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ulimit(2) [hpux man page]

ulimit(2)							System Calls Manual							 ulimit(2)

NAME
ulimit() - get and set user limits SYNOPSIS
Remarks The ANSI C "" construct denotes a variable length argument list whose optional [or required] members are given in the associated comment DESCRIPTION
provides for control over process limits. Available values for cmd are: Get the file size limit of the process. The limit is in units of 512-byte blocks and is inherited by child processes. Files of any size can be read. The optional second argument is not used. Set the file size limit of the process to the value of the optional second argument which is taken as a long. Any process can decrease this limit, but only a process with the privilege can increase the limit. Note that the limit must be specified in units of 512-byte blocks. Get the maximum possible break value (see brk(2)). Depending on system resources such as swap space, this maximum might not be attainable at a given time. The optional second argument is not used. Security Restrictions Some or all of the actions associated with this system call require the privilege. Processes owned by the superuser have this privilege. Processes owned by other users may have this privilege, depending on system configuration. See privileges(5) for more information about privileged access on systems that support fine-grained privileges. RETURN VALUE
Upon successful completion, a non-negative value is returned. Errors return a -1, with set to indicate the error. ERRORS
fails if one or more of the following conditions is true. cmd is not in the correct range. fails and the limit is unchanged if a process without the privilege attempts to increase its file size limit. SEE ALSO
brk(2), write(2), privileges(5). STANDARDS CONFORMANCE
ulimit(2)

Check Out this Related Man Page

nice(2) 							System Calls Manual							   nice(2)

NAME
nice - change priority of a process SYNOPSIS
DESCRIPTION
adds the value of priority_change to the nice value of the calling process. A process's is a positive number for which a more positive value results in lower CPU priority. A maximum nice value of 39 and a minimum nice value of 0 are imposed by the system. Requests for values above or below these limits result in the nice value being set to the corresponding limit. If the calling process contains more than one thread or lightweight process (i.e., the process is multi-threaded) this function shall apply to all threads or lightweight processes in the calling process. Security Restrictions Some or all of the actions associated with this system call are subject to compartmental restrictions. See compartments(5) for more infor- mation about compartmentalization on systems that support that feature. Compartmental restrictions can be overridden if the process pos- sesses the privilege (COMMALLOWED). Processes owned by the superuser may not have this privilege. Processes owned by any user may have this privilege, depending on system configuration. Some or all of the actions associated with this system call require the (OWNER) and/or the (LIMIT) privileges. Processes owned by the superuser will have these privileges. Processes owned by other users may have privilege(s), depending on system configuration. See privi- leges(5) for more information about privileged access on systems that support fine-grained privileges. RETURN VALUE
Upon successful completion, returns the new nice value minus 20. Otherwise, a value of -1 is returned and is set to indicate the error. Note that assumes a user process priority value of 20. If a user having appropriate privileges has changed the user process priority value to something less than 20, certain values for priority_change can cause to return -1, which is indistinguishable from an error return. ERRORS
[EPERM] fails and does not change the nice value if priority_change is negative or greater than 40, and the effective user ID of the calling process is not a user having appropriate privileges. SEE ALSO
nice(1), renice(1M), exec(2), privileges(5). STANDARDS CONFORMANCE
nice(2)

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