C语言解析软链接路径，获取真实路径
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>int resolve_symlink(const char *symlink_path, char *resolved_path, size_t size) {if (realpath(symlink_path, resolved_path) == NULL) {perror("realpath");return -1;}return 0;
}int main() {const char *symlink_path = "/data/wwwroot/TeamSpiritnode/1235.php";char resolved_path[PATH_MAX];if (resolve_symlink(symlink_path, resolved_path, sizeof(resolved_path)) == 0) {printf("Resolved path: %s\n", resolved_path);} else {printf("Failed to resolve symlink: %s\n", symlink_path);}return 0;
}
gcc -o test111 test1111.c
./test111
值得注意：readlink只能获取单个的软链接，不能获取嵌套的
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>int resolve_symlink(const char *symlink_path, char *resolved_path, size_t size) {ssize_t len = readlink(symlink_path, resolved_path, size - 1);if (len == -1) {perror("readlink");return -1;}resolved_path[len] = '\0'; // Null-terminate the stringreturn 0;
}int main() {const char *symlink_path = "/data/wwwroot/111/111.php";char resolved_path[PATH_MAX];if (resolve_symlink(symlink_path, resolved_path, sizeof(resolved_path)) == 0) {printf("Resolved path: %s\n", resolved_path);} else {printf("Failed to resolve symlink: %s\n", symlink_path);}return 0;
}内核态实现，只能4.17.x版本之前可用
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/slab.h>static int resolve_symlink(const char *path, char *resolved_path, size_t size) {struct path kern_path;char *tmp;int err;err = kern_path(path, LOOKUP_FOLLOW, &kern_path);if (err) {printk(KERN_ERR "Failed to resolve path: %s\n", path);return err;}tmp = dentry_path_raw(kern_path.dentry, resolved_path, size);if (IS_ERR(tmp)) {printk(KERN_ERR "Failed to get real path: %s\n", path);path_put(&kern_path);return PTR_ERR(tmp);}path_put(&kern_path);return 0;
}static int __init my_module_init(void) {char resolved_path[PATH_MAX];const char *symlink_path = "/data/wwwroot/111/111.php";if (resolve_symlink(symlink_path, resolved_path, sizeof(resolved_path)) == 0) {printk(KERN_INFO "Resolved path: %s\n", resolved_path);} else {printk(KERN_ERR "Failed to resolve symlink: %s\n", symlink_path);}return 0;
}static void __exit my_module_exit(void) {printk(KERN_INFO "Module exiting\n");
}module_init(my_module_init);
module_exit(my_module_exit);MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A module to resolve symlink paths");
