write

Writes a buffer of data to a socket or file.

Format 

#include  <unixio.h>

int write  (int d, void *buffer, int
           nbytes);

Arguments

d
A descriptor that must refer to a socket or file.
buffer
The address of contiguous storage from which the output data is taken.
nbytes
The maximum number of bytes involved in the write operation.

Description

This routine attempts to write a buffer of data to a socket or file.

See also socket in this section.

Return Values
x  The number of bytes written to the socket or file. 
0  Indicates an error. 
-1  Indicates an error; errno is set to one of the following:

  • EBADF - The d argument is not a valid descriptor open for writing.

  • EPIPE - An attempt was made to write to a socket that is not open for reading by any process.

  • EFAULT - Part of the array pointed to by iov or data to be written to the file points outside the process's allocated address space.

  • EWOULDBLOCK - The NBIO (nonblocking) flag is set for the socket descriptor and the process would be delayed in the write operation.

  • EINVAL - The nbytes argument is negative.
 

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