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：; C& S, W8 \2 S  y; @
43        if((connectfd=accept(listenfd,(struct sockaddr *)&client,&sin_size))==-1){; Q5 i# F/ ~, r8 Z
(gdb)
& R1 Z; W, V3 t47       process_cli(connectfd,client);
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Breakpoint 2, process_cli (connectfd=6, client=; H1 a  J9 |, Y
      {sin_family = 2, sin_port = 9603, sin_addr = {s_addr = 1728161984}, sin_zero = "瞱\022繲\006\215?"}) at zfpserverT.c:55: e# z' Q6 ~. P# s# L$ k
55        printf("You got a connection from %s.",inet_ntoa(client.sin_addr));$ n5 J" W' n$ {+ z! V& V) P/ I
(gdb)
' o1 F/ m  ]; M' Y% t56        num=recv(connectfd,file_name,SEND_BUFFER_SIZE,0);  V( y% j+ B0 b- g- B2 g2 X
(gdb)
$ ?% G- T* D% q9 H5 f- `% A57        if(num==0){/ U) ?0 @; l4 g) c$ I
(gdb)  S! \* v( [% m" S
62        file_name[num-1]='\0';
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: s5 u! H9 i* r( g, B/ e7 i! ?: f; c63        printf("The filename the client needs is %s.\n",file_name);$ b! k  z* ^+ t& P+ c7 e
(gdb)2 K( N! i7 q0 k* @
You got a connection from 192.168.1.103.The filename the client needs is 1.mp3.( ^1 i; T$ N# m$ T  A
64        switch(file_name[0])7 M, F. ?# V8 t1 l  x$ W, Q5 P. P
(gdb)( X  B5 L! e% w4 \! S+ u! R
79                {sourceFile=fopen("/temp/1.mp3","r");/ L- v- h3 u! M$ V
(gdb)/ V) [: d3 e- {' R3 A. b
80                 break;
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83         leftToSend=sizeof(sourceFile);
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3 r+ z- V' o8 @# G) ^84         fseek(sourceFile,0L,SEEK_SET);
# j- p& d8 W/ N# b4 z& E(gdb)
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4 {0 k8 q: }2 fProgram received signal SIGSEGV, Segmentation fault.  ]- o% @8 Y3 k$ m, J) X
0x42069267 in fseek () from /lib/tls/libc.so.6
. W1 X$ T  n; |% q& y+ v) H$ i(gdb) where6 l, Q4 k  i2 X
#0  0x42069267 in fseek () from /lib/tls/libc.so.6) m; @7 J7 K$ _4 ?! q/ q. m: r
#1  0x080488b6 in process_cli (connectfd=6, client=
  F% w6 Y$ |7 \, E- b1 t      {sin_family = 2, sin_port = 9603, sin_addr = {s_addr = 1728161984}, sin_zero = "瞱\022繲\006\215?"}) at zfpserverT.c:84
/ v6 }" X5 C7 O2 A8 g#2  0x080487b9 in main () at zfpserverT.c:47
7 w3 n4 J$ @/ j1 B#3  0x42015574 in __libc_start_main () from /lib/tls/libc.so.6　　　　　　

这种问题别人很难帮你的 可否考虑用 valgrind 跑一下看看　　　　　　

你该贴源代码，而不是调试信息。+ p7 g$ x4 a" F) A
可能你文件打开有问题，记得检测返回值。　　　　　　

sourceFile=fopen("/temp/1.mp3","r");& l' V1 D8 z) _7 }$ C# u
如果打开不成功就会出错。0 r4 g4 X$ W* v- I) x
应该改成
6 ?- h# e; z2 U. G9 W' Y5 W; }+ h  Zif( !(sourceFile=fopen("/temp/1.mp3","r")))2 K1 n, D7 N2 ]9 O6 |* c7 s% ^
    return;9 H/ c1 l' V  i8 w
好一点