1. 错误处理与错误号cat /usr/include/asm-generic/errno-base.h#define?EPERM?? 1?/* Operation not permitted */#define?ENOENT?? 2?/* No such file or directory */#define?ESRCH?? 3?/* No such process */#define?EINTR?? 4?/* Interrupted system call */#define?EIO?? 5?/* I/O error */#define?ENXIO?? 6?/* No such device or address */#define?E2BIG?? 7?/* Argument list too long */#define?ENOEXEC?? 8?/* Exec format error */#define?EBADF?? 9?/* Bad file number */#define?ECHILD??10?/* No child processes */#define?EAGAIN??11?/* Try again */#define?ENOMEM??12?/* Out of memory */#define?EACCES??13?/* Permission denied */#define?EFAULT??14?/* Bad address */#define?ENOTBLK??15?/* Block device required */#define?EBUSY??16?/* Device or resource busy */#define?EEXIST??17?/* File exists */#define?EXDEV??18?/* Cross-device link */#define?ENODEV??19?/* No such device */#define?ENOTDIR??20?/* Not a directory */#define?EISDIR??21?/* Is a directory */#define?EINVAL??22?/* Invalid argument */#define?ENFILE??23?/* File table overflow */#define?EMFILE??24?/* Too many open files */#define?ENOTTY??25?/* Not a typewriter */#define?ETXTBSY??26?/* Text file busy */#define?EFBIG??27?/* File too large */#define?ENOSPC??28?/* No space left on device */#define?ESPIPE??29?/* Illegal seek */#define?EROFS??30?/* Read-only file system */#define?EMLINK??31?/* Too many links */#define?EPIPE??32?/* Broken pipe */#define?EDOM??33?/* Math argument out of domain of func */#define?ERANGE??34?/* Math result not representable */

1.1 用错误常数显示错误信息函数strerror()可以把一个错误常数转换成一个错误提示语句。char *strerror(int errnum);

#include #include #include int main(){?int i;?for(i=1;i<15;i++)?{??printf("Errno:%d ",i);??printf("Message:%s/n",strerror(i));?}}2. 创建与删除目录2.1 创建目录函数mkdir()int mkdir(char *pathname,mode_t mode);pathname?//是一个字符型指针，表示需要创建的目录路径。mode??//表示权限的八进制数字作用：创建目录返回值：创建成功返回整数0，否则返回-1头文件：“sys/types.h”“sys/stat.h”可能返回的错误常数：EPERM：目录中有不合规则的名字EEXIST：参数pathname所指