mkfifo, mkfifoat - make a FIFO special file (a named pipe)
#include <sys/types.h> #include <sys/stat.h> int mkfifo(const char *pathname, mode_t mode); #include <fcntl.h> /* Definition of AT_* constants */ #include <sys/stat.h> int mkfifoat(int dirfd, const char *pathname, mode_t mode); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): mkfifoat(): Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _ATFILE_SOURCE
mkfifo() makes a FIFO special file with name pathname. mode specifies the FIFO's permissions. It is modified by the process's umask in the usual way: the permissions of the created file are (mode & ~umask). A FIFO special file is similar to a pipe, except that it is created in a different way. Instead of being an anonymous communications channel, a FIFO special file is entered into the filesystem by calling mkfifo(). Once you have created a FIFO special file in this way, any process can open it for reading or writing, in the same way as an ordinary file. However, it has to be open at both ends simultaneously before you can proceed to do any input or output operations on it. Opening a FIFO for reading normally blocks until some other process opens the same FIFO for writing, and vice versa. See fifo(7) for nonblocking handling of FIFO special files. mkfifoat() The mkfifoat() function operates in exactly the same way as mkfifo(), except for the differences described here. If the pathname given in pathname is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd (rather than relative to the current working directory of the calling process, as is done by mkfifo() for a relative pathname). If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is interpreted relative to the current working directory of the calling process (like mkfifo()). If pathname is absolute, then dirfd is ignored.
On success mkfifo() and mkfifoat() return 0. In the case of an error, -1 is returned (in which case, errno is set appropriately).
EACCES One of the directories in pathname did not allow search (execute) permission. EDQUOT The user's quota of disk blocks or inodes on the filesystem has been exhausted. EEXIST pathname already exists. This includes the case where pathname is a symbolic link, dangling or not. ENAMETOOLONG Either the total length of pathname is greater than PATH_MAX, or an individual filename component has a length greater than NAME_MAX. In the GNU system, there is no imposed limit on overall filename length, but some filesystems may place limits on the length of a component. ENOENT A directory component in pathname does not exist or is a dangling symbolic link. ENOSPC The directory or filesystem has no room for the new file. ENOTDIR A component used as a directory in pathname is not, in fact, a directory. EROFS pathname refers to a read-only filesystem. The following additional errors can occur for mkfifoat(): EBADF dirfd is not a valid file descriptor. ENOTDIR pathname is a relative path and dirfd is a file descriptor referring to a file other than a directory.
mkfifoat() was added to glibc in version 2.4. It is implemented using mknodat(2), available on Linux since kernel 2.6.16.
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────┼───────────────┼─────────┤ │mkfifo(), mkfifoat() │ Thread safety │ MT-Safe │ └─────────────────────┴───────────────┴─────────┘
mkfifo(): POSIX.1-2001, POSIX.1-2008. mkfifoat(): POSIX.1-2008.
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
XtCreateWidget(3) - create and destroy widgets (Man Page)...
The XtCreateWidget function performs much of the boilerplate operations of widget creation: * Checks to see if the class_initialize procedure has been called fo
insstr(3ncurses) - insert string before cursor in a curses w
These routines insert a character string (as many characters as will fit on the line) before the character under the cursor. All characters to the right of the
glMultiTexCoord1fvARB(3gl) - set the current texture coordin
glMultiTexCoordARB specifies texture coordinates in one, two, three, or four dimensions. glMultiTexCoord1ARB sets the current texture coordinates to (s, 0, 0, 1
pam_filter(8) - PAM filter module - Linux manual page.......
This module is intended to be a platform for providing access to all of the input/output that passes between the user and the application. It is only suitable f
Xmark(1) - summarize x11perf results - Linux manual page....
Xmark is a shell script that reads the indicated datafile and compiles a benchmark which it writes to standard output. It writes three numbers: A weighted perfo
itclextendedclass(n) create a extendedclass of objects......
The fundamental construct in [incr Tcl] is the extendedclass definition. Each extendedclass acts as a template for actual objects that can be created. The exten
systemd-getty-generator(8) Generator for enabling getty inst
systemd-getty-generator is a generator that automatically instantiates serial-getty@.service on the kernel console /dev/console if that is not directed to the v
gnutls_x509_privkey_cpy(3) - API function - Linux man page
This function will copy a private key from source to destination key. Destination has to be initialized. RETURNS On success, GNUTLS_E_SUCCESS (0) is returned, o
pic(1) - compile pictures for troff or TeX - Linux man page
This manual page describes the GNU version of pic, which is part of the groff document formatting system. pic compiles descriptions of pictures embedded within
gtk-query-immodules-3.0-64(1) - Input method module registra
gtk-query-immodules-3.0 collects information about loadable input method modules for GTK+ and writes it to the default cache file location, or to stdout. If cal
FD_CLR(3) - synchronous I/O multiplexing - Linux man page...
select() and pselect() allow a program to monitor multiple file descriptors, waiting until one or more of the file descriptors become ready for some class of I/
mysqlimport(1) - a data import program - Linux manual page
The mysqlimport client provides a command-line interface to the LOAD DATA INFILE SQL statement. Most options to mysqlimport correspond directly to clauses of LO