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;
}
