GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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wait(2) |
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wait wait for process to terminate (wait = 7.)
sys wait
(process ID in r0)
(status in r1) wait(status)
int *status; causes its caller to delay until one of its
child processes terminates. If any child has died since the
last return is immediate; if there are no children, return
is immediate with the error bit set (resp. with a value of 1
returned). The normal return yields the process ID of the
terminated child (in r0). In the case of several children
several calls are needed to learn of all the deaths. If no
error is indicated on return, the r1 high byte (resp. the
high byte stored into ) contains the low byte of the child
process r0 (resp. the argument of ) when it terminated. The
r1 (resp. ) low byte contains the termination status of the
process. See signal (II) for a list of termination statuses
(signals); 0 status indicates normal termination. A special
status (0177) is returned for a stopped process which has
not terminated and can be restarted. See ptrace (II). If the
0200 bit of the termination status is set, a core image of
the process was produced by the system. If the parent
process terminates without waiting on its children, the
initialization process (process ID = 1) inherits the
children. exit (II), fork (II), signal (II) The error bit
(c-bit) is set if there are no children not previously
waited for. From C, a returned value of 1 indicates an
error.
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wait(2) | |