Hi all,
I use mbuff module (v0.6.2) to share memory between user and
kernel space.
But after the allocation of mbuff memory, the user process
does a fork(). And when the son dies, I have the message
"closing unknown mbuff c23ed5a0"
But the communication via mbuff works well.
Is it a problem?
Can we use mbuff and fork() in the same user process?
Many thanks.
Clint
PS: code of the user process.
volatile mbf_str_t *buf;
unsigned char str[512];
void father () {
while (1) {
printf("String to write :");
scanf("%s", str);
while (buf->sh_flg & SHM_WRITE) {
printf("WAIT : buffer NOT free!\n");
sleep(5);
}
memcpy((char *)buf->sh_msg, str, strlen(str));
buf->sh_msg[strlen(str)] = 0;
buf->sh_flg |= SHM_WRITE;
if (str[0] == 'q') {
break;
}
}
mbuff_free(SHM_NAME, (void*)buf);
return;
}
void son() {
printf("Start son: buf = 0x%p \n", buf);
sleep(5);
printf("End son\n");
exit(0);
}
int main (int argc,char *argv[]){
pid_t pid;
buf = (volatile mbf_str_t *)mbuff_alloc(SHM_NAME, SHM_SIZE);
if (buf == NULL) {
printf("mbuff_alloc failed\n");
exit(2);
}
printf("adresse du pointeur : %p\n", buf);
if ((pid = fork()) < 0) {
perror("fork");
exit(1);
}
if (pid == 0) {
son();
} else {
printf("pid of son: %d\n", pid);
father();
}
printf("End main\n");
exit(1);
}
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