Determine the number of characters waiting to be sent
#include <sys/dcmd_chr.h> #define DCMD_CHR_OSCHARS __DIOF(_CMD_IOCTL_TTY, 115, unsigned) /* TIOCOUTQ */
Argument | Value |
---|---|
filedes | A file descriptor that you obtained by opening the device. |
dcmd | DCMD_CHR_OSCHARS |
dev_data_ptr | A pointer to an unsigned |
n_bytes | sizeof(unsigned) |
dev_info_ptr | NULL |
This command determines the number of characters waiting to be sent. It's also implemented as the TIOCOUTQ ioctl() command.
None.
The number of characters.