如何在C中查找保存文件的进程

#include <stdio.h>
#include <dirent.h>
#include <string.h>

void findProcessWithFile(const char* filename) {
    DIR* dir = opendir("/proc");
    struct dirent* entry;

    while ((entry = readdir(dir)) != NULL) {
        if (entry->d_type == DT_DIR) {
            char path[256];
            snprintf(path, sizeof(path), "/proc/%s/fd", entry->d_name);

            DIR* fdDir = opendir(path);
            struct dirent* fdEntry;

            while ((fdEntry = readdir(fdDir)) != NULL) {
                if (strcmp(fdEntry->d_name, ".") != 0 && strcmp(fdEntry->d_name, "..") != 0) {
                    char filePath[256];
                    snprintf(filePath, sizeof(filePath), "%s/%s", path, fdEntry->d_name);

                    char targetPath[256];
                    ssize_t len = readlink(filePath, targetPath, sizeof(targetPath) - 1);
                    if (len != -1) {
                        targetPath[len] = '\0';
                        if (strcmp(targetPath, filename) == 0) {
                            printf("Process ID: %s\n", entry->d_name);
                            // 可以在这里记录进程信息或执行其他操作
                        }
                    }
                }
            }

            closedir(fdDir);
        }
    }

    closedir(dir);
}

int main() {
    const char* filename = "/path/to/file";
    findProcessWithFile(filename);

    return 0;
}