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authorMattias Andrée <maandree@kth.se>2019-10-22 16:43:36 +0200
committerMattias Andrée <maandree@kth.se>2019-10-22 16:43:36 +0200
commit82571a9f052608484db10ad04fb9d0665e0fafd3 (patch)
tree03722f1be83de4af925934468707572b40beb327 /src/sleep-until.c
parentadd rationale to readme (diff)
downloadsleep-until-2.tar.gz
sleep-until-2.tar.bz2
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Change license, change style, remove info manual, flat dir hier2
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'src/sleep-until.c')
-rw-r--r--src/sleep-until.c131
1 files changed, 0 insertions, 131 deletions
diff --git a/src/sleep-until.c b/src/sleep-until.c
deleted file mode 100644
index e06b552..0000000
--- a/src/sleep-until.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/**
- * sleep-until – Sleeps until a specified time
- *
- * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <sys/timerfd.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <errno.h>
-
-
-int main(int argc, char* argv[])
-{
- char* argv0;
- char float_part[10];
- struct itimerspec value;
- struct itimerspec largest_value;
- int i, fd = -1, clocks = 0;
- uint64_t _expirations;
- int clockid = CLOCK_REALTIME;
- const char* clockstr = "CLOCK_REALTIME";
-
- if (argc < 2)
- return 0;
-
- argv0 = argv[0];
- argc--, argv++;
-
- memset(&value, 0, sizeof(value));
- float_part[9] = '\0';
- for (i = 0; i < argc; i++)
- {
- char* p1 = argv[i];
- char* p2;
- char excess;
- size_t len;
-
- if (strstr(p1, "CLOCK_") != p1)
- goto parse_time;
-$>cat /usr/include/bits/time.h | grep '^ *# *define *CLOCK_' | grep -Po 'CLOCK_[^[:blank:]]*' |
-$>while read c; do
- else if (!strcmp(p1, "${c}"))
- clockid = ${c}, clockstr = "${c}";
-$>done
- else
- clockid = -1, clockstr = "invalid";
- clocks++;
- continue;
-
- parse_time:
- if ((p2 = strchr(p1, '.')))
- *p2++ = '\0';
-
- value.it_value.tv_sec = (time_t)atoll(p1);
-
- if (p2)
- {
- len = strlen(p2);
- memset(float_part, '0', 9 * sizeof(char));
- excess = len > 9 ? p2[9] : '0';
- len = len > 9 ? 9 : len;
- memcpy(float_part + 9 - len, p2, len * sizeof(char));
- value.it_value.tv_nsec = atol(float_part);
- if ((excess >= '5') && (value.it_value.tv_nsec++ == 999999999L))
- value.it_value.tv_nsec = 0, value.it_value.tv_sec++;
- }
-
- if (i == clocks)
- largest_value = value;
- else if (value.it_value.tv_sec > largest_value.it_value.tv_sec)
- largest_value = value;
- else if (value.it_value.tv_sec == largest_value.it_value.tv_sec)
- if (value.it_value.tv_nsec > largest_value.it_value.tv_nsec)
- largest_value = value;
- }
-
- if (clocks == argc)
- return 0;
-
- fd = timerfd_create(clockid, 0);
- if (fd < 0)
- goto fail;
- if (timerfd_settime(fd, TFD_TIMER_ABSTIME, &largest_value, NULL))
- goto fail;
-
- if (clock_gettime(clockid, &(value.it_value)) == 0)
- fprintf(stderr, "%s: sleeping until %lli.%09li (current time: %lli.%09li, clock: %s)\n",
- argv0, (long long int)(largest_value.it_value.tv_sec), largest_value.it_value.tv_nsec,
- (long long int)(value.it_value.tv_sec), value.it_value.tv_nsec, clockstr);
-
- for (;;)
- {
- if (clock_gettime(clockid, &(value.it_value)))
- goto fail;
- if (value.it_value.tv_sec > largest_value.it_value.tv_sec)
- break;
- if (value.it_value.tv_sec == largest_value.it_value.tv_sec)
- if (value.it_value.tv_nsec >= largest_value.it_value.tv_nsec)
- break;
- if (read(fd, &_expirations, (size_t)8) < 8)
- {
- if (errno == EINTR)
- continue;
- goto fail;
- }
- }
-
- close(fd);
- return 0;
- fail:
- perror(argv0);
- if (fd >= 0) close(fd);
- return 1;
-}
-