[root@localhost myunp2]# vim ftok.c
[root@localhost myunp2]# gcc -o ftok ftok.c 
/tmp/ccxRydhw.o: In function `main':
ftok.c:(.text+0x18): undefined reference to `err_quit'
ftok.c:(.text+0x30): undefined reference to `Stat'
ftok.c:(.text+0x48): undefined reference to `Ftok'
collect2: 错误：ld 返回 1
[root@localhost myunp2]# gcc -o ftok ftok.c -lunpipc
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_open':
wrapunix.c:(.text+0x4d8): undefined reference to `mq_open'
wrapunix.c:(.text+0x4f0): undefined reference to `mq_open'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_close':
wrapunix.c:(.text+0x52b): undefined reference to `mq_close'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_unlink':
wrapunix.c:(.text+0x55b): undefined reference to `mq_unlink'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_send':
wrapunix.c:(.text+0x5a3): undefined reference to `mq_send'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_receive':
wrapunix.c:(.text+0x5e3): undefined reference to `mq_receive'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_notify':
wrapunix.c:(.text+0x623): undefined reference to `mq_notify'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_getattr':
wrapunix.c:(.text+0x653): undefined reference to `mq_getattr'
/usr/lib/libunpipc.a(wrapunix.o): In function `Mq_setattr':
wrapunix.c:(.text+0x68b): undefined reference to `mq_setattr'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_open':
wrapunix.c:(.text+0x9c8): undefined reference to `sem_open'
wrapunix.c:(.text+0x9e0): undefined reference to `sem_open'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_close':
wrapunix.c:(.text+0xa1b): undefined reference to `sem_close'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_unlink':
wrapunix.c:(.text+0xa4b): undefined reference to `sem_unlink'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_init':
wrapunix.c:(.text+0xa8b): undefined reference to `sem_init'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_destroy':
wrapunix.c:(.text+0xabb): undefined reference to `sem_destroy'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_wait':
wrapunix.c:(.text+0xaeb): undefined reference to `sem_wait'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_trywait':
wrapunix.c:(.text+0xb1c): undefined reference to `sem_trywait'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_post':
wrapunix.c:(.text+0xb5b): undefined reference to `sem_post'
/usr/lib/libunpipc.a(wrapunix.o): In function `Sem_getvalue':
wrapunix.c:(.text+0xb93): undefined reference to `sem_getvalue'
/usr/lib/libunpipc.a(wrapunix.o): In function `Shm_open':
wrapunix.c:(.text+0xccc): undefined reference to `shm_open'
/usr/lib/libunpipc.a(wrapunix.o): In function `Shm_unlink':
wrapunix.c:(.text+0xd0b): undefined reference to `shm_unlink'
collect2: 错误：ld 返回 1
[root@localhost myunp2]# gcc -lrt -o ftok ftok.c -lunpipc
[root@localhost myunp2]# man mq_open
Cannot open the message catalog "man" for locale "zh_CN.UTF-8"
(NLSPATH="/usr/share/locale/%l/LC_MESSAGES/%N")

Formatting page, please wait...

[root@localhost myunp2]# gcc -lrt -o slot slot.c -lunpipc
slot.c: 在函数‘main’中:
slot.c:8:22: 错误：‘IPC_PRIVATE’未声明(在此函数内第一次使用)
         msqid=Msgget(IPC_PRIVATE,SVMSG_MODE|IPC_CREAT);
                      ^
slot.c:8:22: 附注：每个未声明的标识符在其出现的函数内只报告一次
In file included from slot.c:1:0:
unpipc.h:153:21: 错误：‘MSG_R’未声明(在此函数内第一次使用)
 #define SVMSG_MODE (MSG_R | MSG_W | MSG_R>>3 | MSG_R>>6)
                     ^
slot.c:8:34: 附注：in expansion of macro ‘SVMSG_MODE’
         msqid=Msgget(IPC_PRIVATE,SVMSG_MODE|IPC_CREAT);
                                  ^
unpipc.h:153:29: 错误：‘MSG_W’未声明(在此函数内第一次使用)
 #define SVMSG_MODE (MSG_R | MSG_W | MSG_R>>3 | MSG_R>>6)
                             ^
slot.c:8:34: 附注：in expansion of macro ‘SVMSG_MODE’
         msqid=Msgget(IPC_PRIVATE,SVMSG_MODE|IPC_CREAT);
                                  ^
slot.c:8:45: 错误：‘IPC_CREAT’未声明(在此函数内第一次使用)
         msqid=Msgget(IPC_PRIVATE,SVMSG_MODE|IPC_CREAT);
                                             ^
slot.c:11:22: 错误：‘IPC_RMID’未声明(在此函数内第一次使用)
         Msgctl(msqid,IPC_RMID,NULL);