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hurd: Simplify usleep timeout computation 

as suggested by Andreas Schwab

* sysdeps/mach/usleep.c (usleep): Divide timeout in an overflow-safe way.
This commit is contained in:
Samuel Thibault 2020-06-29 10:09:14 +02:00
parent 269e4c17cd
commit 81b1c8cbb5
1 changed files with 2 additions and 5 deletions
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7
sysdeps/mach/usleep.c
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@ -27,16 +27,13 @@ usleep (useconds_t useconds)
{
mach_port_t recv;
int cancel_oldtype;
useconds_t useconds_up = useconds + 999;
if (useconds_up < useconds)
useconds_up = UINT32_MAX;
mach_msg_timeout_t timeout = useconds / 1000 + (useconds % 1000 != 0);
recv = __mach_reply_port ();
cancel_oldtype = LIBC_CANCEL_ASYNC();
(void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
0, 0, recv, useconds_up / 1000, MACH_PORT_NULL);
0, 0, recv, timeout, MACH_PORT_NULL);
LIBC_CANCEL_RESET (cancel_oldtype);
__mach_port_destroy (mach_task_self (), recv);