我尝试修复遗留代码中的一些错误。这是代码：
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <sys/msg.h>
#include "libSvr.h"
#define CONEC 3
#define CONFIG 4
typedef struct {
long type;
int cmd;
int id;
char data[7000];
} msg;
typedef struct {
int id[100];
unsigned long ip[100];
int type[100];
char name[100][20];
int num;
} conec;
typedef struct {
char ip;
char svr;
} param_cfg;
typedef struct {
unsigned long my_ip;
unsigned long svr_ip;
} tcp_cfg;
msg client, server;
conec conec_tab;
param_cfg param;
tcp_cfg setup;
void *Receive_MSG(void *arg) {
int i;
while (1) {
if ( msgrcv(msgkey,&client,7008,2,0) != -1 ) {
switch (client.cmd) {
case CONEC:
memmove((char*)&conec_tab,client.data,sizeof(conec_tab));
printf("\n%d\n",conec_tab.num);
break;
case CONFIG:
switch (conec_tab.type[client.id]) {
case 0:
memmove((char*)¶m,&client.data[sizeof(param_cfg)],sizeof(param_cfg));
printf("------------PARAM Config------------\n");
printf("%c\n%c\n\n",param.ip,param.svr);
break;
case 1:
memmove((char*)&setup,client.data,sizeof(tcp_cfg));
printf("\n------------Setup------------\n");
printf("%s\n",Inet_ntoa(setup.my_ip));
break;
}
}
}
}
}
void send_msg() {
msgsnd(msgkey,&(server.type),7008,0);
}
void Process(char *command) {
server.type = 1;
if ( !strncmp(command,"text",8) ) {
server.cmd = 1;
send_text();
send_msg();
}
else if ( !strncmp(command,"image",9) ) {
server.cmd = 2;
send_image();
send_msg();
}
else
printf("\nCommand not found.\n");
}
int main()
{
int i;
char cmd[100];
msgkey=msgget(100,0);
if ( msgkey == -1) {
printf("ERROR msgkey!!");
exit(1);
}
pthread_t receive;
pthread_create(&receive,NULL,Receive_MSG,NULL);
do {
printf("Enter a command -> ");
if (fgets(cmd,100,stdin) == NULL) {
printf("error");
exit(1);
}
cmd[strlen(cmd)-1]='\0';
if ( (strcmp(cmd,"exit")) && (strcmp(cmd,"")) )
Process(cmd);
} while (strcmp(cmd,"exit"));
return 0;
}
libSvr.h代码：
#ifndef LIBSVR_H
#define LIBSVR_H
#pragma pack(push,1)
#pragma pack(1)
extern "C" void send_text();
extern "C" void send_image();
#pragma pack(pop)
#endif
线程receive只是从队列标识msgkey中的另一个应用程序接收一些消息并打印一些文本。
问题是当我进入do while循环时，我需要获取一些用户输入，fgets失败...当我打印错误（使用errno）时，我看到了这是一个错误的文件描述符错误（EBADF）。
Process函数让命令a调用相应的函数，它基本上会通过套接字发送一些数据。 Process调用的这些函数来自用C ++编写的函数C extern-ed的lib（libSvr）。
我正在使用带有gcc 4.7.2的ubuntu 12.10机器。
我试图在预处理器（使用gcc -E）和stdin之后看到代码仍显示为stdin。我尝试打印fileno(stdin)的输出，它是0（我看到某个地方它的值正确），然后我尝试以这种方式调用fgets：fgets(cmd,100,0)。但没有任何作用。
任何人都知道发生了什么事？
谢谢！
修改
包含所有代码。
我尝试拨打gets()，scanf()和read()，并对线程创建（pthread_create）发表评论，但没有任何变化。
我运行了命令strace -s2000 -etrace=open,close <MYPROGRAM>，这是输出：
open("/mnt/hgfs/projects/tls/i686/sse2/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/i686/sse2/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/i686/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/i686/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/sse2/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/sse2/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/tls/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/i686/sse2/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/i686/sse2/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/i686/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/i686/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/sse2/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/sse2/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/cmov/libSvr.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/mnt/hgfs/projects/libSvr.so.1", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/mnt/hgfs/projects/libpthread.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/lib/i386-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/mnt/hgfs/projects/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/mnt/hgfs/projects/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/lib/i386-linux-gnu/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/mnt/hgfs/projects/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
open("/mnt/hgfs/projects/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
close(3) = 0
close(0) = 0
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
close(0) = -1 EBADF (Bad file descriptor)
Enter a command ->
errorEnter a command ->
errorEnter a command ->
errorEnter a command ->
因此，stdin文件描述符正在关闭，但现在我需要知道它在哪里关闭。
我现在正在学习一些howto和strace的手册页，因为我以前从未使用它。
欢迎任何帮助和提示。
再次感谢！
答案 0 :(得分：1)
我让你的代码运行一些变化。我没有设法让System V-stuff工作，但是我让它在没有崩溃的情况下读取命令。
我认为程序中System V-stiff的初始化是错误的，并且会产生未定义的行为。
所有close(0) - s可能来自某个地方的服务器线程，它不会从错误的while循环中断开。
System V的初始化（我不知道如何使用它，真的，只是阅读man-pages），我确实喜欢这个：
// msg_key is declared above the server-code (used by both) like `key_t msg_key`
msg_key = ftok ("/home/atle/prog/test.c", 'A');
if (msg_key == -1) {
printf ("ftok error: %s\n", strerror(errno));
exit(1);
}
msgkey = msgget(msg_key, IPC_CREAT);
if ( msgkey == -1) {
printf ("msgget error: %s\n", strerror(errno));
exit(1);
}
在服务器中，我确实喜欢这样：
int msgkey_server = msgget(msg_key, 0);
if ( msgkey_server == -1) {
printf ("Server msgget error: %s\n", strerror(errno));
exit(1);
}
while (1) {
printf ("Server loop\n");
if ( msgrcv(msgkey_server,&client,sizeof(client),0,0) == -1 ) {
printf ("Server read error: %s\n", strerror(errno));
exit(1);
}
else {
// MSG READ OK
}
顺便说一句：
当你将一个struct传递给一个附加了它的大小的命令时，你应该像我在这里一样使用sizeof()，而不是手动编写大小（导致问题）。
额外BTW：
你需要errno-header：
#include <errno.h>