From 3d08cd331c1adcf0d917392f7e527b3f00511748 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 24 May 2024 06:52:22 +0200 Subject: Merging upstream version 6.8. Signed-off-by: Daniel Baumann --- man/man3/mktemp.3 | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) create mode 100644 man/man3/mktemp.3 (limited to 'man/man3/mktemp.3') diff --git a/man/man3/mktemp.3 b/man/man3/mktemp.3 new file mode 100644 index 0000000..54e5b1f --- /dev/null +++ b/man/man3/mktemp.3 @@ -0,0 +1,118 @@ +'\" t +.\" Copyright (C) 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified Sat Jul 24 18:48:06 1993 by Rik Faith (faith@cs.unc.edu) +.\" Modified Fri Jun 23 01:26:34 1995 by Andries Brouwer (aeb@cwi.nl) +.\" (prompted by Scott Burkett ) +.\" Modified Sun Mar 28 23:44:38 1999 by Andries Brouwer (aeb@cwi.nl) +.\" +.TH mktemp 3 2024-05-02 "Linux man-pages (unreleased)" +.SH NAME +mktemp \- make a unique temporary filename +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include +.P +.BI "char *mktemp(char *" template ); +.fi +.P +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.P +.BR mktemp (): +.nf + Since glibc 2.12: + (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200112L) + || /* glibc >= 2.19: */ _DEFAULT_SOURCE + || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE + Before glibc 2.12: + _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 +.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED +.fi +.SH DESCRIPTION +.IR "Never use this function" ; +see BUGS. +.P +The +.BR mktemp () +function generates a unique temporary filename +from \fItemplate\fP. +The last six characters of \fItemplate\fP must +be XXXXXX and these are replaced with a string that makes the +filename unique. +Since it will be modified, +.I template +must not be a string constant, but should be declared as a character array. +.SH RETURN VALUE +The +.BR mktemp () +function always returns \fItemplate\fP. +If a unique name was created, the last six bytes of \fItemplate\fP will +have been modified in such a way that the resulting name is unique +(i.e., does not exist already) +If a unique name could not be created, +\fItemplate\fP is made an empty string, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EINVAL +The last six characters of \fItemplate\fP were not XXXXXX. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR mktemp () +T} Thread safety MT-Safe +.TE +.SH STANDARDS +None. +.SH HISTORY +4.3BSD, POSIX.1-2001. +Removed in POSIX.1-2008. +.\" .SH NOTES +.\" The prototype is in +.\" .I +.\" for libc4, libc5, glibc1; glibc2 follows the Single UNIX Specification +.\" and has the prototype in +.\" .IR . +.SH BUGS +Never use +.BR mktemp (). +Some implementations follow 4.3BSD +and replace XXXXXX by the current process ID and a single letter, +so that at most 26 different names can be returned. +Since on the one hand the names are easy to guess, and on the other +hand there is a race between testing whether the name exists and +opening the file, every use of +.BR mktemp () +is a security risk. +The race is avoided by +.BR mkstemp (3) +and +.BR mkdtemp (3). +.SH SEE ALSO +.BR mktemp (1), +.BR mkdtemp (3), +.BR mkstemp (3), +.BR tempnam (3), +.BR tmpfile (3), +.BR tmpnam (3) -- cgit v1.2.3