I.Linux C 创建目录函数mkdir的mode设置问题 

函数原型： 

#include <sys/stat.h> 

int mkdir(const char *path, mode_t mode); 

参数： 

path是目录名 

mode是目录权限 

返回值： 

返回0 表示成功， 返回 -1表示错误，并且会设置errno值。 

mode模式位： 

mode 表示新目录的权限，可以取以下值： 

S_IRUSR 
S_IREAD 

S_IWUSR 
S_IWRITE 
S_IXUSR 
S_IEXEC 
S_IRWXU 
This is equivalent to (S_IRUSR | S_IWUSR | S_IXUSR). 
S_IRGRP 
Read permission bit for the group owner of the file. Usually 040. 
S_IWGRP 
Write permission bit for the group owner of the file. Usually 020. 
S_IXGRP 
Execute or search permission bit for the group owner of the file. Usually 010. 
S_IRWXG 
This is equivalent to (S_IRGRP | S_IWGRP | S_IXGRP). 
S_IROTH 
Read permission bit for other users. Usually 04. 
S_IWOTH 
Write permission bit for other users. Usually 02. 
S_IXOTH 
Execute or search permission bit for other users. Usually 01. 
S_IRWXO 
This is equivalent to (S_IROTH | S_IWOTH | S_IXOTH). 
S_ISUID 
This is the set-user-ID on execute bit, usually 04000. See How Change Persona. 
S_ISGID 
This is the set-group-ID on execute bit, usually 02000. See How Change Persona. 
S_ISVTX 
This is the sticky bit, usually 01000. 

例子： 

#include <sys/types.h> #include <sys/stat.h> 
int status; 

status = mkdir("/home/newdir", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); 

这样就创建了一个newdir目录，权限通过ls -al 查看为 

drwxr-xr-x 

跟用linux命令mkdir创建的目录权限位一致。 



II. linux下C语言创建多级目录 

int   CreateDir(const   char   *sPathName)  
  {  
  char   DirName[256];  
  strcpy(DirName,   sPathName);  
  int   i,len   =   strlen(DirName);  
  if(DirName[len-1]!='/')  
  strcat(DirName,   "/");  
   
  len   =   strlen(DirName);  
   
  for(i=1;   i<len;   i++)  
  {  
  if(DirName[i]=='/')  
  {  
  DirName[i]   =   0;  
  if(   access(DirName,   NULL)!=0   )  
  {  
      if(mkdir(DirName,   0755)==-1)  
      {   
                      perror("mkdir   error");   
                      return   -1;   
      }  
  }  
  DirName[i]   =   '/';  
  }  
  }  
   
  return   0;  
  } 

III.linux c 编程：创建一个线程，监视某个目录，一旦目录里出现新的文件，就将文件转移到指定的目录里去。 
/* 
头文件 
*/ 
#define SRCPATH "srcpath/" 
#define DSTPATH "dstpath/" 

int movefile() 
{
DIR *dir; 
struct dirent *dt; 
FILE *fp1,*fp2; 
char filename1[256],filename2[256]; 
char buf[1024]; 
int readsize,writesize; 

if((dir = opendir(SRCPATH)) == NULL) 
{ 
printf("opendir %s error\n",SRCPATH); 
return -1; 
} 
memset(filename1,0,sizeof(filename1)); 
strcpy(filename1,SRCPATH); 
memset(filename2,0,sizeof(filename2)); 
strcpy(filename2,DSTPATH); 
while(1) 
{ 
while((dt = readdir(dir)) != NULL) 
{ 
if(strcmp(dt->d_name,".")==0||strcmp(dt->d_name,"..")==0) 
{ 
continue; 
} 
//如果这个目录里 还有目录，可以在这加判断 
//这里假设初始为空目录 
strcat(filename1,dt->d_name); 
strcat(filename2,dt->d_name); 
//如果进程资源较少可以直接用linux系统命令 

fp1 = fopen(filename1,"rb"); 
if(fp1==NULL) 
{ 
printf("open %s failed /n",filename1); 
return -1; 
}

fp2 = fopen(filename2,"wb"); 
if(fp2==NULL) 
{ 
printf("open %s failed /n",filename2); 
fclose(fp1); 
return -1; 
} 

while((readsize = fread(buf,sizeof(buf),1,fp1))>0) 
{ 
//total += readsize; 
memset(buf,0,sizeof(buf)); 
writesize = fwrite(buf,sizeof(buf),1,fp2); 
if(writesize!==readsize) 
{ 
printf("write error"); 
return -2; 
fclose(fp1); 
fclose(fp2); 
}
} 
fclose(fp1); 
fclose(fp2); 
rmdir(filename2); 
} 
} 
}

int main(int argc,char **argv) 
{ 
pthread_t id1; 
int ret; 
ret = pthread_create(&id1, NULL, (void*)movefile, NULL); 
return ret; 
}