请编程高手指教
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我在学unix进程间通信----SYSTEM V消息队列的时候遇到如下问题: C# }4 n. M. o; d: w
[root@localhost svmsg]# make2 G$ ~( g O/ s7 o( v
gcc -g -O2 -D_REENTRANT -Wall -c -o ctl.o ctl.c) [) [2 V' f5 Z+ o
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ctl.c: In function `main':$ x9 x0 p$ e+ l( S2 T
ctl.c:8: storage size of `buf' isn't known) R3 x6 M+ m! k$ ?
ctl.c:10: `MSG_R' undeclared (first use in this function)
+ q. u1 ^: }/ |7 wctl.c:10: (Each undeclared identifier is reported only once
3 o- E, G7 k4 X3 g+ D8 rctl.c:10: for each function it appears in.)
4 h% T8 F' @7 w' Dctl.c:10: `MSG_W' undeclared (first use in this function)
% t: S O9 l q7 e- Fctl.c:18: `ulong_t' undeclared (first use in this function): l" g+ `$ h) C: g9 e& W7 L$ Q
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/ I4 g3 @# X( [ k* A# w下面是ctl.c文件( G& U+ g$ Y/ J) m* {$ ?
#include "unpipc.h"
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int
# L, q' D4 b6 S+ Xmain(int argc, char **argv)
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( \& s& \2 I! s/ m int msqid;
* H2 R, U% g! A struct msqid_ds info;3 \+ b% m4 x2 z: y, A
struct msgbuf buf;/*问题所在处*/+ }9 l0 |4 a% K) o
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msqid = Msgget(IPC_PRIVATE, SVMSG_MODE | IPC_CREAT);/*问题所在处*/2 A3 j5 P9 @9 B2 a+ w
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E0 J/ h6 T) _" g+ J! ^ /*other code*/; F4 l0 s) A q! j u0 T0 P+ ~
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下面是unpipc.h文件节选
' i# L# f! u/ f$ Y#ifdef HAVE_SYS_MSG_H
; S9 U: N" ^! _! ]; w* Z" a# include <sys/msg.h> /* System V message queues */* C+ J/ ?, I; J
#endif# }! N& ?5 y C$ f
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#define SVMSG_MODE (MSG_R | MSG_W | MSG_R>>3 | MSG_R>>6)/*问题所在处*/6 |+ X% D' k9 v
/* default permissions for new SV message queues */
$ G- H+ c! ~ x( p' }/ `: P7 `/* $$.ix [SVMSG_MODE]~constant,~definition~of$$ */
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下面是<sys/msg.h>文件
# A5 v8 L2 P' X* @* a#ifdef __USE_GNU- F/ W) H) ]1 h" m+ P& K
/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */" x' s. J" W. A* w) t# q2 g0 P* y: L
struct msgbuf* V, W3 g8 Z$ Z! y( k
{
7 P2 e m" O$ W2 I long int mtype; /* type of received/sent message */' x, a+ U8 t f3 d, Y% L8 ?
char mtext[1]; /* text of the message */1 f! V& Y& I o- z% m
};6 ~3 f& r" z& L& W
#endif
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( ]! C' Y7 v S( F" M. R* A, E请各大虾多多指教！！（我用的是linux7.0)
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