To signal a batch job is to send a signal to the session leader of the batch
job. A batch job is signaled by sending a request to the batch server that
manages the batch job. The qsig utility is a user-accessible batch
client that requests the signaling of a batch job.
The qsig utility shall signal those batch jobs for which a batch
job_identifier is presented to the utility. The qsig utility
shall not signal any batch jobs whose batch job_identifiers are not
presented to the utility.
The qsig utility shall signal batch jobs in the order in which the
corresponding batch job_identifiers are presented to the utility. If
the qsig utility fails to process a batch job_identifier
successfully, the utility shall proceed to process the remaining batch
job_identifiers, if any.
The qsig utility shall signal batch jobs by sending a SignalJob Request to the batch server that manages the batch job.
For each successfully processed batch job_identifier, the qsig
utility shall have received a completion reply to each Signal Job
Request sent to a batch server at the time the utility exits.
The qsig utility shall conform to the Base Definitions volume of
IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported by the implementation:
Define the signal to be sent to the batch job.
The qsig utility shall accept a signal option-argument that is
either a symbolic signal name or an unsigned integer signal number (see the
POSIX.1-1990 standard, Section 220.127.116.11). The qsig utility shall accept
signal names for which the SIG prefix has been omitted.
If the signal option-argument is a signal name, the qsig utility
shall send that name.
If the signal option-argument is a number, the qsig utility shall
send the signal value represented by the number.
If the -s option is not presented to the qsig utility, the utility
shall send the signal SIGTERM to each signaled batch job.
The following environment variables shall affect the execution of qsig:
Provide a default value for the internationalization
variables that are unset or null. (See the Base Definitions volume of
IEEE Std 1003.1-2001, Section 8.2, Internationalization
Variables for the precedence of internationalization variables used to
determine the values of locale categories.)
If set to a non-empty string value, override the values of
all the other internationalization variables.
Determine the locale for the interpretation of sequences of
bytes of text data as characters (for example, single-byte as opposed to
multi-byte characters in arguments).
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to standard error.
In addition to the default behavior, the qsig utility shall not be
required to write a diagnostic message to standard error when the error reply
received from a batch server indicates that the batch job_identifier
does not exist on the server. Whether or not the qsig utility waits to
output the diagnostic message while attempting to locate the batch job on
other servers is implementation-defined.
The following sections are informative.
The qsig utility allows users to signal batch jobs.
A user may be unable to signal a batch job with the kill utility of the
operating system for a number of reasons. First, the process ID of the batch
job may be unknown to the user. Second, the processes of the batch job may be
on a remote node. However, by virtue of communication between batch nodes, the
qsig utility can arrange for the signaling of a process.
Because a batch job that is not running cannot be signaled, and because the
signal may not terminate the batch job, the qsig utility is not a
substitute for the qdel utility.
The options of the qsig utility allow the user to specify the signal that
is to be sent to the batch job.
The -s option allows users to specify a signal by name or by number, and
thus override the default signal. The POSIX.1-1990 standard defines signals by
both name and number.
The qsig utility is a new utility, vis-a-vis existing practice; it
has been defined in this volume of IEEE Std 1003.1-2001 in
response to user-perceived shortcomings in existing practice.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html