This section contains information about the signals that are supported by z/OS UNIX. These signals are mapped by the BPXYSIGH mapping macro; see BPXYSIGH — Signal constants. The following table lists the signals and their default actions:
| Constant | Value | Default action | Description |
|---|---|---|---|
| SIGABND# | 18 | 1 | Abend |
| SIGABRT# | 3 | 1 | Abnormal termination |
| SIGALRM# | 14 | 1 | Timeout |
| SIGBUS# | 10 | 1 | Bus error |
| SIGCHLD# | 20 | 2 | Child process terminated or stopped |
| SIGCONT# | 19 | 4 | Continue if stopped |
| SIGDANGER | 33 | 1 | Termination |
| SIGDUMP# | 39 | 2 | The system takes a SYSMDUMP and writes it to an MVS™ data set or a z/OS UNIX file. The _BPXK_MDUMP environment variable must be set to the name of the data set or file. This signal cannot be caught. |
| SIGFPE# | 8 | 1 | Erroneous arithmetic operation, such as division by zero or an operation resulting in overflow |
| SIGHUP# | 1 | 1 | Hangup detected on controlling terminal |
| SIGILL# | 4 | 1 | Detection of an incorrect hardware instruction |
| SIGINT# | 2 | 1 | Interactive attention |
| SIGIO# | 23 | 2 | Completion of input or output |
| SIGIOER# | 27 | 2 | I/O error |
| SIGKILL# | 9 | 1 | Termination (cannot be caught or ignored). Can result if abend not caught or handled and terminating status not set; CPU time exceeded and SIGXCPU# caught or ignored; or sigkill shell command sent. |
| SIGNULL# | 0 | 2 | Null; no signal sent (cannot be caught or ignored) |
| SIGPIPE# | 13 | 1 | Write on a pipe with no readers |
| SIGPOLL# | 5 | 1 | Pollable event |
| SIGPROF# | 32 | 1 | Profiling timer expired |
| SIGQUIT# | 24 | 1 | Interactive termination |
| SIGSEGV# | 11 | 1 | Detection of an incorrect memory reference |
| SIGSTOP# | 7 | 3 | Stop (cannot be caught or ignored) |
| SIGSYS# | 12 | 1 | Bad system call |
| SIGTERM# | 15 | 1 | Termination |
| SIGTHCONT# | 35 | 1 | Thread continue (cannot be caught or blocked or ignored) |
| SIGTHSTOP# | 34 | 1 | Thread stop (cannot be caught or blocked or ignored) |
 SIGTMOUT# |
40 |
1 |
Terminates a process waiting for terminal activity. Cannot
be caught or ignored. Is reserved for z/OS® use. It
cannot be sent by an application program. |
| SIGTRACE# | 37 | 2 | Toggles the user syscall trace setting ON or OFF. |
| SIGTSTP# | 25 | 3 | Interactive stop |
| SIGTTIN# | 21 | 3 | Read from a control terminal attempted by a member of a background |
| SIGTTOU# | 22 | 3 | Write from a control terminal attempted by a member of a background process group |
| SIGTRAP# | 26 | 1 | Trap used by the ptrace call |
| SIGURG# | 6 | 2 | High bandwidth data is available at a socket |
| SIGUSR1# | 16 | 1 | Reserved as application-defined signal 1 |
| SIGUSR2# | 17 | 1 | Reserved as application-defined signal 2 process group |
| SIGVTALRM# | 31 | 1 | Virtual timer expired |
| SIGXCPU# | 29 | 1 | CPU time limit exceeded |
| SIGXFSZ# | 30 | 1 | File size limit exceeded |
| SIGWINCH# | 28 | 2 | Change size of window |
The default actions are:
- Abnormal termination.
- Ignore the signal.
- Stop the process.
- Continue if it is currently stopped; otherwise, ignore the signal.