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hurd TIOCFLUSH: Cope BSD 4.1 semantic

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BSD 4.1 did not have an argument for TIOCFLUSH, BSD 4.2 added it. There
are still a lot of applications out there that pass a NULL argument to
TIOCFLUSH, so we should rather cope with it.
This commit is contained in:
Samuel Thibault 2021-02-01 19:39:48 +01:00
parent d5c8f98c5e
commit 36231bee7a
1 changed files with 4 additions and 0 deletions
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4
sysdeps/mach/hurd/ioctl.c
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@ -113,6 +113,10 @@ __ioctl (int fd, unsigned long int request, ...)
/* We don't want to advance ARG since it will be used to copy out
too if IOC_OUT is also set. */
void *argptr = arg;
int zero = 0;
if (request == TIOCFLUSH && !arg)
arg = &zero;
/* Pack an argument into the message buffer. */
void in (unsigned int count, enum __ioctl_datum type)