58 lines
No EOL
1.8 KiB
C
58 lines
No EOL
1.8 KiB
C
/** Time related functions.
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*
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2015, Steffen Vogel
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* @license GPLv3
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*********************************************************************************/
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#ifndef _TIME_H_
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#define _TIME_H_
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#define _POSIX_C_SOURCE 199309L
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#include <unistd.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <time.h>
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#include <sys/timerfd.h>
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/** Wait until timer elapsed
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*
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* @param fd A file descriptor which was created by timerfd_create(3).
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* @retval 0 An error occured. Maybe the timer was stopped.
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* @retval >0 The nummer of runs this timer already fired.
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*/
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uint64_t timerfd_wait(int fd);
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/** Wait until a fixed time in the future is reached
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*
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* @param fd A file descriptor which was created by timerfd_create(3).
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* @param until A pointer to a time in the future.
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* @retval 0 An error occured. Maybe the timer was stopped.
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* @retval >0 The nummer of runs this timer already fired.
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*/
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uint64_t timerfd_wait_until(int fd, struct timespec *until);
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/** Get delta between two timespec structs */
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struct timespec time_diff(struct timespec *start, struct timespec *end);
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/** Get sum of two timespec structs */
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struct timespec time_add(struct timespec *start, struct timespec *end);
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/** Return the diffrence off two timestamps as double value in seconds. */
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double time_delta(struct timespec *start, struct timespec *end);
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/** Convert timespec to double value representing seconds */
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double time_to_double(struct timespec *ts);
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/** Convert double containing seconds after 1970 to timespec. */
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struct timespec time_from_double(double secs);
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/** Read a timestamp from a file with the format: "secs.nanosecs\t" */
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int time_fscan(FILE *f, struct timespec *ts);
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/** Write a timestamp to a file with the format: "secs.nanosecs\t" */
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int time_fprint(FILE *f, struct timespec *ts);
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#endif |