fdes_to_drivername - determine the driver name for the device
char * fdes_to_drivername (int fd, char *buf, int *length);
fdes_to_drivername is useful to determine the name of the driver handling
the device corresponding to the special file descriptor. Note that this
file descriptor can correspond to any of the different alias names for
The fdes_to_drivername function provides a way to retrieve the name of
the driver handling the device corresponding to the special file
fd identifies the device, buf is the placeholder for the driver name and
length is an input/output argument that on the call to fdes_to_drivername
should contain the maximum size of the name the process is willing to
accept. On return, the length will have been modified to show the actual
size of the driver name returned.
fdes_to_drivername will fail if one or more of the following are true:
The driver name is too large to fit into the buffer. The integer
that the valuelength argument points to has been modified to show
the actual number of bytes that would be required to store the value
of that attribute.
Fd does not refer to a valid descriptor.
The effective user ID does not match the owner of the file and the
effective user ID is not super-user.
Buf, or length points outside the allocated address space of the
Upon successful completion, the name is returned. Otherwise, a value of
NULL is returned and errno is set to indicate the error.
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