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kernel: implement FIONREAD for ttys

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monkuous
2025-11-15 23:18:10 +01:00
parent 438ef959fe
commit de3f907f25
1 changed files with 7 additions and 0 deletions
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kernel-src/io/tty.c
+7
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@@ -385,6 +385,13 @@ int tty_ioctl(tty_t *tty, unsigned long req, void *arg, int *result, cred_t *cre
size_t len = min(strlen(tty->name) + 1, TTY_NAME_MAX); size_t len = min(strlen(tty->name) + 1, TTY_NAME_MAX);
return USERCOPY_POSSIBLY_TO_USER(arg, tty->name, len); return USERCOPY_POSSIBLY_TO_USER(arg, tty->name, len);
} }
case FIONREAD: {
MUTEX_ACQUIRE(&tty->readmutex);
int count = RINGBUFFER_DATACOUNT(&tty->readbuffer);
MUTEX_RELEASE(&tty->readmutex);
int status = USERCOPY_POSSIBLY_TO_USER(arg, &count, sizeof(count));
return status;
}
default: default:
return ENOTTY; return ENOTTY;
} }