//ust// #include <linux/cpu.h>
//ust// #include <linux/splice.h>
//ust// #include <linux/bitops.h>
-#include <sys/mman.h>
#include "kernelcompat.h"
+#include <sys/mman.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
#include "list.h"
#include "relay.h"
#include "channels.h"
unsigned int n_pages;
struct buf_page *buf_page, *n;
- void *result;
+ void *ptr;
+ int result;
*size = PAGE_ALIGN(*size);
- /* Maybe do read-ahead */
- result = mmap(NULL, *size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- if(result == MAP_FAILED) {
- PERROR("mmap");
+ result = buf->shmid = shmget(getpid(), *size, IPC_CREAT | IPC_EXCL | 0700);
+ if(buf->shmid == -1) {
+ PERROR("shmget");
+ return -1;
+ }
+
+ ptr = shmat(buf->shmid, NULL, 0);
+ if(ptr == (void *) -1) {
+ perror("shmat");
+ goto destroy_shmem;
+ }
+
+ /* Already mark the shared memory for destruction. This will occur only
+ * when all users have detached.
+ */
+ result = shmctl(buf->shmid, IPC_RMID, NULL);
+ if(result == -1) {
+ perror("shmctl");
return -1;
}
- buf->buf_data = result;
+ buf->buf_data = ptr;
buf->buf_size = *size;
return 0;
+
+ destroy_shmem:
+ result = shmctl(buf->shmid, IPC_RMID, NULL);
+ if(result == -1) {
+ perror("shmctl");
+ }
+
+ return -1;
}
/**
//ust// return 0;
//ust// }
+static char initialized = 0;
+
void __attribute__((constructor)) init_ustrelay_transport(void)
{
- ltt_transport_register(&ust_relay_transport);
+ if(!initialized) {
+ ltt_transport_register(&ust_relay_transport);
+ initialized = 1;
+ }
}
static void __exit ltt_relay_exit(void)