mkstemp, mkostemp, mkstemps, mkostemps - create a unique temporary file
#include <stdlib.h> int mkstemp(char *template); int mkostemp(char *template, int flags); int mkstemps(char *template, int suffixlen); int mkostemps(char *template, int suffixlen, int flags); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): mkstemp(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE mkostemp(): _GNU_SOURCE mkstemps(): /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE mkostemps(): _GNU_SOURCE
The mkstemp() function generates a unique temporary filename from template, creates and opens the file, and returns an open file descriptor for the file. 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. The file is created with permissions 0600, that is, read plus write for owner only. The returned file descriptor provides both read and write access to the file. The file is opened with the open(2) O_EXCL flag, guaranteeing that the caller is the process that creates the file. The mkostemp() function is like mkstemp(), with the difference that the following bits—with the same meaning as for open(2)—may be specified in flags: O_APPEND, O_CLOEXEC, and O_SYNC. Note that when creating the file, mkostemp() includes the values O_RDWR, O_CREAT, and O_EXCL in the flags argument given to open(2); including these values in the flags argument given to mkostemp() is unnecessary, and produces errors on some systems. The mkstemps() function is like mkstemp(), except that the string in template contains a suffix of suffixlen characters. Thus, template is of the form prefixXXXXXXsuffix, and the string XXXXXX is modified as for mkstemp(). The mkostemps() function is to mkstemps() as mkostemp() is to mkstemp().
On success, these functions return the file descriptor of the temporary file. On error, -1 is returned, and errno is set appropriately.
EEXIST Could not create a unique temporary filename. Now the contents of template are undefined. EINVAL For mkstemp() and mkostemp(): The last six characters of template were not XXXXXX; now template is unchanged. For mkstemps() and mkostemps(): template is less than (6 + suffixlen) characters long, or the last 6 characters before the suffix in template were not XXXXXX. These functions may also fail with any of the errors described for open(2).
mkostemp() is available since glibc 2.7. mkstemps() and mkostemps() are available since glibc 2.11.
For an explanation of the terms used in this section, see attributes(7). ┌────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────┼───────────────┼─────────┤ │mkstemp(), mkostemp(), │ Thread safety │ MT-Safe │ │mkstemps(), mkostemps() │ │ │ └────────────────────────┴───────────────┴─────────┘
mkstemp(): 4.3BSD, POSIX.1-2001. mkstemps(): unstandardized, but appears on several other systems. mkostemp() and mkostemps(): are glibc extensions.
In glibc versions 2.06 and earlier, the file is created with permissions 0666, that is, read and write for all users. This old behavior may be a security risk, especially since other UNIX flavors use 0600, and somebody might overlook this detail when porting programs. POSIX.1-2008 adds a requirement that the file be created with mode 0600. More generally, the POSIX specification of mkstemp() does not say anything about file modes, so the application should make sure its file mode creation mask (see umask(2)) is set appropriately before calling mkstemp() (and mkostemp()).
mkdtemp(3), mktemp(3), tempnam(3), tmpfile(3), tmpnam(3)
This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
More Linux Commands
pcbitctl.8 (Manual - Linux man page).......................
pcbitctl is a programm to load PCBIT-D firmware AUTHOR Pedro Roque Marques (email@example.com) SEE ALSO isdnctrl(8). pcbitctl.8 (Administration - Linux manual p
gnutls_pubkey_get_key_id(3) - API function - Linux man page
gnutls_pubkey_get_key_id.3 - This function will return a unique ID the depends on the public key parameters. This ID can be used in checking whether a certifica
XSetICValues(3) - set and obtain XIC values - Linux man page
The XSetICValues function returns NULL if no error occurred; otherwise, it returns the name of the first argument that could not be set. An argument might not b
XineramaQueryScreens(3) - API for Xinerama extension to X11
Xinerama is a simple library designed to interface the Xinerama Extension for retrieving information about physical output devices which may be combined into a
Mail::SpamAssassin::Plugin::Pyzor(3pm) - perform Pyzor check
Pyzor is a collaborative, networked system to detect and block spam using identifying digests of messages. See http://pyzor.sourceforge.net/ for more informatio
xmh(1) - send and read mail with an X interface to MH.......
The xmh program provides a graphical user interface to the MH Message Handling System. To actually do things with your mail, it makes calls to the MH package. E
is_cleared(3ncurses) - curses window properties (Man Page)
This implementation provides functions which return properties set in the WINDOW structure, allowing it to be opaque if the symbol NCURSES_OPAQUE is defined: is
spkac(1ssl) - SPKAC printing and generating utility.........
The spkac command processes Netscape signed public key and challenge ( SPKAC ) files. It can print out their contents, verify the signature and produce its own
tcp_table(5) - Postfix client/server table lookup protocol
REQUEST FORMAT REPLY FORMAT ENCODING SECURITY BUGS SEE ALSO README FILES LICENSE AUTHOR(S) NAME tcp_table - Postfix client/server table lookup protocol SYNOPSIS
XFilterEvent(3) - filter X events for an input method.......
If the window argument is None, XFilterEvent applies the filter to the window specified in the XEvent structure. The window argument is provided so that layers
__fpending(3) - interfaces to stdio FILE structure (ManPage)
Solaris introduced routines to allow portable access to the internals of the FILE structure, and glibc also implemented these. The __fbufsize() function returns
Tcl_ChannelOutputProc(3) - procedures for creating and manip
Tcl uses a two-layered channel architecture. It provides a generic upper layer to enable C and Tcl programs to perform input and output using the same APIs for