As explained many times in the last 2 pages, that sets all three arrays to the SAME MEMORY. It doesn't matter where you put that wrong code, it doesn't make it right code.
ooo
sorry!
i try it this way too but i forgot a line with shmat and it gave me only zeros.
Thanks for everything, now i have to work for the other...
Thanks for your time!
Hi
$ a=10 ; b=2
$ expr $a + $b
12
$ expr $a - $b
8
$ expr $a / $b
5
$ expr $a * $b
expr: syntax error
Any idean why I am getting this error only when multiplying two numbers. Whats the exact syntax?
Thanks a lot to all in advance
CSaha (5 Replies)
Is there a way that i can get something like this to work:
Number=`expr 80 \* 10.69`
i.e. To multiply an integer by a decimal or a decimal by a decimal etc...?
thanks (10 Replies)
Hello! I'm trying to make a script that will make a list of the files in a source tree and sort them by size. Problem is I've run into a weird problem.
print array will give me numbers like 160, 220, 444 that i don't even know where they come from, and print array will give me the correct numbers... (5 Replies)
Im trying to write some code atm which gets the complete pathname of a folder and strips off references to the parent folders. The end result should be just the name of the folder.
Currently Im able to extract the folder name, however Im getting junk added onto the name as well which is making... (7 Replies)
Hi All,
I have a problem assigning variables to script.I have a script in which i have a while loop now i have to assign some values obtained to an array which will be used later in the script.Can anyone help how to do that.
At present my scrot looks like:
co=0
pco=0
co=`cat /tmp/highcpu... (4 Replies)
Hi
I have two arrays:
arr1 = (demo demo2 demo3 demo4 demo5)
arr2 = (demo2 test demo)
I want to check that the values the "arr2" are present in "arr1"
Example
arr1 = (demo demo2 demo3 demo4 demo5)
arr2 = (demo2 test demo)
Output: Error
arr1 = (demo demo2 demo3 demo4 demo5)... (3 Replies)
if i declare both but don't input any variables what values will the int array and file pointer array have on default, and if i want to reset any of the elements of both arrays to default, should i just set it to 0 or NULL or what? (1 Reply)
Hello ,
im sorry for my english .
im trying to create a dynamic menu that will display if the interface is ACTIVE OR STOPPED/FAILED
for some reason i cant get it to work properly
start_interface_func()
{
i=0
for interface_chk in 11 71 73 72 12 47 48 49 50 20 23 24 25 46 21 22 27 28... (5 Replies)
I am trying to take all the elements of an array and multiply them by 2, and then copy them to a new array. Here is what I have
i=0
for true in DMGLIST
do
let DMGSIZES2="${DMGSIZES}"*2
let i++
done
unset i
echo ${DMGSIZES2}
It does the calculation correctly for the first element,... (7 Replies)
HI,
i am trying to multiply 2 2D arrays (a,b) using fork.
The answer will be at c.
Each child have to calculate 1 row of c.
The code is right, as i think of it, with no errors but i dont get the correct c array...
I think there is maybe a mistake in i dimension ...
Anyway, here is the code:
... (16 Replies)
Discussion started by: giampoul
16 Replies
LEARN ABOUT OSX
shmat
SHMAT(2) BSD System Calls Manual SHMAT(2)NAME
shmat, shmdt -- map/unmap shared memory
SYNOPSIS
#include <sys/shm.h>
void *
shmat(int shmid, const void *shmaddr, int shmflg);
int
shmdt(const void *shmaddr);
DESCRIPTION
shmat() maps the shared memory segment associated with the shared memory identifier shmid into the address space of the calling process. The
address at which the segment is mapped is determined by the shmaddr parameter. If it is equal to 0, the system will pick an address itself.
Otherwise, an attempt is made to map the shared memory segment at the address shmaddr specifies. If SHM_RND is set in shmflg, the system will
round the address down to a multiple of SHMLBA bytes (SHMLBA is defined in <sys/shm.h> ). A shared memory segment can be mapped read-only by
specifying the SHM_RDONLY flag in shmflg. shmdt() unmaps the shared memory segment that is currently mapped at shmaddr from the calling
process' address space. shmaddr must be a value returned by a prior shmat() call. A shared memory segment will remain existant until it is
removed by a call to shmctl(2) with the IPC_RMID command.
RETURN VALUES
shmat() returns the address at which the shared memory segment has been mapped into the calling process' address space when successful,
shmdt() returns 0 on successful completion. Otherwise, a value of -1 is returned, and the global variable errno is set to indicate the error.
ERRORS
The shmat() system call will fail if:
[EACCES] The calling process has no permission to access this shared memory segment.
[EINVAL] shmid is not a valid shared memory identifier. shmaddr specifies an illegal address.
[EMFILE] The number of shared memory segments has reached the system-wide limit.
[ENOMEM] There is not enough available data space for the calling process to map the shared memory segment.
The shmdt() system call will fail if:
[EINVAL] shmaddr is not the start address of a mapped shared memory segment.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
The include files <sys/types.h> and <sys/ipc.h> are necessary for both functions.
SEE ALSO mmap(2), shmctl(2), shmget(2), compat(5)BSD August 17, 1995 BSD