GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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fork(2) |
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fork spawn new process (fork = 2.)
sys fork
(new process return)
(old process return) fork( ) is the only way new
processes are created. The new process’s core image is
a copy of that of the caller of The only distinction is the
return location and the fact that r0 in the old (parent)
process contains the process ID of the new (child) process.
This process ID is used by The two returning processes share
all open files that existed before the call. In particular,
this is the way that standard input and output files are
passed and also how pipes are set up. From C, the child
process receives a 0 return, and the parent receives a
non-zero number which is the process ID of the child; a
return of 1 indicates inability to create a new process.
wait (II), exec (II) The error bit (c-bit) is set in the old
process if a new process could not be created because of
lack of process space. From C, a return of 1 (not just
negative) indicates an error.
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fork(2) | |