I.Linux C 创建目录函数 mkdir 的mode设置问题

函数原型：

#i nc lude <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 pe rm ission bit for the group owner of the  file . U su ally 040.
S_IWGRP
Write permission bit for the group owner of the file. Usually 020.
S_IXGRP
Exe cut e 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  ex ecute 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];  
  s tr cp y(DirName,   sPathName);  
  int   i,len   =   strlen(DirName);  
  if(DirName[len-1]!='/')  
  str cat (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。

#define SRCPATH "s rcp ath/"
#define DSTPATH "dstpath/"

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

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 = rea dd ir(dir)) != NULL)
{ 
if(str cmp (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  id 1;
int ret;
ret = pthread_create(&id1, NULL, (void*)movefile, NULL);
return ret;
}