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Diffstat (limited to 'static/unix-v10/man2/wait.2')
| -rw-r--r-- | static/unix-v10/man2/wait.2 | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/static/unix-v10/man2/wait.2 b/static/unix-v10/man2/wait.2 new file mode 100644 index 00000000..1c76ef1a --- /dev/null +++ b/static/unix-v10/man2/wait.2 @@ -0,0 +1,59 @@ +.pa 1 +.he 'WAIT (II)'9/4/72'WAIT (II)' +.ti 0 +NAME wait -- wait for process to die +.sp +.ti 0 +SYNOPSIS sys wait / wait = 7. +.br +(process ID in r0) +.br +(termination status/user status in r1) +.sp +.ti 0 +DESCRIPTION wait____ +causes its caller to delay until one of its child +processes terminates. +If any child has died since the last wait____, return is immediate; +if there are no children, return is immediate with +the error bit set. +In the case of several children several wait____s are needed +to learn of all the deaths. +.sp +If the error bit is not set on return, +the r1 high byte contains the low byte of the +child process r0 when it terminated. +The r1 low byte contains the termination status +of the process from the following list: +.sp + 0 exit + 1 bus error + 2 illegal instruction + 3 trace trap + 4 IOT trap + 5 power fail trap + 6 EMT trap + 7 bad system call + 8 PIR interrupt + 9 floating point exception + 10 memory violation + 11 quit + 12 interrupt + 13 kill (see kill(II)) + 14 User I/O (not currently possible) + +16 core image produced +.sp +.ti 0 +SEE ALSO exit(II), fork(II) +.sp +.ti 0 +DIAGNOSTICS error bit +(c-bit) on if no children not previously waited for. +.sp +.ti 0 +BUGS A child +which dies, but is never +waited for consumes +a slot in the process table. +When this table is full, +the system is effectively hung. |