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Write a string to a device
#include <sys/modem.h>
int modem_write( int fd,
char* str );
- fd
- The file descriptor for the device that you want to write to; see
modem_open().
- str
- The string that you want to write.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
|
This function is in libc.a, but not in libc.so
(in order to save space). |
The modem_write() function writes the string str
to the device specified by the file descriptor fd. Just before
writing each character, all buffered input from the same device
is flushed. After writing each character, an attempt to read an echo is
made. The intent is to write a string without its appearing back in the
input stream even if the device is echoing each character written.
If the \ character appears in str, then the
character following it is interpreted by modem_write(), and
instead of both being written, they're treated as a special escape
sequence that causes the following actions to be taken:
Escape |
Description |
\r
|
Output a carriage return.
|
\n
|
Output a newline.
|
\xhh
|
Output the single character whose hex representation follows
as hh.
|
\B
|
Send a 500 msec break on the line using tcsendbreak().
|
\D
|
Drop the line for 1 second using tcdropline().
|
\Phh
|
Pause for hh 1/10 of a second where hh
is two hex characters.
|
Zero on success, -1 on failure
(errno is set ).
- EAGAIN
- The O_NONBLOCK flag is set for the file descriptor, and
the process would be delayed in the write operation.
- EBADF
- The file descriptor, fildes, isn't a valid file descriptor
open for writing.
- EINTR
- The write operation was interrupted by a signal, and either no data
was transferred, or the resource manager responsible for that file doesn't
report partial transfers.
- EIO
- A physical I/O error occurred. The precise meaning depends on the device.
- EPIPE
- An attempt was made to write to a pipe (or FIFO) that isn't open for
reading by any process. A SIGPIPE signal is also sent to
the process.
QNX Neutrino
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
modem_open(),
modem_read(),
modem_script()
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