在linux中,我想用C语言将err_ret("can't read directory %s", pathname)输出的error message 重新定义到一个txt文件中
我尝试使用fopen建立新的txt 文件然后直接输入,但是并不行。
同时在进行gcc的时候会提示 error: invalid use of void expression
fprintf(fp, err_ret("can't read directory %s", pathname));
请问该如何修改。谢谢
【注,不是在shell中用>>进行redirect】
static int
myfunc(const char *pathname, const struct stat *statptr, int type)
{
FILE *fp = fopen("task14error.txt","w");
switch (type) {
case FTW_F:
switch (statptr->st_mode & S_IFMT) {
case S_IFREG: nreg++; break;
case S_IFBLK: nblk++; break;
case S_IFCHR: nchr++; break;
case S_IFIFO: nfifo++; break;
case S_IFLNK: nslink++; break;
case S_IFSOCK: nsock++; break;
case S_IFDIR: /* directories should have type = FTW_D */
err_dump("for S_IFDIR for %s", pathname);
}
break;
case FTW_D:
ndir++;
break;
case FTW_DNR:
ndnr++;
fprintf(fp, err_ret("can't read directory %s", pathname));
break;
case FTW_NS:
err_ret("stat error for %s", pathname);
break;
default:
err_dump("unknown type %d for pathname %s", type, pathname);
}
fclose(fp);
return(0);
}