Linux C 創建目錄函數mkdir相關

I.Linux C 創建目錄函數mkdir的mode設置問題

函數原型：

#include <sys/stat.h>

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

參數：

path是目錄名

mode是目錄權限

返回值：

返回0 表示成功， 返回 -1表示錯誤，並且會設置errno值。

mode模式位：

mode 表示新目錄的權限，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);

這樣就創建了一個newdir目錄，權限通過ls -al 查看爲

drwxr-xr-x

跟用linux命令mkdir創建的目錄權限位一致。


II. linux下C語言創建多級目錄

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 編程：創建一個線程，監視某個目錄，一旦目錄裏出現新的文件，就將文件轉移到指定的目錄裏去。
/*
頭文件
*/
#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;
}
//如果這個目錄裏 還有目錄，可以在這加判斷
//這裏假設初始爲空目錄
strcat(filename1,dt->d_name);
strcat(filename2,dt->d_name);
//如果進程資源較少可以直接用linux系統命令

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;
}