| abort | 終止程式 |
| assert | 若運算式的值非真，則終止程式 |
| atexit | 設定程式終止時要呼叫的函式 |
| bsearch | 執行二元搜尋 |
| exit | 終上程式 |
| getenv | 取得環境變數 |
| longjmp | start execution at a certain point in the program |
| putenv | add/modify the environmental settings |
| qsort | 執行快速排序 |
| raise | send a signal to the program |
| rand | 傳回一個偽亂數 |
| setjmp | set execution to start at a certain point |
| signal | register a function as a signal handler |
| srand | initialize the random number generator |
| system | have the default command interpreter execute a command |
| va_arg | use variable length parameter lists |