NAME write - write to a file descriptor SYNOPSIS #include #include 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 pro- cess 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_NON- BLOCK 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).