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Annotation of researchv10dc/dist/man/v3/man2/wait.2, revision 1.1

1.1     ! root        1: .pa 1
        !             2: .he 'WAIT (II)'9/4/72'WAIT (II)'
        !             3: .ti 0
        !             4: NAME           wait  --  wait for process to die
        !             5: .sp
        !             6: .ti 0
        !             7: SYNOPSIS       sys wait  / wait = 7.
        !             8: .br
        !             9: (process ID in r0)
        !            10: .br
        !            11: (termination status/user status in r1)
        !            12: .sp
        !            13: .ti 0
        !            14: DESCRIPTION    wait____
        !            15: causes its caller to delay until one of its child
        !            16: processes terminates.
        !            17: If any child has died since the last wait____, return is immediate;
        !            18: if there are no children, return is immediate with
        !            19: the error bit set.
        !            20: In the case of several children several wait____s are needed
        !            21: to learn of all the deaths.
        !            22: .sp
        !            23: If the error bit is not set on return,
        !            24: the r1 high byte contains the low byte of the
        !            25: child process r0 when it terminated.
        !            26: The r1 low byte contains the termination status
        !            27: of the process from the following list:
        !            28: .sp
        !            29:    0   exit
        !            30:    1   bus error
        !            31:    2   illegal instruction
        !            32:    3   trace trap
        !            33:    4   IOT trap
        !            34:    5   power fail trap
        !            35:    6   EMT trap
        !            36:    7   bad system call
        !            37:    8   PIR interrupt
        !            38:    9   floating point exception
        !            39:   10   memory violation
        !            40:   11   quit
        !            41:   12   interrupt
        !            42:   13   kill (see kill(II))
        !            43:   14   User I/O (not currently possible)
        !            44:  +16   core image produced
        !            45: .sp
        !            46: .ti 0
        !            47: SEE ALSO       exit(II), fork(II)
        !            48: .sp
        !            49: .ti 0
        !            50: DIAGNOSTICS    error bit
        !            51: (c-bit) on if no children not previously waited for.
        !            52: .sp
        !            53: .ti 0
        !            54: BUGS           A child
        !            55: which dies, but is never
        !            56: waited for consumes
        !            57: a slot in the process table.
        !            58: When this table is full,
        !            59: the system is effectively hung.

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