ULIMIT(3) BSD Library Functions Manual ULIMIT(3)NAME
ulimit -- get and set process limits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ulimit.h>
long
ulimit(int cmd, ...);
DESCRIPTION
The ulimit() function will get and set process limits. Currently, this is limited to the maximum file size. The cmd argument is one of the
following:
UL_GETFSIZE will return the maximum file size of the current process, in units of 512-byte blocks.
UL_SETFSIZE will attempt to set the maximum file size of the current process and its children, using the second argument (expressed as a
long).
RETURN VALUES
Upon successful completion, ulimit() returns the value requested; otherwise, the value -1 is returned and the global variable errno is set to
indicate the error.
ERRORS
The ulimit() function will fail if:
[EINVAL] The command specified was invalid.
[EPERM] The limit specified to ulimit() would have raised the maximum limit value, and the caller is not the super-user.
SEE ALSO getrlimit(2)STANDARDS
The ulimit() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The ulimit() function first appeared in FreeBSD 5.0.
BUGS
The ulimit() function provides limited precision for setting and retrieving process limits. If there is a need for greater precision than
the type long provides, the getrlimit(2) and setrlimit(2) functions should be considered.
BSD January 4, 2003 BSD
Check Out this Related Man Page
ULIMIT(3) BSD Library Functions Manual ULIMIT(3)NAME
ulimit -- get and set process limits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ulimit.h>
long int
ulimit(int cmd, ...);
DESCRIPTION
The ulimit() function provides a method to query or alter resource limits of the calling process. The method to be performed is specified by
the cmd argument; possible values are:
UL_GETFSIZE Return the soft file size limit of the process. The value returned is in units of 512-byte blocks. If the result cannot be
represented in an object of type long int, the result is unspecified.
UL_SETFSIZE Set the hard and soft file size limits of the process to the value of the second argument passed, which is in units of
512-byte blocks, and which is expected to be of type long int. The new file size limit of the process is returned. Any
process may decrease the limit, but raising it is only permitted if the caller is the super-user.
If successful, the ulimit() function will not change the setting of errno.
RETURN VALUES
If successful, the ulimit() function returns the value of the requested limit. Otherwise, it returns -1, sets errno to indicate an error,
and the limit is not changed. Therefore, to detect an error condition applications should set errno to 0, call ulimit(), and check if -1 is
returned and errno is non-zero.
ERRORS
The ulimit() function will fail if:
[EINVAL] The cmd argument is not valid.
[EPERM] It was attempted to increase a limit, and the caller is not the super-user.
SEE ALSO getrlimit(2), setrlimit(2)STANDARDS
The ulimit() function conforms to X/Open System Interfaces and Headers Issue 5 (``XSH5'') and IEEE Std 1003.1-2001 (``POSIX.1''). It was
marked as obsolete in the IEEE Std 1003.1-2008 (``POSIX.1'') revision, which recommended the use of getrlimit(2) and setrlimit(2) instead,
noting that because ulimit() uses the type long rather than rlim_t, it may not be sufficient for file sizes on many current systems.
BSD April 30, 2010 BSD
i've encountered the following problem with sco unixware7.
after using the "ulimit -f unlimited" command and then using "ulimit -a" it lists the filesize as unlimited.
BUT, when type the ulimit command without parameters, the output is given as 4194303
so i can't create a file bigger than... (4 Replies)
I want to know the interrupt passed to a process through 'ulimit'
I am running a process which gets killed when the 'ulimit -t' reaches.
But after killing the process I want to start another process which would
send a message or do some clean up or anything at all.
To do the same I am... (5 Replies)
Hi,
I have a Sun machine 5.8 and would like to modify the ulimit parameter for numner of file descriptors.
the output of plimit <process name> is:
4100: process_name
resource current maximum
time(seconds) unlimited unlimited
file(blocks) ... (8 Replies)
as we know, ulimit can be used to limit the stack and heap size of a process occupy. However, the space for 32-bits and 64 bits process are different.
for example, "ulimit -s xxxx" only limit the stack size of 32- bits process, am I right?
How to limit the size of 64-bits process?
thanks a... (5 Replies)
Hi there,
I am working on AIX and i dont have permission for /etc/security/limits file.
In the man page of ulimit it is mentioned that it will get the limitations for me from /etc/security/limits file.
the file permission for ulimit command is
-r-xr-xr-x 15 bin bin ... (6 Replies)
Hi,
We have an AIX system on oslevel 5.2 and we have the current limits set for the user "XXX"
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 1024000
stack(kbytes) 32768
memory(kbytes) unlimited
coredump(blocks) 2097151... (4 Replies)
I would like to set the maximum number or open files per process to be greater than 1024000 (for specific application scalability purpose). I am using RHEL 5.3/Ext4.
%sysctl fs.file-max
fs.file-max = 164766821
I also have added the folloing to /etc/security/limits.conf
* ... (7 Replies)
Hello,
How can I setup the ulimit for memory permanent
ulimit -m unlimited
ulimit -a Output from the ulimit command should be similar to the following:time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 2097152
stack(kbytes) 32768... (4 Replies)
Hi, All
I need to increase the ulimit value permanently without changing /etc/system file. i.e nofiles descriptor.
For all NIS Users logging in.
I know the command to do this:
# ulimit -Sn 4096
This change is temporary.
So, I went on adding this command in the /etc/profile.
... (6 Replies)
I got a question on ulimit on HP-UX. I have a log file that gets more than 2 GB and the application crashes because it can not write to log. I browsed through the forum and found one very similar post on ulimit but that was not concluded. Did some analysis and below is some output.
>getconf... (6 Replies)
Hi guys,
i'm a student in IT specially AIX.
I'm from france and i'm not very fluent in english.
My problem is about create an mksysb from a NIM MASTER
0512-005 mksysb: Backup Completed.urred for rootvg.
than thThe backup command completed with errors.
backup: The messages displayed on... (12 Replies)
Hi,
what are the ideal/best/recommended ulimit settings for a root user in AIX?
I understand that it depends on our environment. But I would like to know...what are settings you guys use in your environment for best performance.
default:
fsize = 2097151
core = 2097151
... (8 Replies)