write
Remonter à Io.h - Index
Header File
io.h
Category
Input/output Routines
Prototype
int write(int handle, void *buf, unsigned len);
Description
Writes to a file.
write writes a buffer of data to the file or device named by the given handle. handle is a file handle obtained from a creat, open, dup, or dup2 call.
This function attempts to write len bytes from the buffer pointed to by buf to the file associated with handle. Except when write is used to write to a text file, the number of bytes written to the file will be no more than the number requested. The maximum number of bytes that write can write is UINT_MAX -1, because UINT_MAX is the same as -1, which is the error return indicator for write. On text files, when write sees a linefeed (LF) character, it outputs a CR/LF pair. UINT_MAX is defined in limits.h.
If the number of bytes actually written is less than that requested, the condition should be considered an error and probably indicates a full disk. For disks or disk files, writing always proceeds from the current file pointer. For devices, bytes are sent directly to the device. For files opened with the O_APPEND option, the file pointer is positioned to EOF by write before writing the data.
Return Value
write returns the number of bytes written. A write to a text file does not count generated carriage returns. In case of error, write returns -1 and sets the global variable errno to one of the following values:
EACCES |
Permission denied |
EBADF |
Bad file number |
Example
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys\stat.h>
#include <io.h>
#include <string.h>
int main(void)
{
int handle;
char string[40];
int length, res;
/*
Create a file named "TEST.$$$" in the current directory and write a string to it. If "TEST.$$$" already exists, it will be overwritten.
*/
if ((handle = open("TEST.$$$", O_WRONLY | O_CREAT | O_TRUNC,
S_IREAD | S_IWRITE)) == -1)
{
printf("Error opening file.\n");
exit(1);
}
strcpy(string, "Hello, world!\n");
length = strlen(string);
if ((res = write(handle, string, length)) != length)
{
printf("Error writing to the file.\n");
exit(1);
}
printf("Wrote %d bytes to the file.\n", res);
close(handle);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ |
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+ |
+ |