| .\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl) |
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| .\" Moved to man3, aeb, 980612 |
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| .TH ULIMIT 3 2021-03-22 "Linux" "Linux Programmer's Manual" |
| .SH NAME |
| ulimit \- get and set user limits |
| .SH SYNOPSIS |
| .nf |
| .B #include <ulimit.h> |
| .PP |
| .BI "long ulimit(int " cmd ", long " newlimit ); |
| .fi |
| .SH DESCRIPTION |
| Warning: this routine is obsolete. |
| Use |
| .BR getrlimit (2), |
| .BR setrlimit (2), |
| and |
| .BR sysconf (3) |
| instead. |
| For the shell command |
| .BR ulimit , |
| see |
| .BR bash (1). |
| .PP |
| The |
| .BR ulimit () |
| call will get or set some limit for the calling process. |
| The |
| .I cmd |
| argument can have one of the following values. |
| .TP |
| .B UL_GETFSIZE |
| Return the limit on the size of a file, in units of 512 bytes. |
| .TP |
| .B UL_SETFSIZE |
| Set the limit on the size of a file. |
| .TP |
| .B 3 |
| (Not implemented for Linux.) |
| Return the maximum possible address of the data segment. |
| .TP |
| .B 4 |
| (Implemented but no symbolic constant provided.) |
| Return the maximum number of files that the calling process can open. |
| .SH RETURN VALUE |
| On success, |
| .BR ulimit () |
| returns a nonnegative value. |
| On error, \-1 is returned, and |
| .I errno |
| is set to indicate the error. |
| .SH ERRORS |
| .TP |
| .B EPERM |
| An unprivileged process tried to increase a limit. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lbx lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR ulimit () |
| T} Thread safety MT-Safe |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH CONFORMING TO |
| SVr4, POSIX.1-2001. |
| POSIX.1-2008 marks |
| .BR ulimit () |
| as obsolete. |
| .SH SEE ALSO |
| .BR bash (1), |
| .BR getrlimit (2), |
| .BR setrlimit (2), |
| .BR sysconf (3) |