z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

are given. If the -h flag is given, the hard limits are used instead of the current
limits. The hard limits impose a ceiling on the values of the current limits. All hard
limits can be raised only by a process which has superuser authority but a user
may lower or raise the current limits within the legal range. If a user attempts to
make a soft limit ″unlimited″, and their effective UID is not 0, then limit (or unlimit)
will set the soft limit to the current hard limit value.
Resources currently include:
addressspace
The maximum address space size for the process, measured in kilobytes. If
the limit is exceeded, malloc() and mmap() functions will fail. Also,
automatic stack growth will fail. An attempt to set the address space size
limit lower than the current usage or higher than the existing hard limit will
fail.
coredumpsize
The size of the largest core dump file that will be created. A value of 0
(zero) prevents file creation. Dump file creation will stop at this limit.
cputime
The maximum amount of CPU time, in seconds, to be used by each
process. If the limit is exceeded, a SIGXCPU signal is sent to the process
and the process is granted a small CPU time extension to allow for signal
generation and delivery. If the extension is used up, the process is
terminated with a SIGKILL signal. An attempt to set the CPU limit lower
than that already used will fail.
datasize
The data size limit is the maximum size of the break value for the process,
in units of 1024 bytes. This resource always has unlimited hard and soft
limits.
descriptors
The maximum number of open file descriptors allowed for the process. This
number is one greater than the maximum value that may be assigned to a
newly created descriptor. Any function that attempts to create a new file
descriptor beyond the limit will fail. An attempt to set the open file
descriptors limit lower than that already used will fail.
filesize
tcsh: limit
The largest single file which can be created by a process. A value of 0
(zero) prevents file creation. If the size is exceeded, a SIGXFSZ signal is
sent to the process. If the process is blocking, catching, or ignoring
SIGXFSZ, continued attempts to increase the size of a file beyond the limit
will fail
memlimit
The amount of storage, in megabytes, above the 2 gigabyte bar that a
process is allowed to have allocated and unhidden at any given time. An
attempt to set the storage size limit lower than the current usage or higher
than the existing hard limit will fail.
stacksize
The maximum size of the automatically-extended stack region for a
process. The stack is a per-thread resource that has unlimited hard and soft
limits.
maximum-use may be given as a (floating point or integer) number followed by a
scale factor. For cputime the default scaling is seconds, while m for minutes or h for
Chapter 2. Shell command descriptions 683