| abort | stops the program |
| assert | stops the program if an expression isn't true |
| atexit | sets a function to be called when the program exits |
| bsearch | perform a binary search |
| exit | stop the program |
| getenv | get environnment information about a variable |
| longjmp | start execution at a certain point in the program |
| putenv | add/modify the environmental settings |
| qsort | perform a quicksort |
| raise | send a signal to the program |
| rand | returns a pseudorandom number |
| 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 |