Implement deletion of SysV IPC message queues
As usual also the readme and the man page are updated.
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6 changed files with 103 additions and 6 deletions
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@ -58,10 +58,16 @@ queue. Following optional arguments are supported:
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- `-o,` `--timeout <timeout>`: As for example in "5h 23min 42ms"
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### SysV IPC message queues
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The SysV IPC backend supports one command: `create`.
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The SysV IPC backend supports two commands: `create` and `unlink`.
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#### Create a message queue
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Use the `create` command to create a new SysV IPC message
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queue. Following optional arguments are supported:
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- `-m`, `--mode`: Permissions (octal) to create the queue
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with. Default: 0644.
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#### Delete a message queue
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Use the `unlink` command to delete a message queue. This can either be
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done by providing a `key` or an `id` of the queue:
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- `-i`, `--id <id>`: Id of the queue
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- `-k`, `--key <key>`: Key of the queue
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35
mqrs.1
35
mqrs.1
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@ -192,7 +192,7 @@ Set a different priority than default, priority >= 0 [default: 0]
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Timeout as for example in "5h 23min 42ms"
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.RE
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.SS unlink [FLAGS] \fI<QUEUE>\fP
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Deletes an existing POSIX message queue.
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Delete an existing POSIX message queue.
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.TP 8
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.SS ARGS
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.RS
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@ -211,8 +211,10 @@ Prints help information
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Produce verbose output
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.RE
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.SH SYSV IPC MESSAGE QUEUE SUBCOMMANDS
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The SysV IPC backend supports one command:
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The SysV IPC backend supports two commands:
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.B create\
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and
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.B unlink\
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.
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.SS create [FLAGS] [OPTIONS] \fI<KEY>\fP
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Create a new SysV IPC message queue.
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@ -239,6 +241,35 @@ Produce verbose output
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.B \-m, \-\-mode \fI<mode>\fP
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Permissions (octal) to create the queue with (default: 0644)
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.RE
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.SS unlink [FLAGS] [OPTIONS]
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Delete an existing SysV IPC message queue. It is mandatory to pass
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exactly one OPTION.
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.TP 8
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.SS ARGS
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.RS
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.TP 8
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.B \fI<KEY>\fP
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Key of the new queue
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.RE
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.TP 8
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.SS FLAGS
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.RS
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.TP 8
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.B \-h, \-\-help
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Prints help information
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.TP 8
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.B \-v, \-\-verbose
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Produce verbose output
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.TP 8
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.SS OPTIONS
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.RS
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.TP 8
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.B \-i, \-\-id \fI<id>\fP
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Id of the queue
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.TP 8
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.B \-k, \-\-key \fI<key>\fP
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Key of the queue
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.RE
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.SH SEE ALSO
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mq_overview(7)
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.SH BUGS
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@ -25,6 +25,7 @@ enum PosixCommand {
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#[derive(Clap, Debug)]
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enum SysvCommand {
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Create(sysv::Create),
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Unlink(sysv::Unlink),
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}
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#[derive(Clap, Debug)]
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@ -68,6 +69,7 @@ fn main() -> Result<()> {
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},
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Backend::Sysv(s) => match s {
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SysvCommand::Create(c) => c.run()?,
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SysvCommand::Unlink(u) => u.run()?,
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},
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}
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@ -1,3 +1,5 @@
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mod create;
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mod unlink;
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pub use create::Create;
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pub use unlink::Unlink;
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35
src/sysv/unlink.rs
Normal file
35
src/sysv/unlink.rs
Normal file
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@ -0,0 +1,35 @@
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use anyhow::Result;
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use clap::Clap;
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use log::info;
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/// Delete a message queue
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#[derive(Clap, Debug)]
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pub struct Unlink {
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/// Id of the queue
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#[clap(
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long,
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short,
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required_unless_present_any = &["key"],
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conflicts_with = "key"
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)]
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pub id: Option<i32>,
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/// Key of the queue
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#[clap(long, short, required_unless_present_any = &["id"], conflicts_with = "id")]
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pub key: Option<i32>,
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}
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impl Unlink {
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pub fn run(&self) -> Result<()> {
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if let Some(id) = self.id {
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sysvmq::unlink_id(id)?;
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info!("Removed message queue with id: {}", id);
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} else if let Some(key) = self.key {
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sysvmq::unlink_key(key)?;
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info!("Removed message queue key: {}", key);
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}
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Ok(())
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}
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}
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@ -1,9 +1,9 @@
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use libc::{
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msgget, IPC_CREAT, IPC_EXCL, IPC_INFO, IPC_NOWAIT, IPC_PRIVATE, IPC_RMID, IPC_SET, IPC_STAT,
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MSG_COPY, MSG_EXCEPT, MSG_INFO, MSG_NOERROR, MSG_STAT,
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msgctl, msgget, msqid_ds, IPC_CREAT, IPC_EXCL, IPC_INFO, IPC_NOWAIT, IPC_PRIVATE, IPC_RMID,
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IPC_SET, IPC_STAT, MSG_COPY, MSG_EXCEPT, MSG_INFO, MSG_NOERROR, MSG_STAT,
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};
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use nix::errno::{errno, Errno};
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use std::{marker::PhantomData, num::ParseIntError};
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use std::{marker::PhantomData, num::ParseIntError, ptr};
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use thiserror::Error;
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#[derive(Debug, Error)]
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@ -54,6 +54,27 @@ pub enum ControlCommands {
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MsgInfo = MSG_INFO,
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}
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pub fn unlink_id(id: i32) -> Result<(), SysvMqError> {
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let res = unsafe {
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msgctl(
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id,
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ControlCommands::Remove as i32,
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ptr::null::<msqid_ds>() as *mut msqid_ds,
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)
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};
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match res {
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-1 => Err(SysvMqError::ErrnoError(Errno::from_i32(errno()).desc())),
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_ => Ok(()),
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}
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}
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pub fn unlink_key(key: i32) -> Result<(), SysvMqError> {
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let id = unsafe { msgget(key, 0) };
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unlink_id(id)
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}
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pub struct SysvMq<T> {
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pub id: i32,
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pub key: i32,
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