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Annotation of researchv10dc/dist/man/v3/man2/wait.2, revision 1.1.1.1

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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