isfdtype()
QNX SDP8.0C Library ReferenceAPIDeveloper
Test the file type of a file descriptor
Synopsis:
#include <sys/stat.h>
int isfdtype( int filedes,
int fdtype );
Arguments:
- filedes
- The file descriptor that you want to test.
- fdtype
- The file type that you want to test for. The valid values and the type of file that they test
for are:
- S_IFIFO — socket
- S_IFCHR — character special
- S_IFDIR — directory
- S_IFNAM — special named file
- S_IFBLK — block special
- S_IFREG — regular
- S_IFLNK — symbolic link
- S_IFSOCK — socket
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The isfdtype() function determines whether the file descriptor filedes refers to a file of the type fdtype.
Note:
This function is based on a POSIX draft; for better portability, call
fstat()
and check the buffer that it fills in:
if ((buf.st_mode & S_IFMT) == fdtype)
/* The file descriptor matches fdtype. */
else
/* The file descriptor doesn't match fdtype. */
Returns:
- 1
- The filedes file descriptor matches fdtype.
- 0
- The filedes file descriptor doesn't match fdtype.
- -1
- An error occurred (errno is set).
Errors:
Any value from the errors section in fstat().
Classification:
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | Yes |
| Thread | Yes |
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