Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #504
Difficulty: Medium
Typically, programs operate in a reverse-linear flow of control.
True or False?
Linux & Unix Commands - Search Man Pages

mkstemp(3) [bsd man page]

MKTEMP(3)						     Library Functions Manual							 MKTEMP(3)

NAME
mktemp - make a unique file name SYNOPSIS
char *mktemp(template) char *template; mkstemp(template) char *template; DESCRIPTION
Mktemp creates a unique file name and returns the address of the template. The template should contain a file name with trailing X's, nor- mally something like /tmp/tempXXXXXX. The X's are replaced by the current process number and/or a unique letter combination. Mkstemp makes the same replacement to the template but opens the template file and returns a file descriptor open for reading and writing. Mkstemp avoids the race between testing whether the file exists and opening it for use. The number of file name combinations mktemp and mkstemp will try depends on the number of X's placed on the end of the template; six X's will result in them trying roughly 26 ** 6 combinations. SEE ALSO
access(2), getpid(2), open(2) DIAGNOSTICS
Mktemp returns NULL on failure, mkstemp returns -1 if no suitable file could be created. 7th Edition April 10, 1987 MKTEMP(3)

Check Out this Related Man Page

MKTEMP(3)						     Linux Programmer's Manual							 MKTEMP(3)

NAME
mktemp - make a unique temporary filename SYNOPSIS
#include <stdlib.h> char *mktemp(char *template); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): mktemp(): Since glibc 2.12: _BSD_SOURCE || _SVID_SOURCE || (_XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) Before glibc 2.12: _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED DESCRIPTION
The mktemp() function generates a unique temporary filename from template. The last six characters of template must be XXXXXX and these are replaced with a string that makes the filename unique. Since it will be modified, template must not be a string constant, but should be declared as a character array. RETURN VALUE
The mktemp() function always returns template. If a unique name was created, the last six bytes of template 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, template is made an empty string. ERRORS
EINVAL The last six characters of template were not XXXXXX. CONFORMING TO
4.3BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of mktemp(). NOTES
The prototype is in <unistd.h> for libc4, libc5, glibc1; glibc2 follows the Single UNIX Specification and has the prototype in <stdlib.h>. BUGS
Never use 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 test- ing whether the name exists and opening the file, every use of mktemp() is a security risk. The race is avoided by mkstemp(3). SEE ALSO
mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2010-09-20 MKTEMP(3)

9 More Discussions You Might Find Interesting

1. AIX

PROBLEM: RSYNC and no user password "secrets"

OK, I am stuck and could use some help here. I have a RSYNC script that I wrote to where I would like to have the users password "never" initiated. I been trying to get the /etc/rsyncd.secrets file to work, but keep getting error messages. But I think it has to do with the way my script is... (2 Replies)
Discussion started by: tfort73
2 Replies

2. Red Hat

rsync not working

I have tried rsync command as shown below, (if directory doesn't not exist on destination, i needs to create directories and sub directories through rsync at the destination server.) Note: Here /thaks/new/28/ directories doesn't exists on destination, How to create this on destination via rsync... (1 Reply)
Discussion started by: thakshina
1 Replies

3. Programming

/usr/bin/ld: cannot find -lpam

I'm trying to compile sudo on RHEL 4.8 and during the make I get the this error. Does anyone know what package I'm missing? gcc -o sudo sudo_auth.o pam.o mkstemps.o ldap.o exec_pty.o get_pty.o iolog.o audit.o boottime.o check.o env.o exec.o getspwuid.o gettime.o goodpath.o fileops.o find_path.o... (2 Replies)
Discussion started by: woodson2
2 Replies

4. UNIX for Advanced & Expert Users

Issue while Rsync

hi All, i am using Rsync from my Production server to Drill server, it has copied most of the direcoties/files available on the source server to the production server. but i have seen a strange situation here. like in one of the directory it has copied maximum of the files but later on it got... (2 Replies)
Discussion started by: lovelysethii
2 Replies

5. Programming

Storing a Temporary File Using C

How would someone save a file such as /etc/vpnc/test.conf locally into a temp file, so it can be queried? So for example if I used rsync to copy this file locally, how would I add that to a temp_file variable and discard it using unlink? #include <stdio.h> #include "error.h" ... (15 Replies)
Discussion started by: metallica1973
15 Replies

6. Solaris

Rsync failing

Hi, I am running a rsync command from one server to another server. Source server is having user - bfdeploy and destination user is ftcjbd. Though ftcjbd is owner of /ftc/envs/static/includes/vehicles on destination server, it is still giving error "mkstemp - Permission denied". I am not able to... (4 Replies)
Discussion started by: solaris_1977
4 Replies

7. AIX

Compiling problem - AIX 7.2

Hi We meet errors while running configuration scripts to prepare compiling source code on AIX 7.2. This error does not happen on AIX5.3 and AIX6.1 With the “/usr/bin/sh” from AIX7.2, sometimes , the script runs sucessfully, sometimes not. It’s unstable, and I don’t know why. When... (10 Replies)
Discussion started by: bobochacha29
10 Replies

8. Programming

C fdopen with and without -ansi

I have very little experience with gcc compilation under different environments, so please bear with me. I carried over 20 years old project into Ubuntu 18.04, it has old style K&R parameters, no function declarations to speak of, many functions without return are not declared void, and on and... (8 Replies)
Discussion started by: migurus
8 Replies

9. UNIX for Beginners Questions & Answers

NTP synchronised problem in our Centos 7.6 node

Someone, please help on this issue:- Note : for security reason i didn't mention hostnames and ips. ============================================================================== # ntpstat unsynchronised polling server every 1024 s Ntpstat showing unsynchronised. ... (29 Replies)
Discussion started by: shanmugaraj
29 Replies

Featured Tech Videos