请教一个错误:void value not ignored as it ought to be

[benjum]

用GCC编译出现如下错误:
test9.c:17: void value not ignored as it ought to be

程序是关于流的IO操作,代码如下:
........
FILE *stream;
if((stream=fopen("test","r"))==(FILE*)0)
{
fprintf(stderr,"error opening file.\n");
exit(1);
}
if((setlinebuf(stream))!=0) //出错误的行
{
fprintf(stderr,"error setlinebuffer.\n");
exit(1)
}
..........

出错的意思好像是说setlinebuf不该加参数stream?弄不明白.....
请各位指点迷津!!

[yjf7888]

setlinebuf好像没有返回值

[sharkhuang]

对！没有返回值。返回类型是void