linux c 文件创建

#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main() {
    int fd = open("example.txt", O_CREAT | O_WRONLY, 0644);
    if (fd == -1) {
        perror("Error opening file");
        return 1;
    }
    close(fd);
    printf("File created successfully
");
    return 0;
}

#include <stdio.h>

int main() {
    FILE *file = fopen("example.txt", "w");
    if (file == NULL) {
        perror("Error opening file");
        return 1;
    }
    fclose(file);
    printf("File created successfully
");
    return 0;
}

#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main() {
    int fd = open("example.txt", O_CREAT | O_EXCL | O_WRONLY, 0644);
    if (fd == -1) {
        if (errno == EEXIST) {
            printf("File already exists
");
        } else {
            perror("Error opening file");
        }
        return 1;
    }
    close(fd);
    printf("File created successfully
");
    return 0;
}