WRITE

Section: Linux Programmer's Manual (2)
Updated: 28 November 1993
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NAME

write - write to a file descriptor  

SYNOPSIS

#include <sys/types.h>
#include <unistd.h>

size_t write(int fd, const char *buf, size_t count);  

DESCRIPTION

write writes up to count bytes from file descriptor fd from the buffer starting at buf.  

RETURN VALUE

On success, the number of bytes written are returned (zero indicates nothing was written). On error, -1 (or MAXINT, as size_t is unsigned) is returned, and errno is set appropriately.  

ERRORS

EBADF
fd is not a valid file descriptor or is not open for writing.
EINVAL
fd is attached to an object which is unsuitable for writing.
EFAULT
buf is outside your accessible address space.
EPIPE
fd is connected to a pipe or socket whose reading end is closed. When this happens the writing process will receive a SIGPIPE signal; if it catches, blocks or ignores this the error EPIPE is returned.
EAGAIN
Non-blocking I/O has been selected using O_NONBLOCK and there was no room in the pipe or socket connected to fd to write the data immediately.
EINTR
The call was interrupted by a signal before any data was written.
ENOSPC
The device containing the file referred to by fd has no room for the data.

Other errors may occur, depending on the object connected to fd.

 

CONFORMING TO

SVID, AT&T, POSIX, X/OPEN, BSD 4.3  

SEE ALSO

open(2), read(2), fcntl(2), close(2), lseek(2), select(2), ioctl(2), fwrite(3).


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO

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