BSD syscall#258
svc · unix #258
msgctl
Performs control operations on a System V message queue (stat, set, remove).
Prototype
int msgctl(int msqid, int cmd, struct msqid_ds *buf);Returns: int
Arguments
| Name | Type | Dir | Description |
|---|---|---|---|
| msqid | int | - | |
| cmd | int | - | |
| buf | struct msqid_ds | - |
Version history
| XNU tag | macOS | # |
|---|---|---|
| xnu-1456.1.26 | macOS 10.6 Snow Leopard | 258 |
| xnu-1486.2.11 | — | 258 |
| xnu-1504.15.3 | — | 258 |
| xnu-1504.3.12 | — | 258 |
| xnu-1504.7.4 | — | 258 |
| xnu-1504.9.17 | — | 258 |
| xnu-1504.9.26 | — | 258 |
| xnu-1504.9.37 | — | 258 |
Notes
Supports IPC_STAT, IPC_SET and IPC_RMID. On macOS the System V IPC subsystem is gated by the kern.sysv.* sysctls and is rarely used by first-party software, which prefers Mach ports or XPC. Sandboxed processes typically have IPC_CREAT denied outright.
Related APIs
msggetmsgsndmsgrcvipcsipcrm