驗證Unix/Linux最深目錄以及獲取檔案路徑名的最大限制程式

源代碼如下：

#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <fcntl.h>#include <sys/stat.h>#defineDEPTH100#defineMYHOME"/home/yaodl"#defineNAME"abcdedfhighkelsmgskdiskcjsieksksjdkslsjdlsls"#defineMAXSIZE8192int main(int argc,char **argv){inti,size;char*path;if(chdir(MYHOME) < 0){fprintf(stderr,"chdir error!\n");exit(-1);}for(i=0;i<DEPTH;i++){if(mkdir(NAME,DIR_MODE) < 0){printf("mkdir failed,i = %d\n",i);exit(-1);}if(chdir(NAME) < 0){printf("chdir failed,i = %d\n",i);exit(-1);}}if(creat("afile",FILE_MODE) < 0){printf("create error!\n");exit(-1);}/* * The deep directory is created,with a file at the leaf. * Now Let's try to obtain its pathname.*/path = (char *)malloc(1024);for(;;){if(getcwd(path,size) != NULL){break();}else{printf("getcwd faied,size = %d",size);size += 100;if(size > MAXSZ){printf("giving up!\n");exit(-1);}if((path = realloc(path,size)) == NULL){printf("realloc error!\n");exit(-1);}}}printf("length = %d\n%s\n",strlen(path),path);exit(0);}