Scroll Down to See All▾

abort abs acos asctime asin assert atan atan2 atexit atof atoi atol bsearch btowc calloc catclose catgets catopen ceil clearerr clock cos cosh ctime ctime_r difftime div erf erfc exit exp fabs fclose fdopen feof ferror fflush fgetc fgetpos fgets fgetwc fgetws fopen fprintf fputc fputws fread free freopen frexp fscanf fseek fsetpos ftell fwide fwprintf fwrite fwscanf getc getchar getenv getwc getwchar gmtime gmtime_r hypot isalnum isalpha isascii isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit j0 j1 jn labs ldexp ldiv localeconv localtime localtime_r log log10 longjmp malloc mblen mbrlen mbrtowc mbsinit mbsrtowcs mbstowcs mbtowc memchr memcmp memcpy memmove memset mktime modf nextafter nextafterl nexttoward nexttowardl nl_langinfo perror pow printf putc putchar putenv puts putwc putwchar qsort quantexpd32 quantexpd64 quantexpd128 quantized32 quantized64 quantized128 samequantumd32 raise rand rand_r realloc regcomp regerror regexec regfree remove rename rewind scanf setbuf setjmp setlocale setvbuf signal sin sinh snprintf sprintf sqrt srand sscanf strcasecmp strcat strchr strcmp strcoll strcpy strcspn strerror strfmon strftime strlen strncasecmp strncat strncmp strncpy strpbrk strptime strrchr strspn strstr strtod strtod32 strtod64 strtod128 strtof strtok strtok_r strtol strtold strtoul strxfrm swprintf swscanf system tan tanh time time64 tmpfile tmpnam toascii tolower toupper towctrans towlower towupper ungetc ungetwc va_arg va_copy va_end va_start vfprintf vfscanf vfwprintf vfwscanf vprintf vscanf vsprintf vsnprintf vsscanf vswprintf vswscanf vwprintf vwscanf wcrtomb wcscat wcschr wcscmp wcscoll wcscpy wcscpy wcsftime wcslen wcsncat wcsncmp wcsncpy wcspbrk wcsptime wcsrchr wcsrtombs wcsspn wcsstr wcstod wcstod32 wcstod64 wcstod128 wcstof wcstok wcstol wcstold wcstombs wcstoul wcsxfrm wctob wctomb wctrans wctype wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset wprintf wscanf y0 y1 yn

Function Details : asctime_r

char *asctime_r(const struct tm * timeptr,char * buffer) ;

Return Type : char *

String pointer (array of characters)

Read about return values of asctime_r function .

1st Parameter Type : const struct tm *

Pointer to a constant `struct tm`, which represents broken-down time values including year, month, day, hour, minute, and second.

1st Parameter

Pointer to a `struct tm` representing broken-down time

2nd Parameter Type : char *

String pointer (array of characters)

2nd Parameter

Pointer to a user-supplied buffer to store the resulting string

Read more about parameters of asctime_r in parameters section

The asctime_rfunction in C language Thread-safe version of asctime.

The asctime_r function is a thread-safe version of asctime. It converts a time structure (struct tm) to a string representation and stores the result in a user-provided buffer. This function is reentrant and can be used safely in multi-threaded programs. The resulting string has the form 'Day Mon dd hh:mm:ss yyyy\n'.

The asctime_rfunction takes 2 parameters:

•
const struct tm * `timeptr`: Pointer to a `struct tm` representing broken-down time
•
char * `buffer`: Pointer to a user-supplied buffer to store the resulting string

The asctime_r function return value :

Returns a pointer to the string result if successful, or NULL if an error occurred

Output

This example demonstrates the basic usage of the `asctime_r` function to convert the current local time to a string representation in a thread-safe manner.