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Provides time-related structures and functions.
Since:
1.0
Version:
1.0
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Provides structures and functions related to the curren time. |
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Provides structures and functions related to the process time. |
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time (time_t *t) |
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difftime (time_t time1, time_t time2) |
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Converts the broken-down time in the tm structure into seconds. |
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strftime (char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm) |
Converts the broken-down time in the tm structure to a string in the required format. |
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gmtime (const time_t *t) |
struct tm * Converts the number of seconds to the UTC time in the tm structure. |
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localtime (const time_t *t) |
struct tm * Converts the number of seconds to the local time in the tm structure. |
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Converts the broken-down time in the tm structure into a string. |
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ctime (const time_t *timep) |
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strftime_l (char *__restrict s, size_t n, const char *__restrict f, const struct tm *__restrict tm, locale_t loc) |
Converts the broken-down time in the tm structure to a string in a specified programming language and format. |
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gmtime_r (const time_t *__restrict t, struct tm *__restrict tm) |
struct tm * Converts the number of seconds to the UTC time in the tm structure. (This function is reentrant.) |
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localtime_r (const time_t *__restrict t, struct tm *__restrict tm) |
struct tm * Converts the number of seconds to the local time in the tm structure. (This function is reentrant.) |
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asctime_r (const struct tm *__restrict tm, char *__restrict buf) |
Converts the broken-down time in the tm structure into a string. (This function is reentrant.) |
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ctime_r (const time_t *t, char *buf) |
Converts the date and time into a string. (This function is reentrant.) |
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nanosleep (const struct timespec *tspec1, struct timespec *tspec2) |
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clock_getres (clockid_t id, struct timespec *tspec) |
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clock_gettime (clockid_t id, struct timespec *tspec) |
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clock_settime (clockid_t id, const struct timespec *tspec) |
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clock_nanosleep (clockid_t id, int flag, const struct timespec *tspec1, struct timespec *tspec2) |
Pauses the current thread until a specified time of a clock arrives. |
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timer_create (clockid_t id, struct sigevent *__restrict evp, timer_t *__restrict t) |
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timer_delete (timer_t t) |
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timer_settime (timer_t t, int flags, const struct itimerspec *__restrict val, struct itimerspec *__restrict old) |
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timer_gettime (timer_t t, struct itimerspec *tspec) |
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timer_getoverrun (timer_t t) |
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Converts a time string to the broken-down time in the tm structure. |
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getdate (const char *buf) |
struct tm * Converts a time string to the broken-down time in the tm structure. |
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stime (const time_t *t) |
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Converts the broken-down time in the tm structure to the number of seconds. |
#define CLOCK_REALTIME 0
Description:
Defines the clock that runs in real time.
char* asctime (const struct [tm](tm.md) * tm)
Description:
Converts the broken-down time in the tm structure into a string.
Parameters:
| tm | Indicates the pointer to the broken-down time in the tm structure. |
Returns:
Returns the string in the format of week month day hour:minute:second year, for example, Thu Jan 1 08:00:00 1970. If the conversion fails, the program ends.
char* asctime_r (const struct [tm](tm.md) *__restrict tm, char *__restrict buf )
Description:
Converts the broken-down time in the tm structure into a string. (This function is reentrant.)
Parameters:
| tm | Indicates the pointer to the broken-down time in the tm structure. |
| buf | Indicates the pointer to the buffer for storing the string. |
Returns:
Returns the string in the format of week month day hour:minute:second year, for example, Thu Jan 1 08:00:00 1970. If the conversion fails, the program ends.
int clock_getres (clockid_t id, struct [timespec](timespec.md) * tspec )
Description:
Obtains the precision of a clock.
Parameters:
Returns:
Returns 0 if the operation is successful; returns -1 otherwise.
int clock_gettime (clockid_t id, struct [timespec](timespec.md) * tspec )
Description:
Obtains the time of a clock.
Parameters:
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int clock_nanosleep (clockid_t id, int flag, const struct [timespec](timespec.md) * tspec1, struct [timespec](timespec.md) * tspec2 )
Description:
Pauses the current thread until a specified time of a clock arrives.
A sleeping thread cannot be woken up by a signal.
Parameters:
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int clock_settime (clockid_t id, const struct [timespec](timespec.md) * tspec )
Description:
Sets the time for a clock.
Parameters:
| id | Indicates the clock ID. Only CLOCK_REALTIME is supported. |
| tspec | Indicates the pointer to the time to set. |
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
char* ctime (const time_t * timep)
Description:
Converts the date and time into a string.
Parameters:
| timep | Indicates the number of seconds to convert. |
Returns:
Returns the string in the format of week month day hour:minute:second year, for example, Thu Jan 1 08:00:00 1970. If the conversion fails, the program ends.
char* ctime_r (const time_t * t, char * buf )
Description:
Converts the date and time into a string. (This function is reentrant.)
Parameters:
| t | Indicates the pointer to the number of seconds to convert. |
| buf | Indicates the pointer to the buffer for storing the string. |
Returns:
Returns the string in the format of week month day hour:minute:second year, for example, Thu Jan 1 08:00:00 1970. If the conversion fails, the program ends.
double difftime (time_t time1, time_t time2 )
Description:
Calculates the difference between two times, in seconds.
Parameters:
| time1 | Indicates the first time. |
| time2 | Indicates the second time. |
Returns:
Returns the difference, represented using a double.
int ftime (struct [timeb](timeb.md) * tp)
Description:
Obtains the current time, accurate to milliseconds.
The time obtained is the total number of milliseconds elapsed since January 1, 1970 00:00:00 (UTC).
Parameters:
| tp | Indicates the pointer to the number of milliseconds. timezone and dstflag are set to 0. |
Returns:
Returns 0 if the operation is successful; returns -1 otherwise.
struct [tm](tm.md)* getdate (const char * buf)
Description:
Converts a time string to the broken-down time in the tm structure.
Parameters:
| buf | Indicates the pointer to the time string. The format is specified by the file defined by the environment variable DATEMSK. |
Returns:
Returns the time in the tm structure if the operation is successful; returns NULL otherwise.
struct [tm](tm.md)* gmtime (const time_t * t)
Description:
Converts the number of seconds to the UTC time in the tm structure.
Parameters:
| t | Indicates the pointer to the number of seconds to convert. |
Returns:
Returns the pointer to the UTC time in the tm structure if the conversion is successful; returns NULL and sets errno to a value in the following table if the operation fails.
struct [tm](tm.md)* gmtime_r (const time_t *__restrict t, struct [tm](tm.md) *__restrict tm )
Description:
Converts the number of seconds to the UTC time in the tm structure. (This function is reentrant.)
This function is used in the multi-task environment.
Parameters:
| t | Indicates the pointer to the number of seconds to convert. |
| tm | Indicates the pointer to the tm structure. |
Returns:
Returns the pointer to the UTC time in the tm structure if the conversion is successful; returns NULL and sets errno to a value in the following table if the operation fails.
struct [tm](tm.md)* localtime (const time_t * t)
Description:
Converts the number of seconds to the local time in the tm structure.
Parameters:
| t | Indicates the pointer to the number of seconds to convert. |
Returns:
Returns the pointer to the local time in the tm structure if the conversion is successful; returns NULL and sets errno to a value in the following table if the operation fails.
struct [tm](tm.md)* localtime_r (const time_t *__restrict t, struct [tm](tm.md) *__restrict tm )
Description:
Converts the number of seconds to the local time in the tm structure. (This function is reentrant.)
Parameters:
| t | Indicates the pointer to the number of seconds to convert. |
| tm | Indicates the pointer to the tm structure. |
Returns:
Returns the pointer to the local time in the tm structure if the conversion is successful; returns NULL and sets errno to a value in the following table if the operation fails.
time_t mktime (struct [tm](tm.md) * tm)
Description:
Converts the broken-down time in the tm structure into seconds.
Parameters:
| tm | Indicates the pointer to the broken-down time in the tm structure. |
Returns:
Returns the total number of seconds elapsed since January 1, 1970 00:00:00 (UTC) if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int nanosleep (const struct [timespec](timespec.md) * tspec1, struct [timespec](timespec.md) * tspec2 )
Description:
Pauses the current thread until a specified time arrives.
A sleeping thread cannot be woken up by a signal.
Parameters:
| tspec1 | Indicates the pointer to the minimum duration that the current thread is paused. Currently, the unit of precision is tick, and the discrepancy is fewer than 2 ticks. |
| tspec2 | This parameter is not used yet. |
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int stime (const time_t * t)
Description:
Sets the system time.
Parameters:
| t | Indicates the pointer to the number of seconds to set. |
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
size_t strftime (char *restrict s, size_t n, const char *restrict f, const struct [tm](tm.md) *restrict tm )
Description:
Converts the broken-down time in the tm structure to a string in the required format.
Parameters:
| s | Indicates the pointer to the string. |
| n | Indicates the size of the buffer for storing the string. |
| f | Indicates the pointer to the required format. |
| tm | Indicates the pointer to the broken-down time in the tm structure. |
Returns:
Returns the number of bytes in the string if the conversion is successful; returns 0 otherwise.
size_t strftime_l (char *__restrict s, size_t n, const char *__restrict f, const struct [tm](tm.md) *__restrict tm, locale_t loc )
Description:
Converts the broken-down time in the tm structure to a string in a specified programming language and format.
Parameters:
| s | Indicates the pointer to the string. |
| n | Indicates the size of the buffer for storing the string. |
| f | Indicates the pointer to the required format. |
| tm | Indicates the pointer to the broken-down time in the tm structure. |
| loc | Indicates the required programming language. Currently, only C programming language is supported. |
Returns:
Returns the number of bytes in the string if the conversion is successful; returns 0 otherwise.
char* strptime (const char * s, const char * format, struct [tm](tm.md) * tm )
Description:
Converts a time string to the broken-down time in the tm structure.
This function parses the input string s based on format and stores the result in the tm structure.
Parameters:
| s | Indicates the pointer to the string that contains only time data. |
| format | Indicates the pointer to the required format. |
| tm | Indicates the pointer to the tm structure. |
Returns:
Returns the pointer to the position to which the string has been processed (the next character to be processed) upon the conversion completion if the operation is successful; returns NULL otherwise.
time_t time (time_t * t)
Description:
Obtains the time.
The time obtained is the total number of seconds elapsed since January 1, 1970 00:00:00 (UTC).
Parameters:
| t | Indicates the pointer to the number of seconds. You can also pass NULL to use the return value. |
Returns:
Returns the number of seconds.
time_t timegm (struct [tm](tm.md) * tm)
Description:
Converts the broken-down time in the tm structure to the number of seconds.
Parameters:
| tm | Indicates the pointer to the broken-down time in the tm structure to convert. |
Returns:
Returns the number of seconds if the operation is successful; returns NULL and sets errno to a value in the following table if the operation fails.
int timer_create (clockid_t id, struct [sigevent](sigevent.md) *__restrict evp, timer_t *__restrict t )
Description:
Creates a timer for the process.
Parameters:
| id | Indicates the clock ID. Only CLOCK_REALTIME is supported. |
| evp | Indicates the pointer to the asynchronous notification signal and action, which can be NULL. |
| t | Indicates the pointer to the timer ID. |
Attention:
sigev_notify in the sigevent structure must be SIGEV_SIGNAL.
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
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The value of evp is not NULL and sigev_notify is not SIGEV_SIGNAL. |
int timer_delete (timer_t t)
Description:
Deletes a timer for the process.
Parameters:
| t | Indicates the ID of the timer to delete. |
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int timer_getoverrun (timer_t t)
Description:
Obtains the number of times that a timer overruns.
Parameters:
| t | Indicates the ID of the timer to obtain. |
Returns:
Returns the number of times if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int timer_gettime (timer_t t, struct [itimerspec](itimerspec.md) * tspec )
Description:
Obtains a timer of the process.
Parameters:
| t | Indicates the ID of the timer to obtain. |
| tspec | Indicates the pointer to the timer duration and interval. |
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
int timer_settime (timer_t t, int flags, const struct [itimerspec](itimerspec.md) *__restrict val, struct [itimerspec](itimerspec.md) *__restrict old )
Description:
Sets a timer for the process.
Parameters:
Returns:
Returns 0 if the operation is successful; returns -1 and sets errno to a value in the following table if the operation fails.
clock_t times (struct [tms](tms.md) * tm)
Description:
Obtains the number of clock ticks of the current process.
Parameters:
| tm | Indicates the pointer to the tms structure that contains the clock ticks, which can be NULL. |
Returns:
Returns the number of clock ticks of CPU 0.
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