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|
# SOME DESCRIPTIVE TITLE
# Copyright (C) YEAR Free Software Foundation, Inc.
# This file is distributed under the same license as the PACKAGE package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"POT-Creation-Date: 2024-03-01 16:55+0100\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"Language: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
#. type: TH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "eventfd"
msgstr ""
#. type: TH
#: archlinux fedora-40 fedora-rawhide mageia-cauldron
#, no-wrap
msgid "2023-10-31"
msgstr ""
#. type: TH
#: archlinux fedora-40 fedora-rawhide mageia-cauldron
#, no-wrap
msgid "Linux man-pages 6.06"
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "NAME"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "eventfd - create a file descriptor for event notification"
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "LIBRARY"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "Standard C library (I<libc>, I<-lc>)"
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "SYNOPSIS"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<#include E<lt>sys/eventfd.hE<gt>>\n"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<int eventfd(unsigned int >I<initval>B<, int >I<flags>B<);>\n"
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "DESCRIPTION"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"B<eventfd>() creates an \"eventfd object\" that can be used as an event "
"wait/notify mechanism by user-space applications, and by the kernel to "
"notify user-space applications of events. The object contains an unsigned "
"64-bit integer (I<uint64_t>) counter that is maintained by the kernel. "
"This counter is initialized with the value specified in the argument "
"I<initval>."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"As its return value, B<eventfd>() returns a new file descriptor that can be "
"used to refer to the eventfd object."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The following values may be bitwise ORed in I<flags> to change the behavior "
"of B<eventfd>():"
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<EFD_CLOEXEC> (since Linux 2.6.27)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Set the close-on-exec (B<FD_CLOEXEC>) flag on the new file descriptor. See "
"the description of the B<O_CLOEXEC> flag in B<open>(2) for reasons why this "
"may be useful."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<EFD_NONBLOCK> (since Linux 2.6.27)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Set the B<O_NONBLOCK> file status flag on the open file description (see "
"B<open>(2)) referred to by the new file descriptor. Using this flag saves "
"extra calls to B<fcntl>(2) to achieve the same result."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<EFD_SEMAPHORE> (since Linux 2.6.30)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Provide semaphore-like semantics for reads from the new file descriptor. "
"See below."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Up to Linux 2.6.26, the I<flags> argument is unused, and must be specified "
"as zero."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The following operations can be performed on the file descriptor returned by "
"B<eventfd>():"
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<read>(2)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Each successful B<read>(2) returns an 8-byte integer. A B<read>(2) fails "
"with the error B<EINVAL> if the size of the supplied buffer is less than 8 "
"bytes."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The value returned by B<read>(2) is in host byte order\\[em]that is, the "
"native byte order for integers on the host machine."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The semantics of B<read>(2) depend on whether the eventfd counter currently "
"has a nonzero value and whether the B<EFD_SEMAPHORE> flag was specified when "
"creating the eventfd file descriptor:"
msgstr ""
#. type: IP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "\\[bu]"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"If B<EFD_SEMAPHORE> was not specified and the eventfd counter has a nonzero "
"value, then a B<read>(2) returns 8 bytes containing that value, and the "
"counter's value is reset to zero."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"If B<EFD_SEMAPHORE> was specified and the eventfd counter has a nonzero "
"value, then a B<read>(2) returns 8 bytes containing the value 1, and the "
"counter's value is decremented by 1."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"If the eventfd counter is zero at the time of the call to B<read>(2), then "
"the call either blocks until the counter becomes nonzero (at which time, the "
"B<read>(2) proceeds as described above) or fails with the error B<EAGAIN> "
"if the file descriptor has been made nonblocking."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<write>(2)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"A B<write>(2) call adds the 8-byte integer value supplied in its buffer to "
"the counter. The maximum value that may be stored in the counter is the "
"largest unsigned 64-bit value minus 1 (i.e., 0xfffffffffffffffe). If the "
"addition would cause the counter's value to exceed the maximum, then the "
"B<write>(2) either blocks until a B<read>(2) is performed on the file "
"descriptor, or fails with the error B<EAGAIN> if the file descriptor has "
"been made nonblocking."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"A B<write>(2) fails with the error B<EINVAL> if the size of the supplied "
"buffer is less than 8 bytes, or if an attempt is made to write the value "
"0xffffffffffffffff."
msgstr ""
#. type: TP
#: archlinux fedora-40 fedora-rawhide mageia-cauldron
#, no-wrap
msgid "B<poll>(2)"
msgstr ""
#. type: TQ
#: archlinux fedora-40 fedora-rawhide mageia-cauldron
#, no-wrap
msgid "B<select>(2)"
msgstr ""
#. type: TQ
#: archlinux fedora-40 fedora-rawhide mageia-cauldron
#, no-wrap
msgid "(and similar)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The returned file descriptor supports B<poll>(2) (and analogously "
"B<epoll>(7)) and B<select>(2), as follows:"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The file descriptor is readable (the B<select>(2) I<readfds> argument; the "
"B<poll>(2) B<POLLIN> flag) if the counter has a value greater than 0."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The file descriptor is writable (the B<select>(2) I<writefds> argument; the "
"B<poll>(2) B<POLLOUT> flag) if it is possible to write a value of at least "
"\"1\" without blocking."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"If an overflow of the counter value was detected, then B<select>(2) "
"indicates the file descriptor as being both readable and writable, and "
"B<poll>(2) returns a B<POLLERR> event. As noted above, B<write>(2) can "
"never overflow the counter. However an overflow can occur if 2\\[ha]64 "
"eventfd \"signal posts\" were performed by the KAIO subsystem (theoretically "
"possible, but practically unlikely). If an overflow has occurred, then "
"B<read>(2) will return that maximum I<uint64_t> value (i.e., "
"0xffffffffffffffff)."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The eventfd file descriptor also supports the other file-descriptor "
"multiplexing APIs: B<pselect>(2) and B<ppoll>(2)."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<close>(2)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"When the file descriptor is no longer required it should be closed. When "
"all file descriptors associated with the same eventfd object have been "
"closed, the resources for object are freed by the kernel."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"A copy of the file descriptor created by B<eventfd>() is inherited by the "
"child produced by B<fork>(2). The duplicate file descriptor is associated "
"with the same eventfd object. File descriptors created by B<eventfd>() are "
"preserved across B<execve>(2), unless the close-on-exec flag has been set."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "RETURN VALUE"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"On success, B<eventfd>() returns a new eventfd file descriptor. On error, "
"-1 is returned and I<errno> is set to indicate the error."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "ERRORS"
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<EINVAL>"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "An unsupported value was specified in I<flags>."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<EMFILE>"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The per-process limit on the number of open file descriptors has been "
"reached."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<ENFILE>"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The system-wide limit on the total number of open files has been reached."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<ENODEV>"
msgstr ""
#. Note from Davide:
#. The ENODEV error is basically never going to happen if
#. the kernel boots correctly. That error happen only if during
#. the kernel initialization, some error occur in the anonymous
#. inode source initialization.
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "Could not mount (internal) anonymous inode device."
msgstr ""
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<ENOMEM>"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "There was insufficient memory to create a new eventfd file descriptor."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "ATTRIBUTES"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"For an explanation of the terms used in this section, see B<attributes>(7)."
msgstr ""
#. type: tbl table
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Interface"
msgstr ""
#. type: tbl table
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Attribute"
msgstr ""
#. type: tbl table
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Value"
msgstr ""
#. type: tbl table
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-tumbleweed
#, no-wrap
msgid ".na\n"
msgstr ""
#. type: tbl table
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-tumbleweed
#, no-wrap
msgid ".nh\n"
msgstr ""
#. #-#-#-#-# archlinux: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# debian-bookworm: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: tbl table
#. #-#-#-#-# debian-unstable: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# fedora-40: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# fedora-rawhide: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# mageia-cauldron: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# opensuse-leap-15-6: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#. #-#-#-#-# opensuse-tumbleweed: eventfd.2.pot (PACKAGE VERSION) #-#-#-#-#
#. type: TP
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<eventfd>()"
msgstr ""
#. type: tbl table
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Thread safety"
msgstr ""
#. type: tbl table
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "MT-Safe"
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "VERSIONS"
msgstr ""
#. type: SS
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "C library/kernel differences"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"There are two underlying Linux system calls: B<eventfd>() and the more "
"recent B<eventfd2>(). The former system call does not implement a I<flags> "
"argument. The latter system call implements the I<flags> values described "
"above. The glibc wrapper function will use B<eventfd2>() where it is "
"available."
msgstr ""
#. type: SS
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Additional glibc features"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The GNU C library defines an additional type, and two functions that attempt "
"to abstract some of the details of reading and writing on an eventfd file "
"descriptor:"
msgstr ""
#. type: Plain text
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-tumbleweed
#, no-wrap
msgid ""
"typedef uint64_t eventfd_t;\n"
"\\&\n"
"int eventfd_read(int fd, eventfd_t *value);\n"
"int eventfd_write(int fd, eventfd_t value);\n"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The functions perform the read and write operations on an eventfd file "
"descriptor, returning 0 if the correct number of bytes was transferred, or "
"-1 otherwise."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "STANDARDS"
msgstr ""
#. type: Plain text
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-leap-15-6 opensuse-tumbleweed
msgid "Linux, GNU."
msgstr ""
#. type: SH
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "HISTORY"
msgstr ""
#. eventfd() is in glibc 2.7, but reportedly does not build
#. type: Plain text
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-leap-15-6 opensuse-tumbleweed
msgid "Linux 2.6.22, glibc 2.8."
msgstr ""
#. type: TP
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<eventfd2>()"
msgstr ""
#. type: Plain text
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Linux 2.6.27 (see VERSIONS). Since glibc 2.9, the B<eventfd>() wrapper "
"will employ the B<eventfd2>() system call, if it is supported by the kernel."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "NOTES"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"Applications can use an eventfd file descriptor instead of a pipe (see "
"B<pipe>(2)) in all cases where a pipe is used simply to signal events. The "
"kernel overhead of an eventfd file descriptor is much lower than that of a "
"pipe, and only one file descriptor is required (versus the two required for "
"a pipe)."
msgstr ""
#. or eventually syslets/threadlets
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"When used in the kernel, an eventfd file descriptor can provide a bridge "
"from kernel to user space, allowing, for example, functionalities like KAIO "
"(kernel AIO) to signal to a file descriptor that some operation is complete."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"A key point about an eventfd file descriptor is that it can be monitored "
"just like any other file descriptor using B<select>(2), B<poll>(2), or "
"B<epoll>(7). This means that an application can simultaneously monitor the "
"readiness of \"traditional\" files and the readiness of other kernel "
"mechanisms that support the eventfd interface. (Without the B<eventfd>() "
"interface, these mechanisms could not be multiplexed via B<select>(2), "
"B<poll>(2), or B<epoll>(7).)"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The current value of an eventfd counter can be viewed via the entry for the "
"corresponding file descriptor in the process's I</proc/>pidI</fdinfo> "
"directory. See B<proc>(5) for further details."
msgstr ""
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "EXAMPLES"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"The following program creates an eventfd file descriptor and then forks to "
"create a child process. While the parent briefly sleeps, the child writes "
"each of the integers supplied in the program's command-line arguments to the "
"eventfd file descriptor. When the parent has finished sleeping, it reads "
"from the eventfd file descriptor."
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid "The following shell session shows a sample run of the program:"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid ""
"$B< ./a.out 1 2 4 7 14>\n"
"Child writing 1 to efd\n"
"Child writing 2 to efd\n"
"Child writing 4 to efd\n"
"Child writing 7 to efd\n"
"Child writing 14 to efd\n"
"Child completed write loop\n"
"Parent about to read\n"
"Parent read 28 (0x1c) from efd\n"
msgstr ""
#. type: SS
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "Program source"
msgstr ""
#. type: Plain text
#: archlinux debian-unstable fedora-40 fedora-rawhide mageia-cauldron
#: opensuse-tumbleweed
#, no-wrap
msgid ""
"#include E<lt>err.hE<gt>\n"
"#include E<lt>inttypes.hE<gt>\n"
"#include E<lt>stdio.hE<gt>\n"
"#include E<lt>stdlib.hE<gt>\n"
"#include E<lt>sys/eventfd.hE<gt>\n"
"#include E<lt>unistd.hE<gt>\n"
"\\&\n"
"int\n"
"main(int argc, char *argv[])\n"
"{\n"
" int efd;\n"
" uint64_t u;\n"
" ssize_t s;\n"
"\\&\n"
" if (argc E<lt> 2) {\n"
" fprintf(stderr, \"Usage: %s E<lt>numE<gt>...\\en\", argv[0]);\n"
" exit(EXIT_FAILURE);\n"
" }\n"
"\\&\n"
" efd = eventfd(0, 0);\n"
" if (efd == -1)\n"
" err(EXIT_FAILURE, \"eventfd\");\n"
"\\&\n"
" switch (fork()) {\n"
" case 0:\n"
" for (size_t j = 1; j E<lt> argc; j++) {\n"
" printf(\"Child writing %s to efd\\en\", argv[j]);\n"
" u = strtoull(argv[j], NULL, 0);\n"
" /* strtoull() allows various bases */\n"
" s = write(efd, &u, sizeof(uint64_t));\n"
" if (s != sizeof(uint64_t))\n"
" err(EXIT_FAILURE, \"write\");\n"
" }\n"
" printf(\"Child completed write loop\\en\");\n"
"\\&\n"
" exit(EXIT_SUCCESS);\n"
"\\&\n"
" default:\n"
" sleep(2);\n"
"\\&\n"
" printf(\"Parent about to read\\en\");\n"
" s = read(efd, &u, sizeof(uint64_t));\n"
" if (s != sizeof(uint64_t))\n"
" err(EXIT_FAILURE, \"read\");\n"
" printf(\"Parent read %\"PRIu64\" (%#\"PRIx64\") from efd\\en\", u, u);\n"
" exit(EXIT_SUCCESS);\n"
"\\&\n"
" case -1:\n"
" err(EXIT_FAILURE, \"fork\");\n"
" }\n"
"}\n"
msgstr ""
#. SRC END
#. type: SH
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "SEE ALSO"
msgstr ""
#. type: Plain text
#: archlinux debian-bookworm debian-unstable fedora-40 fedora-rawhide
#: mageia-cauldron opensuse-leap-15-6 opensuse-tumbleweed
msgid ""
"B<futex>(2), B<pipe>(2), B<poll>(2), B<read>(2), B<select>(2), "
"B<signalfd>(2), B<timerfd_create>(2), B<write>(2), B<epoll>(7), "
"B<sem_overview>(7)"
msgstr ""
#. type: TH
#: debian-bookworm
#, no-wrap
msgid "2023-02-10"
msgstr ""
#. type: TH
#: debian-bookworm
#, no-wrap
msgid "Linux man-pages 6.03"
msgstr ""
#. type: TP
#: debian-bookworm debian-unstable opensuse-leap-15-6 opensuse-tumbleweed
#, no-wrap
msgid "B<poll>(2), B<select>(2) (and similar)"
msgstr ""
#. eventfd() is in glibc 2.7, but reportedly does not build
#. type: Plain text
#: debian-bookworm
msgid ""
"B<eventfd>() is available since Linux 2.6.22. Working support is provided "
"since glibc 2.8. The B<eventfd2>() system call (see NOTES) is available "
"since Linux 2.6.27. Since glibc 2.9, the B<eventfd>() wrapper will employ "
"the B<eventfd2>() system call, if it is supported by the kernel."
msgstr ""
#. type: Plain text
#: debian-bookworm
msgid "B<eventfd>() and B<eventfd2>() are Linux-specific."
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid "typedef uint64_t eventfd_t;\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
"int eventfd_read(int fd, eventfd_t *value);\n"
"int eventfd_write(int fd, eventfd_t value);\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
"#include E<lt>err.hE<gt>\n"
"#include E<lt>inttypes.hE<gt>\n"
"#include E<lt>stdio.hE<gt>\n"
"#include E<lt>stdlib.hE<gt>\n"
"#include E<lt>sys/eventfd.hE<gt>\n"
"#include E<lt>unistd.hE<gt>\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
"int\n"
"main(int argc, char *argv[])\n"
"{\n"
" int efd;\n"
" uint64_t u;\n"
" ssize_t s;\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" if (argc E<lt> 2) {\n"
" fprintf(stderr, \"Usage: %s E<lt>numE<gt>...\\en\", argv[0]);\n"
" exit(EXIT_FAILURE);\n"
" }\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" efd = eventfd(0, 0);\n"
" if (efd == -1)\n"
" err(EXIT_FAILURE, \"eventfd\");\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" switch (fork()) {\n"
" case 0:\n"
" for (size_t j = 1; j E<lt> argc; j++) {\n"
" printf(\"Child writing %s to efd\\en\", argv[j]);\n"
" u = strtoull(argv[j], NULL, 0);\n"
" /* strtoull() allows various bases */\n"
" s = write(efd, &u, sizeof(uint64_t));\n"
" if (s != sizeof(uint64_t))\n"
" err(EXIT_FAILURE, \"write\");\n"
" }\n"
" printf(\"Child completed write loop\\en\");\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid " exit(EXIT_SUCCESS);\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" default:\n"
" sleep(2);\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" printf(\"Parent about to read\\en\");\n"
" s = read(efd, &u, sizeof(uint64_t));\n"
" if (s != sizeof(uint64_t))\n"
" err(EXIT_FAILURE, \"read\");\n"
" printf(\"Parent read %\"PRIu64\" (%#\"PRIx64\") from efd\\en\", u, u);\n"
" exit(EXIT_SUCCESS);\n"
msgstr ""
#. type: Plain text
#: debian-bookworm opensuse-leap-15-6
#, no-wrap
msgid ""
" case -1:\n"
" err(EXIT_FAILURE, \"fork\");\n"
" }\n"
"}\n"
msgstr ""
#. type: TH
#: debian-unstable opensuse-tumbleweed
#, no-wrap
msgid "2023-07-20"
msgstr ""
#. type: TH
#: debian-unstable opensuse-tumbleweed
#, no-wrap
msgid "Linux man-pages 6.05.01"
msgstr ""
#. type: TH
#: opensuse-leap-15-6
#, no-wrap
msgid "2023-03-30"
msgstr ""
#. type: TH
#: opensuse-leap-15-6
#, no-wrap
msgid "Linux man-pages 6.04"
msgstr ""
|
