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1992-03-24
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Pwait3(2) Oct. 1, 1991 Pwait3(2)
NAME
Pwait, Pwait3 - get exit status of children
SYNOPSIS
LONG Pwait();
LONG Pwait3( WORD flag, LONG *rusage );
DESCRIPTION
Pwait3 attempts to determine the exit code for any stopped
children or children that have terminated. If bit 1 of flag
is set, then children that are stopped due to job control
are reported; otherwise only children that have actually
terminated are reported. A stopped process will be reported
at most once (unless it is re-started and stopped again);
similarly a terminated process will be reported only once.
If the process does have children, but none are currently
stopped or terminated and not yet waited for, then the
behavior of Pwait3 is controlled by bit 0 of flag. If it is
clear, the function will wait until some child is stopped or
terminates; if it is set, the function will return immedi-
ately.
The rusage parameter, if non-zero, should point to two long
words, into which information about the child's CPU time
usage is placed, as follows:
rusage[0]: milliseconds spent by child in user space
rusage[1]: milliseconds spent by child in kernel space
The Pwait() system call is equivalent to Pwait3(2, (LONG
*)0), and is provided both for convenience and for backward
compatibility.
RETURNS
If a child process is found, its process id is placed in the
upper 16 bits of the 32 bit value returned, and its exit
status (as passed to Pterm or Ptermres, as determined impli-
citly by Pterm0, or as determined by the type of signal that
stopped or killed the process) is placed in the lower 16
bits. If the process was stopped or terminated by signal n,
then its exit status will be ( n<< 8 ) | x. where x is 127
if the process was stopped and 0 if the process was ter-
minated.
0 if bit 0 of flag is set and the Pwait3 system call would
have otherwise blocked waiting for a child to exit or stop.
EFILNF if no unwaited for children exist
SEE ALSO
Pexec(2), Pterm(2), Pterm0(2), Ptermres(2)
Version 0.9 Last change: MiNT Programmer's Manual 1
Pwait3(2) Oct. 1, 1991 Pwait3(2)
BUGS
It is not possible to wait for a specific child process.
Version 0.9 Last change: MiNT Programmer's Manual 2