sync(2) — Справочная страница Linux

sync(2)                    System Calls Manual                   sync(2)

ИМЯ

       sync, syncfs - commit filesystem caches to disk

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <unistd.h>

       void sync(void);

       int syncfs(int fd);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       sync():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE

       syncfs():
           _GNU_SOURCE

ОПИСАНИЕ

       sync() causes all pending modifications to filesystem metadata
       and cached file data to be written to the underlying filesystems.

       syncfs() is like sync(), but synchronizes just the filesystem
       containing file referred to by the open file descriptor fd.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       syncfs() returns 0 on success; on error, it returns -1 and sets
       errno to indicate the error.

ОШИБКИ

       sync() is always successful.

       syncfs() can fail for at least the following reasons:

       EBADF  fd is not a valid file descriptor.

       EIO    An error occurred during synchronization.  This error may
              relate to data written to any file on the filesystem, or
              on metadata related to the filesystem itself.

       ENOSPC Disk space was exhausted while synchronizing.

       ENOSPC
       EDQUOT Data was written to a file on NFS or another filesystem
              which does not allocate space at the time of a write(2)
              system call, and some previous write failed due to
              insufficient storage space.

ВЕРСИИ

       According to the standard specification (e.g., POSIX.1-2001),
       sync() schedules the writes, but may return before the actual
       writing is done.  However Linux waits for I/O completions, and
       thus sync() or syncfs() provide the same guarantees as fsync()
       called on every file in the system or filesystem respectively.

СТАНДАРТЫ

       sync() POSIX.1-2008.

       syncfs()
              Linux.

ИСТОРИЯ

       sync() POSIX.1-2001, SVr4, 4.3BSD.

       syncfs()
              Linux 2.6.39, glibc 2.14.

       Since glibc 2.2.2, the Linux prototype for sync() is as listed
       above, following the various standards.  In glibc 2.2.1 and
       earlier, it was "int sync(void)", and sync() always returned 0.

       In mainline kernel versions prior to Linux 5.8, syncfs() will
       fail only when passed a bad file descriptor (EBADF).  Since Linux
       5.8, syncfs() will also report an error if one or more inodes
       failed to be written back since the last syncfs() call.

ОШИБКИ

       Before Linux 1.3.20, Linux did not wait for I/O to complete
       before returning.

СМОТРИТЕ ТАКЖЕ

       sync(1), fdatasync(2), fsync(2)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                        sync(2)

Страницы, которые ссылаются на эту страницу: sync(1), systemd-nspawn(1), bdflush(2), fsync(2), mount(2), reboot(2), sync_file_range(2), syscalls(2), fclose(3), fflush(3), nfs(5), ctrlaltdel(8), fdisk(8), fsck.minix(8), mke2fs(8), mount(8), xfs_io(8), xfs_quota(8)