Index
System Calls
Example of Standard C Library
Types of System Calls:
1)Process control
2)File management
3)Device management
4)Information maintenance
5)Communications
Quiz
End |
| System Calls |
| process D |
| free memory |
| process C |
| interpreter |
| process B |
| kernel |
- FreeBSD (derived from Berkeley UNIX) is an example of a multitasking system. When a user logs on to the system, the shell of the user's choice is run.
- This shell is similar to the MS-DOS shell in that it accepts commands and executes programs that the user requests. However, since FreeBSD is a multitasking system, the command interpreter may continue running while another program is executed.
- To start a new process, the shell executes a fork() system call. Then, the selected program is loaded into memory via an exec() system call, and the program is executed.
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