linux+open写模式

int open(const char *pathname, int flags);
int open(const char *pathname, int flags, mode_t mode);

#include <fcntl.h> // For open function
#include <unistd.h> // For write and close functions
#include <string.h> // For strlen function

int main() {
    const char *filename = "example.txt";
    const char *data = "Hello, World!\n";

    // Open the file with O_WRONLY | O_CREAT | O_TRUNC flags
    int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);

    if (fd == -1) {
        // Error handling
        perror("open");
        return 1;
    }

    // Write data to the file
    ssize_t bytes_written = write(fd, data, strlen(data));

    if (bytes_written == -1) {
        // Error handling
        perror("write");
        close(fd);
        return 1;
    }

    // Close the file descriptor
    close(fd);

    return 0;
}