FORK(2) FORK(2) NAME fork - spawn new process SYNOPSIS fork() DESCRIPTION Fork is the only way new processes are created. The new process's core image is a copy of that of the caller of fork. The only distinction is that the value returned in the old (parent) process is the process ID of the new (child) process, while the value returned in the child is 0. Pro- cess ID's range from 1 to 30,000. The process ID is used by wait(2). Files open before the fork are shared, and have a common read-write pointer. In particular, this is the way that standard input and output files are passed and also how pipes are set up. SEE ALSO wait(2), exec(2) DIAGNOSTICS Returns -1 and fails to create a process if: there is inade- quate swap space, the user is not super-user and has too many processes, or the system's process table is full. Only the super-user can take the last process-table slot.