Open System Services System Calls Reference Manual (G06.25+, H06.03+)

Files signal(4)
Discard signal Urgent condition on I/O channelSIGURG 5
Terminate process User-defined signal 1SIGUSR1 16
Terminate process User-defined signal 2SIGUSR2 17
Discard signal Terminal device window size
changed
SIGWINCH 12
For details of the process loop timer, see the SETLOOPTIMER procedure in the Guardian Pro-
cedure Calls Reference Manual.
Note: The process terminates and, where possible, a saveabend (core) file is created on genera-
tion of any signal if both of the following conditions are true:
• The signal was generated as a result of something other than the kill() or raise()
function.
• Either the signal is blocked or ignored, or the process is in operating system code
when the signal is generated.
The _POSIX_JOB_CONTROL symbolic constant is always defined. Hence, the job control sig-
nals are all supported: SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN, and
SIGTTOU.
Default Action
The default action for a signal occurs when the signal is not blocked and one of the following is
true:
• No signal-catching function is installed for that signal.
• A signal-catching function is installed for the signal, but the SIG_DFL action is
specified.
The table under The Signals, earlier, indicates a default action for each signal. The default
actions have the following meanings:
Terminate process
Terminate the receiving process with all the consequences described for the
_exit() function.
Terminate with saveabend
Terminate the receiving process with all the consequences described for the
_exit() function. Create a memory image file (saveabend file) in the current
directory of the receiving process if the following conditions are met:
• The effective user ID and the real user ID of the receiving process are
equal.
• A regular file named ZZSAnnnn (the saveabend file) can be created in
the current directory. The file will have the following properties:
— The access permission code 0666 (0x1B6), modified by the
filemode creation mask (see the umask(2) reference page)
— A file owner ID that is the same as the effective user ID of the
receiving process
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