice to give on its behavior in the specified address range. This is the system
default behavior. This is used with madvise() system call.
POSIX_MADV_NORMAL
Same as MADV_NORMAL but used with posix_madvise() system call.
MADV_SEQUENTIAL Indicates that the application expects to access this address range in a sequential manner. This is used with madvise()
system call.
POSIX_MADV_SEQUENTIAL
Same as MADV_SEQUENTIAL but used with posix_madvise() system call.
MADV_RANDOM Indicates that the application expects to access this address range in a random manner. This is used with madvise() system
call.
POSIX_MADV_RANDOM
Same as MADV_RANDOM but used with posix_madvise() system call.
MADV_WILLNEED Indicates that the application expects to access this address range soon. This is used with madvise() system call.
POSIX_MADV_WILLNEED
Same as MADV_WILLNEED but used with posix_madvise() system call.
MADV_DONTNEED Indicates that the application is not expecting to access this address range soon. This is used with madvise() system call.
POSIX_MADV_DONTNEED
Same as MADV_DONTNEED but used with posix_madvise() system call.
MADV_FREE Indicates that the application will not need the information contained in this address range, so the pages may be reused
right away. The address range will remain valid. This is used with madvise() system call.
MADV_ZERO_WIRED_PAGES
Indicates that the application would like the wired pages in this address range to be zeroed out if the address range is
deallocated without first unwiring the pages (i.e. a munmap(2) without a preceding munlock(2) or the application quits).
This is used with madvise() system call.
The posix_madvise() behaves same as madvise() except that it uses values with POSIX_ prefix for the advice system call argument.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
madvise() fails if one or more of the following are true:
[EINVAL] The value of advice is incorrect.
[EINVAL] The address range includes unallocated regions.
[ENOMEM] The virtual address range specified by the addr and len are outside the range allowed for the address space.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
int
madvise(caddr_t addr, size_t len, int advice);
int
posix_madvise(caddr_t addr, size_t len, int advice);
The include file <sys/types.h> is necessary. The type of addr has changed.
SEE ALSO mincore(2), minherit(2), mprotect(2), msync(2), munmap(2), compat(5)HISTORY
The madvise function first appeared in 4.4BSD. The posix_madvise function is part of IEEE 1003.1-2001 and was first implemented in Mac OS X
10.2.
BSD June 9, 1993 BSD