# shminfo
## **Overview**
**Related Modules:**
[MEM](MEM.md)
**Description:**
Describes limitations and attributes of system-level shared memory.
## **Summary**
## Data Fields
## **Details**
## **Field Documentation**
## \_\_unused
```
unsigned long shminfo::__unused[4]
```
**Description:**
Reserved
## shmall
```
unsigned long shminfo::shmall
```
**Description:**
Maximum size of all shared memory segments allowed by the system
## shmmax
```
unsigned long shminfo::shmmax
```
**Description:**
Maximum size of a shared memory segment allowed by the system
## shmmin
```
unsigned long shminfo::shmmin
```
**Description:**
Minimum size of a shared memory segment allowed by the system
## shmmni
```
unsigned long shminfo::shmmni
```
**Description:**
Maximum number of shared memory segments allowed by the system
## shmseg
```
unsigned long shminfo::shmseg
```
**Description:**
Maximum number of shared memory segments that can be attached by a process