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nanosleep: clear remainder on successful completion

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Also switch to doing everything in terms of struct timespec except
for the actual select(2) call.
This commit is contained in:
Todd C. Miller
2023-03-15 13:50:33 -06:00
parent 3f5e7df3cd
commit 708cdc61ba
1 changed files with 25 additions and 16 deletions
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39
lib/util/nanosleep.c
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@@ -1,7 +1,8 @@
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2011, 2013, 2017-2018 Todd C. Miller <Todd.Miller@sudo.ws>
* Copyright (c) 2009-2011, 2013, 2017-2018, 2023
* Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -37,28 +38,36 @@
#include "sudo_util.h"
int
sudo_nanosleep(const struct timespec *ts, struct timespec *rts)
sudo_nanosleep(const struct timespec *timeout, struct timespec *remainder)
{
struct timeval timeout, endtime, now;
struct timespec endtime, now;
struct timeval tv;
int rval;
if (ts->tv_sec == 0 && ts->tv_nsec < 1000) {
timeout.tv_sec = 0;
timeout.tv_usec = 1;
if (timeout->tv_sec == 0 && timeout->tv_nsec < 1000) {
tv.tv_sec = 0;
tv.tv_usec = 1;
} else {
TIMESPEC_TO_TIMEVAL(&timeout, ts);
TIMESPEC_TO_TIMEVAL(&tv, timeout);
}
if (rts != NULL) {
if (gettimeofday(&endtime, NULL) == -1)
if (remainder != NULL) {
if (sudo_gettime_real(&endtime) == -1)
return -1;
sudo_timevaladd(&endtime, &timeout, &endtime);
sudo_timespecadd(&endtime, timeout, &endtime);
}
rval = select(0, NULL, NULL, NULL, &timeout);
if (rts != NULL && rval == -1 && errno == EINTR) {
if (gettimeofday(&now, NULL) == -1)
rval = select(0, NULL, NULL, NULL, &tv);
if (remainder != NULL) {
if (rval == 0) {
/* Timeout expired, no remaining time. */
sudo_timespecclear(remainder);
} else if (errno == EINTR) {
/* Interrupted, compute remaining time. */
if (sudo_gettime_real(&now) == -1)
return -1;
sudo_timevalsub(&endtime, &now, &endtime);
TIMEVAL_TO_TIMESPEC(&endtime, rts);
sudo_timespecsub(&endtime, &now, remainder);
if (remainder->tv_sec < 0 || remainder->tv_nsec < 0)
sudo_timespecclear(remainder);
}
}
return rval;
}