int _mmap_segment_create(pmix_sm_seg_t *sm_seg, const char *file_name, size_t size)
{
int rc = PMIX_SUCCESS;
void *seg_addr = MAP_FAILED;
pid_t my_pid = getpid();
_segment_ds_reset(sm_seg);
/* enough space is available, so create the segment */
if (-1 == (sm_seg->seg_id = open(file_name, O_CREAT | O_RDWR, 0600))) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call open(2) fail\n");
rc = PMIX_ERROR;
goto out;
}
/* size backing file - note the use of real_size here */
if (0 != ftruncate(sm_seg->seg_id, size)) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call ftruncate(2) fail\n");
rc = PMIX_ERROR;
goto out;
}
if (MAP_FAILED == (seg_addr = mmap(NULL, size,
PROT_READ | PROT_WRITE, MAP_SHARED,
sm_seg->seg_id, 0))) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call mmap(2) fail\n");
rc = PMIX_ERROR;
goto out;
}
sm_seg->seg_cpid = my_pid;
sm_seg->seg_size = size;
sm_seg->seg_base_addr = (unsigned char *)seg_addr;
(void)strncpy(sm_seg->seg_name, file_name, PMIX_PATH_MAX - 1);
out:
if (-1 != sm_seg->seg_id) {
if (0 != close(sm_seg->seg_id)) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call close(2) fail\n");
rc = PMIX_ERROR;
}
}
/* an error occured, so invalidate the shmem object and munmap if needed */
if (PMIX_SUCCESS != rc) {
if (MAP_FAILED != seg_addr) {
munmap((void *)seg_addr, size);
}
_segment_ds_reset(sm_seg);
}
return rc;
}
static int _mmap_segment_detach(pmix_pshmem_seg_t *sm_seg)
{
int rc = PMIX_SUCCESS;
if (0 != munmap((void *)sm_seg->seg_base_addr, sm_seg->seg_size)) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call munmap(2) fail\n");
rc = PMIX_ERROR;
}
/* reset the contents of the pmix_sm_seg_t associated with this
* shared memory segment.
*/
_segment_ds_reset(sm_seg);
return rc;
}
static int _mmap_segment_create(pmix_pshmem_seg_t *sm_seg, const char *file_name, size_t size)
{
int rc = PMIX_SUCCESS;
void *seg_addr = MAP_FAILED;
pid_t my_pid = getpid();
_segment_ds_reset(sm_seg);
/* enough space is available, so create the segment */
if (-1 == (sm_seg->seg_id = open(file_name, O_CREAT | O_RDWR, 0600))) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call open(2) fail\n");
rc = PMIX_ERROR;
goto out;
}
/* size backing file - note the use of real_size here */
#ifdef HAVE_POSIX_FALLOCATE
if (0 != (rc = posix_fallocate(sm_seg->seg_id, 0, size))) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call posix_fallocate(2) fail\n");
if (ENOSPC == rc) {
rc = PMIX_ERR_OUT_OF_RESOURCE;
goto out;
} else if ((ENOTSUP != rc)
#ifdef EOPNOTSUPP
&& (EOPNOTSUPP != rc)
#endif
){
rc = PMIX_ERROR;
goto out;
}
/* else:
* Not supported by OS and/or filesystem.
* Must fall-back to ftruncate().
*/
} else {
goto map_memory;
}
#endif
if (0 != ftruncate(sm_seg->seg_id, size)) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call ftruncate(2) fail\n");
rc = PMIX_ERROR;
goto out;
} else {
rc = PMIX_SUCCESS;
}
#ifdef HAVE_POSIX_FALLOCATE
map_memory:
#endif
if (MAP_FAILED == (seg_addr = mmap(NULL, size,
PROT_READ | PROT_WRITE, MAP_SHARED,
sm_seg->seg_id, 0))) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call mmap(2) fail\n");
rc = PMIX_ERROR;
goto out;
}
sm_seg->seg_cpid = my_pid;
sm_seg->seg_size = size;
sm_seg->seg_base_addr = (unsigned char *)seg_addr;
(void)strncpy(sm_seg->seg_name, file_name, PMIX_PATH_MAX - 1);
out:
if (-1 != sm_seg->seg_id) {
if (0 != close(sm_seg->seg_id)) {
pmix_output_verbose(2, pmix_globals.debug_output,
"sys call close(2) fail\n");
rc = PMIX_ERROR;
}
}
/* an error occured, so invalidate the shmem object and munmap if needed */
if (PMIX_SUCCESS != rc) {
if (MAP_FAILED != seg_addr) {
munmap((void *)seg_addr, size);
}
_segment_ds_reset(sm_seg);
}
return rc;
}
