PCI_WRITE_LEGACY_IO(9) Hardware Interfaces PCI_WRITE_LEGACY_IO(9)NAME
pci_write_legacy_io - write byte(s) to legacy I/O port space
SYNOPSIS
ssize_t pci_write_legacy_io(struct kobject * kobj, struct bin_attribute * bin_attr, char * buf, loff_t off, size_t count);
ARGUMENTS
kobj
kobject corresponding to file to read from
bin_attr
struct bin_attribute for this file
buf
buffer containing value to be written
off
offset into legacy I/O port space
count
number of bytes to write
DESCRIPTION
Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific callback routine (pci_legacy_write).
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 PCI_WRITE_LEGACY_IO(9)
Check Out this Related Man Page
PREAD(2) Linux Programmer's Manual PREAD(2)NAME
pread, pwrite - read from or write to a file descriptor at a given offset
SYNOPSIS
#define _XOPEN_SOURCE 500
#include <unistd.h>
ssize_t pread(int fd, void *buf, size_t count, off_t offset);
ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
DESCRIPTION
pread() reads up to count bytes from file descriptor fd at offset offset (from the start of the file) into the buffer starting at buf. The
file offset is not changed.
pwrite() writes up to count bytes from the buffer starting at buf to the file descriptor fd at offset offset. The file offset is not
changed.
The file referenced by fd must be capable of seeking.
RETURN VALUE
On success, the number of bytes read or written is returned (zero indicates that nothing was written, in the case of pwrite(), or end of
file, in the case of pread()), or -1 on error, in which case errno is set to indicate the error.
ERRORS
pread() can fail and set errno to any error specified for read(2) or lseek(2). pwrite() can fail and set errno to any error specified for
write(2) or lseek(2).
VERSIONS
The pread() and pwrite() system calls were added to Linux in version 2.1.60; the entries in the i386 system call table were added in
2.1.69. C library support (including emulation using lseek(2) on older kernels without the system calls) was added in glibc 2.1.
CONFORMING TO
POSIX.1-2001.
SEE ALSO lseek(2), read(2), write(2), feature_test_macros(7)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-12-03 PREAD(2)
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