Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ulimit(3) [freebsd 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 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 in units of 512 blocks of the current process. UL_SETFSIZE will attempt to set the maximum file size of the current process and its children with 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
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

ulimit problem

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)
Discussion started by: roydv
4 Replies

2. UNIX for Advanced & Expert Users

Trapping Interrupt From 'ulimit'

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)
Discussion started by: mrnuttynuts
5 Replies

3. Shell Programming and Scripting

Setting Ulimit

How do i set ulimit for user (4 Replies)
Discussion started by: Krrishv
4 Replies

4. Solaris

ulimit command

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)
Discussion started by: inquirer
8 Replies

5. UNIX for Advanced & Expert Users

ulimit and 64 bits process

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)
Discussion started by: tommy_cs
5 Replies

6. UNIX for Dummies Questions & Answers

ulimit and /etc/security/limits file permission

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)
Discussion started by: quintet
6 Replies

7. UNIX for Advanced & Expert Users

ulimit nofiles

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)
Discussion started by: jerardfjay
4 Replies

8. UNIX for Advanced & Expert Users

setting ulimit -n with a value more than 1024000

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)
Discussion started by: Hsianglung Wu
7 Replies

9. AIX

AIX 6.1 Kernal Parameters ulimit

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)
Discussion started by: filosophizer
4 Replies

10. Solaris

ulimit

how do i check the ulimit set on my server.. ca i know whats the command ?? thanks in advance .. (5 Replies)
Discussion started by: expert
5 Replies

11. Solaris

Modify ulimit nofiles descriptor

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)
Discussion started by: santh08
6 Replies

12. HP-UX

Individual file size limit on HP-UX

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)
Discussion started by: asutoshch
6 Replies

13. Red Hat

ulimit command

In Linux, What is the difference between using this command ulimit -c `ulimit -cH` and ulimit -c `ulimit -Hc` ? Thanks (4 Replies)
Discussion started by: mrn6430
4 Replies

14. AIX

0511-432 mksysb ulimit

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)
Discussion started by: Tharsan
12 Replies

15. AIX

What are the ideal ulimit settings for root user in AIX?

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)
Discussion started by: System Admin 77
8 Replies