/** \brief Get a POSIX shared object identifier for a shared
* memory segment by name
*
* \b os_posix_getShmObjName tries to find a POSIX shared object
* name for a named shared memory segment by calling \b os_posix_findKeyFile.
*
* If the shared object identifier is not found, one is created by
* calling \b mkstemp. And an related key file is produced containing
* the name, the map address and the size. The name of the shared object
* identifier is returned.
*
* If the shared object identifier is found, it's name is returned.
*
* The name of the shared object is equal to the path of the related
* key file except for the leading "/tmp/"
*/
static char *
os_posix_getShmObjName (
const char *name,
void *map_address,
os_address size,
const int id)
{
int key_file_fd;
char *key_file_name;
unsigned int name_len;
char *db_file_name;
char buffer[50];
key_file_name = os_posix_findKeyFileByIdAndName (id,name);
if (key_file_name == NULL) {
if (map_address != NULL) {
name_len = strlen (os_posix_key_file_prefix) + 1;
key_file_name = os_malloc (name_len);
if (key_file_name != NULL) {
snprintf (key_file_name, name_len, "%s", os_posix_key_file_prefix);
key_file_fd = os_mkstemp (key_file_name);
write (key_file_fd, name, strlen(name) + 1);
write (key_file_fd, "\n", 1);
snprintf (buffer, sizeof (buffer), PA_ADDRFMT"\n", (PA_ADDRCAST)map_address);
write (key_file_fd, buffer, strlen(buffer));
snprintf (buffer, sizeof (buffer), PA_ADDRFMT"\n", (PA_ADDRCAST)size);
write (key_file_fd, buffer, strlen(buffer));
snprintf (buffer, sizeof (buffer), "POSIX-SMO\n");
write (key_file_fd, buffer, strlen(buffer));
snprintf (buffer, sizeof (buffer), "%d\n", getpid());
write (key_file_fd, buffer, strlen(buffer));
snprintf(buffer, sizeof (buffer), "%d\n", id);
write(key_file_fd, buffer, strlen(buffer));
close (key_file_fd);
}
}
}
if (key_file_name != NULL) {
db_file_name = os_malloc(strlen(key_file_name));
if (db_file_name != NULL) {
os_strcpy (db_file_name, "/");
os_strcat (db_file_name, &key_file_name[4]);
}
os_free (key_file_name);
} else {
db_file_name = NULL;
}
return db_file_name;
}
char *
os_findKeyFileByNameAndId(
const char * name,
const os_int32 id)
{
char* result;
os_sharedAttr shmAttr;
os_sharedAttrInit(&shmAttr);
result = NULL;
switch (shmAttr.sharedImpl) {
case OS_MAP_ON_FILE:
result = os_posix_findKeyFileByIdAndName(id, name);
break;
case OS_MAP_ON_SEG:
result = os_svr4_findKeyFileByNameAndId(name, id);
break;
case OS_MAP_ON_HEAP:
result = NULL;
break;
}
return result;
}
