outb()函數(shù) Unix/Linux

1. outb()函數(shù) Unix/Linux

getpeername()函數(shù) Unix/Linux

1. getpeername()函數(shù) Unix/Linux

io_setup()函數(shù) Unix/Linux

1. io_setup()函數(shù) Unix/Linux

mknod()函數(shù) Unix/Linux

1. mknod()函數(shù) Unix/Linux

arch_prctl()函數(shù) Unix/Linux

1. arch_prctl()函數(shù) Unix/Linux

inotify_add_watch()函數(shù) Unix/Linux

1. inotify_add_watch()函數(shù) Unix/Linux

chmod()函數(shù) Unix/Linux

1. chmod()函數(shù) Unix/Linux

_exit()函數(shù) Unix/Linux

1. _exit()函數(shù) Unix/Linux

epoll_ctl()函數(shù) Unix/Linux

1. epoll_ctl()函數(shù) Unix/Linux

Unix/Linux系統(tǒng)調用

1. Unix/Linux系統(tǒng)調用

futimesat()函數(shù) Unix/Linux

1. futimesat()函數(shù) Unix/Linux

oldolduname()函數(shù) Unix/Linux

1. oldolduname()函數(shù) Unix/Linux

sched_rr_get_interval()函數(shù) Unix/Linux

1. sched_rr_get_interval()函數(shù) Unix/Linux

oldstat()函數(shù) Unix/Linux

1. oldstat()函數(shù) Unix/Linux

pselect()函數(shù) Unix/Linux

1. pselect()函數(shù) Unix/Linux

close()函數(shù) Unix/Linux

1. close()函數(shù) Unix/Linux

add_key()函數(shù) Unix/Linux

1. add_key()函數(shù) Unix/Linux

clone()函數(shù) Unix/Linux

1. clone()函數(shù) Unix/Linux

rename()函數(shù) Unix/Linux

1. rename()函數(shù) Unix/Linux

msgop()函數(shù) Unix/Linux

1. msgop()函數(shù) Unix/Linux

getrlimit()函數(shù) Unix/Linux

1. getrlimit()函數(shù) Unix/Linux

linkat()函數(shù) Unix/Linux

1. linkat()函數(shù) Unix/Linux

ioprio_set()函數(shù) Unix/Linux

1. ioprio_set()函數(shù) Unix/Linux

insw()函數(shù) Unix/Linux

1. insw()函數(shù) Unix/Linux

munlock()函數(shù) Unix/Linux

1. munlock()函數(shù) Unix/Linux

getgid()函數(shù) Unix/Linux

1. getgid()函數(shù) Unix/Linux

chdir()函數(shù) Unix/Linux

1. chdir()函數(shù) Unix/Linux

rmdir()函數(shù) Unix/Linux

1. rmdir()函數(shù) Unix/Linux

ioctl()函數(shù) Unix/Linux

1. ioctl()函數(shù) Unix/Linux

lchown()函數(shù) Unix/Linux

1. lchown()函數(shù) Unix/Linux

execve()函數(shù) Unix/Linux

1. execve()函數(shù) Unix/Linux

epoll_wait()函數(shù) Unix/Linux

1. epoll_wait()函數(shù) Unix/Linux

fstatat()函數(shù) Unix/Linux

1. fstatat()函數(shù) Unix/Linux

truncate()函數(shù) Unix/Linux

1. truncate()函數(shù) Unix/Linux

lock()函數(shù) Unix/Linux

1. lock()函數(shù) Unix/Linux

outsb()函數(shù) Unix/Linux

1. outsb()函數(shù) Unix/Linux

chroot()函數(shù) Unix/Linux

1. chroot()函數(shù) Unix/Linux

kexec_load()函數(shù) Unix/Linux

1. kexec_load()函數(shù) Unix/Linux

afs_syscall()函數(shù) Unix/Linux

1. afs_syscall()函數(shù) Unix/Linux

dup2()函數(shù) Unix/Linux

1. dup2()函數(shù) Unix/Linux

_newselect()函數(shù) Unix/Linux

1. _newselect()函數(shù) Unix/Linux

inotify_rm_watch()函數(shù) Unix/Linux

1. inotify_rm_watch()函數(shù) Unix/Linux

recv()函數(shù) Unix/Linux

1. recv()函數(shù) Unix/Linux

msgsnd()函數(shù) Unix/Linux

1. msgsnd()函數(shù) Unix/Linux

getdtablesize()函數(shù) Unix/Linux

1. getdtablesize()函數(shù) Unix/Linux

ioperm()函數(shù) Unix/Linux

1. ioperm()函數(shù) Unix/Linux

munmap()函數(shù) Unix/Linux

1. munmap()函數(shù) Unix/Linux

getpriority()函數(shù) Unix/Linux

1. getpriority()函數(shù) Unix/Linux

sched_get_priority_min()函數(shù) Unix/Linux

1. sched_get_priority_min()函數(shù) Unix/Linux

outw_p()函數(shù) Unix/Linux

1. outw_p()函數(shù) Unix/Linux

kill()函數(shù) Unix/Linux

1. kill()函數(shù) Unix/Linux

lookup_dcookie()函數(shù) Unix/Linux

1. lookup_dcookie()函數(shù) Unix/Linux

accept()函數(shù) Unix/Linux

1. accept()函數(shù) Unix/Linux

obsolete()函數(shù) Unix/Linux

1. obsolete()函數(shù) Unix/Linux

pread()函數(shù) Unix/Linux

1. pread()函數(shù) Unix/Linux

getgroups()函數(shù) Unix/Linux

1. getgroups()函數(shù) Unix/Linux

personality()函數(shù) Unix/Linux

1. personality()函數(shù) Unix/Linux

recvfrom()函數(shù) Unix/Linux

1. recvfrom()函數(shù) Unix/Linux

putpmsg()函數(shù) Unix/Linux

1. putpmsg()函數(shù) Unix/Linux

getgroups()函數(shù) Unix/Linux

1. getgroups()函數(shù) Unix/Linux

remap_file_pages()函數(shù) Unix/Linux

1. remap_file_pages()函數(shù) Unix/Linux

request_key()函數(shù) Unix/Linux

1. request_key()函數(shù) Unix/Linux

mount()函數(shù) Unix/Linux

1. mount()函數(shù) Unix/Linux

sched_setscheduler()函數(shù) Unix/Linux

1. sched_setscheduler()函數(shù) Unix/Linux

mkdirat()函數(shù) Unix/Linux

1. mkdirat()函數(shù) Unix/Linux

nfsservctl()函數(shù) Unix/Linux

1. nfsservctl()函數(shù) Unix/Linux

getuid()函數(shù) Unix/Linux

1. getuid()函數(shù) Unix/Linux

prof()函數(shù) Unix/Linux

1. prof()函數(shù) Unix/Linux

exit_group函數(shù) Unix/Linux

1. exit_group函數(shù) Unix/Linux

io_cancel()函數(shù) Unix/Linux

1. io_cancel()函數(shù) Unix/Linux

mmap()函數(shù) Unix/Linux

1. mmap()函數(shù) Unix/Linux

mremap()函數(shù) Unix/Linux

1. mremap()函數(shù) Unix/Linux

getitimer()函數(shù) Unix/Linux

1. getitimer()函數(shù) Unix/Linux

unimplemented()函數(shù) Unix/Linux

1. unimplemented()函數(shù) Unix/Linux

read()函數(shù) Unix/Linux

1. read()函數(shù) Unix/Linux

inl()函數(shù) Unix/Linux

1. inl()函數(shù) Unix/Linux

posix_fadvise()函數(shù) Unix/Linux

1. posix_fadvise()函數(shù) Unix/Linux

open()函數(shù) Unix/Linux

1. open()函數(shù) Unix/Linux

listen()函數(shù) Unix/Linux

1. listen()函數(shù) Unix/Linux

io_destroy()函數(shù) Unix/Linux

1. io_destroy()函數(shù) Unix/Linux

acct()函數(shù) Unix/Linux

1. acct()函數(shù) Unix/Linux

fcntl()函數(shù) Unix/Linux

1. fcntl()函數(shù) Unix/Linux

recvmsg()函數(shù) Unix/Linux

1. recvmsg()函數(shù) Unix/Linux

statfs()函數(shù) Unix/Linux

1. statfs()函數(shù) Unix/Linux

oldlstat()函數(shù) Unix/Linux

1. oldlstat()函數(shù) Unix/Linux

outb()函數(shù) Unix/Linux

1. outb()函數(shù) Unix/Linux

getpagesize()函數(shù) Unix/Linux

1. getpagesize()函數(shù) Unix/Linux

sched_yield()函數(shù) Unix/Linux

1. sched_yield()函數(shù) Unix/Linux

outw()函數(shù) Unix/Linux

1. outw()函數(shù) Unix/Linux

inw_p()函數(shù) Unix/Linux

1. inw_p()函數(shù) Unix/Linux

setpgid()函數(shù) Unix/Linux

1. setpgid()函數(shù) Unix/Linux

quotactl()函數(shù) Unix/Linux

1. quotactl()函數(shù) Unix/Linux

prctl()函數(shù) Unix/Linux

1. prctl()函數(shù) Unix/Linux

fattach()函數(shù) Unix/Linux

1. fattach()函數(shù) Unix/Linux

readahead()函數(shù) Unix/Linux

1. readahead()函數(shù) Unix/Linux

msgget()函數(shù) Unix/Linux

1. msgget()函數(shù) Unix/Linux

gethostname()函數(shù) Unix/Linux

1. gethostname()函數(shù) Unix/Linux

semctl()函數(shù) Unix/Linux

1. semctl()函數(shù) Unix/Linux

munlockall()函數(shù) Unix/Linux

1. munlockall()函數(shù) Unix/Linux

iopl()函數(shù) Unix/Linux

1. iopl()函數(shù) Unix/Linux

fdetach()函數(shù) Unix/Linux

1. fdetach()函數(shù) Unix/Linux

getuid()函數(shù) Unix/Linux

1. getuid()函數(shù) Unix/Linux

gettid()函數(shù) Unix/Linux

1. gettid()函數(shù) Unix/Linux

pwrite()函數(shù) Unix/Linux

1. pwrite()函數(shù) Unix/Linux

isastream()函數(shù) Unix/Linux

1. isastream()函數(shù) Unix/Linux

get_thread_area()函數(shù) Unix/Linux

1. get_thread_area()函數(shù) Unix/Linux

mpx()函數(shù) Unix/Linux

1. mpx()函數(shù) Unix/Linux

io_getevents()函數(shù) Unix/Linux

1. io_getevents()函數(shù) Unix/Linux

lstat()函數(shù) Unix/Linux

1. lstat()函數(shù) Unix/Linux

readv()函數(shù) Unix/Linux

1. readv()函數(shù) Unix/Linux

exit()函數(shù) Unix/Linux

1. exit()函數(shù) Unix/Linux

inw()函數(shù) Unix/Linux

1. inw()函數(shù) Unix/Linux

fchmod()函數(shù) Unix/Linux

1. fchmod()函數(shù) Unix/Linux

mq_getsetattr()函數(shù) Unix/Linux

1. mq_getsetattr()函數(shù) Unix/Linux

get_robust_list()函數(shù) Unix/Linux

1. get_robust_list()函數(shù) Unix/Linux

_llseek()函數(shù) Unix/Linux

1. _llseek()函數(shù) Unix/Linux

gettimeofday()函數(shù) Unix/Linux

1. gettimeofday()函數(shù) Unix/Linux

nice()函數(shù) Unix/Linux

1. nice()函數(shù) Unix/Linux

security()函數(shù) Unix/Linux

1. security()函數(shù) Unix/Linux

sched_get_priority_max()函數(shù) Unix/Linux

1. sched_get_priority_max()函數(shù) Unix/Linux

outb_p()函數(shù) Unix/Linux

1. outb_p()函數(shù) Unix/Linux

intro()函數(shù) Unix/Linux

1. intro()函數(shù) Unix/Linux

alarm()函數(shù) Unix/Linux

1. alarm()函數(shù) Unix/Linux

putmsg()函數(shù) Unix/Linux

1. putmsg()函數(shù) Unix/Linux

fork()函數(shù) Unix/Linux

1. fork()函數(shù) Unix/Linux

getpgrp()函數(shù) Unix/Linux

1. getpgrp()函數(shù) Unix/Linux

link()函數(shù) Unix/Linux

1. link()函數(shù) Unix/Linux

getcwd()函數(shù) Unix/Linux

1. getcwd()函數(shù) Unix/Linux

insl()函數(shù) Unix/Linux

1. insl()函數(shù) Unix/Linux

getsockname()函數(shù) Unix/Linux

1. getsockname()函數(shù) Unix/Linux

dup()函數(shù) Unix/Linux

1. dup()函數(shù) Unix/Linux

connect()函數(shù) Unix/Linux

1. connect()函數(shù) Unix/Linux

select()函數(shù) Unix/Linux

1. select()函數(shù) Unix/Linux

futex()函數(shù) Unix/Linux

1. futex()函數(shù) Unix/Linux

outsw()函數(shù) Unix/Linux

1. outsw()函數(shù) Unix/Linux

query_module()函數(shù) Unix/Linux

1. query_module()函數(shù) Unix/Linux

reboot()函數(shù) Unix/Linux

1. reboot()函數(shù) Unix/Linux

create_module()函數(shù) Unix/Linux

1. create_module()函數(shù) Unix/Linux

adjtimex()函數(shù) Unix/Linux

1. adjtimex()函數(shù) Unix/Linux

mlock()函數(shù) Unix/Linux

1. mlock()函數(shù) Unix/Linux

statvfs()函數(shù) Unix/Linux

1. statvfs()函數(shù) Unix/Linux

gtty()函數(shù) Unix/Linux

1. gtty()函數(shù) Unix/Linux

epoll_create()函數(shù) Unix/Linux

1. epoll_create()函數(shù) Unix/Linux

bind()函數(shù) Unix/Linux

1. bind()函數(shù) Unix/Linux

inl_p()函數(shù) Unix/Linux

1. inl_p()函數(shù) Unix/Linux

select_tut()函數(shù) Unix/Linux

1. select_tut()函數(shù) Unix/Linux

mincore()函數(shù) Unix/Linux

1. mincore()函數(shù) Unix/Linux

getresuid()函數(shù) Unix/Linux

1. getresuid()函數(shù) Unix/Linux

getpmsg()函數(shù) Unix/Linux

1. getpmsg()函數(shù) Unix/Linux

getcontext()函數(shù) Unix/Linux

1. getcontext()函數(shù) Unix/Linux

killpg()函數(shù) Unix/Linux

1. killpg()函數(shù) Unix/Linux

olduname()函數(shù) Unix/Linux

1. olduname()函數(shù) Unix/Linux

openat()函數(shù) Unix/Linux

1. openat()函數(shù) Unix/Linux

pause()函數(shù) Unix/Linux

1. pause()函數(shù) Unix/Linux

alloc_hugepages()函數(shù) Unix/Linux

1. alloc_hugepages()函數(shù) Unix/Linux

ioctl_list()函數(shù) Unix/Linux

1. ioctl_list()函數(shù) Unix/Linux

readlinkat()函數(shù) Unix/Linux

1. readlinkat()函數(shù) Unix/Linux

mprotect()函數(shù) Unix/Linux

1. mprotect()函數(shù) Unix/Linux

getdomainname()函數(shù) Unix/Linux

1. getdomainname()函數(shù) Unix/Linux

readlink()函數(shù) Unix/Linux

1. readlink()函數(shù) Unix/Linux

madvise()函數(shù) Unix/Linux

1. madvise()函數(shù) Unix/Linux

bdflush()函數(shù) Unix/Linux

1. bdflush()函數(shù) Unix/Linux

ipc()函數(shù) Unix/Linux

1. ipc()函數(shù) Unix/Linux

ptrace()函數(shù) Unix/Linux

1. ptrace()函數(shù) Unix/Linux

getrusage()函數(shù) Unix/Linux

1. getrusage()函數(shù) Unix/Linux

msync()函數(shù) Unix/Linux

1. msync()函數(shù) Unix/Linux

faccessat()函數(shù) Unix/Linux

1. faccessat()函數(shù) Unix/Linux

modify_ldt()函數(shù) Unix/Linux

1. modify_ldt()函數(shù) Unix/Linux

get_kernel_syms()函數(shù) Unix/Linux

1. get_kernel_syms()函數(shù) Unix/Linux

getpid()函數(shù) Unix/Linux

1. getpid()函數(shù) Unix/Linux

fsync()函數(shù) Unix/Linux

1. fsync()函數(shù) Unix/Linux

msgctl()函數(shù) Unix/Linux

1. msgctl()函數(shù) Unix/Linux

break未實現(xiàn) Unix/Linux

1. break未實現(xiàn) Unix/Linux

sched_setparam()函數(shù) Unix/Linux

1. sched_setparam()函數(shù) Unix/Linux

fchown()函數(shù) Unix/Linux

1. fchown()函數(shù) Unix/Linux

cacheflush()函數(shù) Unix/Linux

1. cacheflush()函數(shù) Unix/Linux

fdatasync()函數(shù) Unix/Linux

1. fdatasync()函數(shù) Unix/Linux

flock()函數(shù) Unix/Linux

1. flock()函數(shù) Unix/Linux

pivot_root()函數(shù) Unix/Linux

1. pivot_root()函數(shù) Unix/Linux

inotify_init()函數(shù) Unix/Linux

1. inotify_init()函數(shù) Unix/Linux

fchmodat()函數(shù) Unix/Linux

1. fchmodat()函數(shù) Unix/Linux

keyctl()函數(shù) Unix/Linux

1. keyctl()函數(shù) Unix/Linux

llseek()函數(shù) Unix/Linux

1. llseek()函數(shù) Unix/Linux

outb()函數(shù) Unix/Linux

1. outb()函數(shù) Unix/Linux

pipe()函數(shù) Unix/Linux

1. pipe()函數(shù) Unix/Linux

io_submit()函數(shù) Unix/Linux

1. io_submit()函數(shù) Unix/Linux

ppoll()函數(shù) Unix/Linux

1. ppoll()函數(shù) Unix/Linux

multiplexer()函數(shù) Unix/Linux

1. multiplexer()函數(shù) Unix/Linux

access()函數(shù) Unix/Linux

1. access()函數(shù) Unix/Linux

sched_getparam()函數(shù) Unix/Linux

1. sched_getparam()函數(shù) Unix/Linux

chown()函數(shù) Unix/Linux

1. chown()函數(shù) Unix/Linux

readdir()函數(shù) Unix/Linux

1. readdir()函數(shù) Unix/Linux

inb_p()函數(shù) Unix/Linux

1. inb_p()函數(shù) Unix/Linux

outsl()函數(shù) Unix/Linux

1. outsl()函數(shù) Unix/Linux

nanosleep()函數(shù) Unix/Linux

1. nanosleep()函數(shù) Unix/Linux

alloc_hugepages()函數(shù) Unix/Linux

1. alloc_hugepages()函數(shù) Unix/Linux

sbrk()函數(shù) Unix/Linux

1. sbrk()函數(shù) Unix/Linux

move_pages()函數(shù) Unix/Linux

1. move_pages()函數(shù) Unix/Linux

fchdir()函數(shù) Unix/Linux

1. fchdir()函數(shù) Unix/Linux

renameat()函數(shù) Unix/Linux

1. renameat()函數(shù) Unix/Linux

getppid()函數(shù) Unix/Linux

1. getppid()函數(shù) Unix/Linux

getsid()函數(shù) Unix/Linux

1. getsid()函數(shù) Unix/Linux

oldfstat()函數(shù) Unix/Linux

1. oldfstat()函數(shù) Unix/Linux

lseek()函數(shù) Unix/Linux

1. lseek()函數(shù) Unix/Linux

stat()函數(shù) Unix/Linux

1. stat()函數(shù) Unix/Linux

path_resolution()函數(shù) Unix/Linux

1. path_resolution()函數(shù) Unix/Linux

getunwind()函數(shù) Unix/Linux

1. getunwind()函數(shù) Unix/Linux

getsockopt()函數(shù) Unix/Linux

1. getsockopt()函數(shù) Unix/Linux

mmap2()函數(shù) Unix/Linux

1. mmap2()函數(shù) Unix/Linux

getdents()函數(shù) Unix/Linux

1. getdents()函數(shù) Unix/Linux

fchownat()函數(shù) Unix/Linux

1. fchownat()函數(shù) Unix/Linux

mkdir()函數(shù) Unix/Linux

1. mkdir()函數(shù) Unix/Linux

perfmonctl()函數(shù) Unix/Linux

1. perfmonctl()函數(shù) Unix/Linux

open()函數(shù) Unix/Linux

1. open()函數(shù) Unix/Linux

idle()函數(shù) Unix/Linux

1. idle()函數(shù) Unix/Linux

poll()函數(shù) Unix/Linux

1. poll()函數(shù) Unix/Linux

brk()函數(shù) Unix/Linux

1. brk()函數(shù) Unix/Linux

sched_setaffinity()函數(shù) Unix/Linux

1. sched_setaffinity()函數(shù) Unix/Linux

mlockall()函數(shù) Unix/Linux

1. mlockall()函數(shù) Unix/Linux

posix_fadvise()函數(shù) Unix/Linux

posix_fadvise - 預先聲明對文件數(shù)據(jù)的訪問模式

內(nèi)容簡介

#define _XOPEN_SOURCE 600 
#include <fcntl.h> 
int posix_fadvise(int fd, off_t offset, off_t len, int advice);

描述

程序可以使用 posix_fadvise() 公布的意圖來訪問文件中的數(shù)據(jù)在未來的特定圖案，從而允許內(nèi)核來執(zhí)行適當?shù)膬?yōu)化。

The advice applies to a (not necessarily existent) region starting at offset and extending for len bytes (or until the end of the file if len is 0) within the file referred to by fd. The advice is not binding; it merely constitutes an expectation on behalf of the application.

Permissible values for advice include:

標簽	描述
POSIX_FADV_NORMAL
	表示該應用程序沒有建議提供有關其指定的數(shù)據(jù)訪問模式。如果沒有意見，給出了一個打開的文件，這是默認的假設。
POSIX_FADV_SEQUENTIAL
	該應用程序需要訪問指定的數(shù)據(jù)順序（與以前高的人讀低偏移）。
POSIX_FADV_RANDOM
	將指定的數(shù)據(jù)將會以隨機順序進行訪問。
POSIX_FADV_NOREUSE
	將指定的數(shù)據(jù)將只訪問一次。
POSIX_FADV_WILLNEED
	將指定的數(shù)據(jù)將在不久的將來訪問。
POSIX_FADV_DONTNEED
	指定的數(shù)據(jù)不會在短期內(nèi)被訪問。

返回值

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

錯誤

標簽	描述
EBADF	The fd argument was not a valid file descriptor.
EINVAL	An invalid value was specified for advice.
ESPIPE	The specified file descriptor refers to a pipe or FIFO. (Linux actually returns EINVAL in this case.)

注意

posix_fadvise() appeared in kernel 2.5.60.

Under Linux, POSIX_FADV_NORMAL sets the readahead window to the default size for the backing device; POSIX_FADV_SEQUENTIAL doubles this size, andPOSIX_FADV_RANDOM disables file readahead entirely. These changes affect the entire file, not just the specified region (but other open file handles to the same file are unaffected).

POSIX_FADV_WILLNEED and POSIX_FADV_NOREUSE both initiate a non-blocking read of the specified region into the page cache. The amount of data read may be decreased by the kernel depending on VM load. (A few megabytes will usually be fully satisfied, and more is rarely useful.)

POSIX_FADV_DONTNEED attempts to free cached pages associated with the specified region. This is useful, for example, while streaming large files. A program may periodically request the kernel to free cached data that has already been used, so that more useful cached pages are not discarded instead.

Pages that have not yet been written out will be unaffected, so if the application wishes to guarantee that pages will be released, it should call fsync() or fdatasync() first.

遵循于

POSIX.1-2001. Note that the type of the len parameter was changed from size_t to off_tin POSIX.1-2003 TC5.

BUGS

In kernels before 2.6.6, if len was specified as 0, then this was interpreted literally as "zero bytes", rather than as meaning "all bytes through to the end of the file".

另請參閱

posix_madvise (2)
readahead (2)

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