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# PR_DetachSharedMemory
Unmaps a shared memory segment identified by name.
## Syntax
```{code}
#include <prshm.h>
NSPR_API( PRStatus )
PR_DetachSharedMemory(
PRSharedMemory *shm,
void *addr
);
```
### Parameters
The function has these parameters:
shm
: The handle returned from {ref}`PR_OpenSharedMemory`.
addr
: The address to which the shared memory segment is mapped.
### Returns
{ref}`PRStatus`.