helenm
请教Linux下C编程问题：段错误，fseek
各位大侠，初学linux下c编程，困难重重，还请赐教啊。先谢谢了啊，以下是调试过程：
43 if((connectfd=accept(listenfd,(struct sockaddr *)&client,&sin_size))==-1){
(gdb)
47 process_cli(connectfd,client);
(gdb)
Breakpoint 2, process_cli (connectfd=6, client=
{sin_family = 2, sin_port = 9603, sin_addr = {s_addr = 1728161984}, sin_zero = "瞱/022繲/006/215?"}) at zfpserverT.c:55
55 printf("You got a connection from %s.",inet_ntoa(client.sin_addr));
(gdb)
56 num=recv(connectfd,file_name,SEND_BUFFER_SIZE,0);
(gdb)
57 if(num==0){
(gdb)
62 file_name[num-1]='/0';
(gdb)
63 printf("The filename the client needs is %s./n",file_name);
(gdb)
You got a connection from 192.168.1.103.The filename the client needs is 1.mp3.
64 switch(file_name[0])
(gdb)
79 {sourceFile=fopen("/temp/1.mp3","r");
(gdb)
80 break;
(gdb)
83 leftToSend=sizeof(sourceFile);
(gdb)
84 fseek(sourceFile,0L,SEEK_SET);
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x42069267 in fseek () from /lib/tls/libc.so.6
(gdb) where
#0 0x42069267 in fseek () from /lib/tls/libc.so.6
#1 0x080488b6 in process_cli (connectfd=6, client=
{sin_family = 2, sin_port = 9603, sin_addr = {s_addr = 1728161984}, sin_zero = "瞱/022繲/006/215?"}) at zfpserverT.c:84
#2 0x080487b9 in main () at zfpserverT.c:47
#3 0x42015574 in __libc_start_main () from /lib/tls/libc.so.6