vdprintf()
QNX SDP8.0C Library ReferenceAPIDeveloper
Write output to a file associated with a file descriptor (varargs)
Synopsis:
#include <stdio.h>
#include <stdarg.h>
int vdprintf( int filedes,
const char* format,
va_list arg );
Arguments:
- filedes
- A file descriptor that's associated with the file where you want to send the output.
- format
- A string that specifies the format of the output. The formatting string determines what additional arguments you need to provide. For more information, see printf().
- arg
- A variable-argument list of the additional arguments, which you must have initialized with the va_start() macro.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The vdprintf() function writes output to the file associated with the file descriptor filedes, under control of the format specifier.
The vdprintf() function is a varargs
version of
dprintf().
Returns:
The number of characters written, or a negative value if an output error occurred (errno is set).
Classification:
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | Yes |
| Thread | Yes |
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