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i must close server after a specific user input, such as FINE, if i put a test inside function "maiuscolatore" i receive an error on second recv of client. why?

below there are code of client and...

i've made a simple program that change a string from lowercase to uppercase and from uppercase to lowercase. Server works until start client, after client run server give this error: "recv server...

thanks a lot now it works very well

how can i send an integer via message queue?
i try this, but it doesn't work, child process receive 13345943 instead of 5

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include...

execvp required only two argument...

no one can help me?

nothing also with buffer[4] i've same error on output...

yes but also if i use buffer[3] instead buffer[2], return same error, i have already thought that was an error of memory segment, but if i try all possibilities.
if i use IPC_CREAT i've same error...

i've another problem, now i want to add two numbers and print result, two number are written in the first and second elements of buffer of shared memory and after call an adder program and he make...

thanks now it works very well, i've a very last question...:rolleyes: where i find manual of mode flags?

the first:

#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
int a=5,b=7;
key_t keyshm; // or...

if i use key_t shmkey=0x200;
it doesn't work, it gives segmentation fault and also if i use ftok function...
maybe i'm wrong to use ftok(), which type of file i use in path argument?

thanks a lot for your exhaustive answer, i will try soon

---------- Post updated at 05:06 PM ---------- Previous update was at 04:26 PM ----------

so, for example i have to declare :

key_t...

i have to shared a variable between two different c programs with shared memory and i do these:

int main() {
int a=5,b=7;
int buffer[1];
int *point;
int shmid;
...

i use gcc 4.6.1 under ubuntu 11.10


thanks a lot i solved this problem :rolleyes:

i made this program but when i compile this code, compiler make this error, is an error on wait() system call but argumenti is right, or not?:

esercizio.c:80:9: error: incompatible type for...

i solved with this code:

if [ $(echo $LETTER|grep '[A-Z]') ]; then
lettera=`echo $LETTER|tr [A-Z] [a-z]`;
fi;

yes but i must put the letter translate into $LETTER

how can i check if
read -n 1 LETTER;
LETTER is a capital letter and after translate in minuscule.
i have thought with:
tr [A-Z] [a-z]
or no?

how to compare to arrays to check if each elements of the first are the same of the second?

for ((i=0;i<$LENGTH;i++)) ; do
for (j=0;j<$LENGTH;j++)) ; do
if [ ${ARR1[i]} ==...

if the user at the first read command insert "a" at the next iteration of while the user can insert [b-z]... if the users insert "f" the next [b-z] but without "f" and so on...

i have this problem:
i must hide a string with a character such as _ by command
WORD=string;
XXX=`echo $WORD | sed 's/[a-z]/_/g'
but after, users must send in input a character and i must to...

thanks a lot :D

thanks :D

---------- Post updated at 01:34 PM ---------- Previous update was at 10:11 AM ----------

instead if i want to put every chars on a different variables for each chars?

last=${#VARIABLE}
for ((i=0;i<$last;i++)) ; do
CAR=${VARIABLE:i:1};
echo $CAR;
done