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操作系统Interprocess Communication（IPC）实验源码。 在Unix的内核环境中

compile:
	gcc -o msgtool msgtool.c
run:

./msgtool s 1 hello,world
Sending a message...

./msgtool s 5 happy
Sending a message...

./msgtool r 1
Reading a message...
Type: 1 Text: hello,world

./msgtool r 5
Reading a message...
Type: 5 Text: happy

ipcs -q

------ Semaphore Arrays --------
key        semid      owner      perms      nsems      status      

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages    
0x6d0760c2 65536      root       666        0            0           

./msgtool m 660
ipcs -q

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages    
0x6d0760c2 65536      root       660        0            0           

./msgtool d
ipcs -q

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages