Linux 在 C 中创建一个新目录
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Creating a new directory in C
提问by Jeegar Patel
I want to write a program that checks for the existence of a directory; if that directory does not exist then it creates the directory and a log file inside of it, but if the directory already exists, then it just creates a new log file in that folder.
我想编写一个程序来检查目录是否存在；如果该目录不存在，则它会在其中创建目录和日志文件，但如果该目录已存在，则它只会在该文件夹中创建一个新的日志文件。
How would I do this in C with Linux?
我将如何在 Linux 中用 C 语言做到这一点？
采纳答案by Arnaud Le Blanc
Look at statfor checking if the directory exists,
查看stat目录是否存在，
And mkdir, to create a directory.
并且mkdir，创建一个目录。
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
struct stat st = {0};
if (stat("/some/directory", &st) == -1) {
mkdir("/some/directory", 0700);
}
You can see the manual of these functions with the man 2 statand man 2 mkdircommands.
您可以使用man 2 stat和man 2 mkdir命令查看这些功能的手册。
回答by Paul R
You can use mkdir:
您可以使用 mkdir：
#include <sys/stat.h>
#include <sys/types.h>
int result = mkdir("/home/me/test.txt", 0777);
回答by Jens Harms
I want to write a program that (...) creates the directory and a (...) file inside of it
我想编写一个程序，该程序 (...) 在其中创建目录和一个 (...) 文件
because this is a very common question, here is the code to create multiple levels of directories and than call fopen. I'm using a gnu extension to print the error message with printf.
因为这是一个非常常见的问题，这里是创建多级目录而不是调用 fopen 的代码。我正在使用 gnu 扩展来打印带有 printf 的错误消息。
void rek_mkdir(char *path) {
char *sep = strrchr(path, '/');
if(sep != NULL) {
*sep = 0;
rek_mkdir(path);
*sep = '/';
}
if(mkdir(path, 0777) && errno != EEXIST)
printf("error while trying to create '%s'\n%m\n", path);
}
FILE *fopen_mkdir(char *path, char *mode) {
char *sep = strrchr(path, '/');
if(sep) {
char *path0 = strdup(path);
path0[ sep - path ] = 0;
rek_mkdir(path0);
free(path0);
}
return fopen(path,mode);
}
