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Why can't I use conio.h functions like clrsrc? Because conio.h is not part of the C standard. It is a Borland extension, and works only with Borland compilers (and perhaps some other commercial compilers). Dev-C uses GCC, the GNU Compiler Collection, as it's compiler. GCC is originally a UNIX compiler, and aims for portability and standards. The following header files are present in the sys subdirectory. Their presence in this directory indicates that they are system-dependent header files. Sys/audio.h This header file defines macros and types for use with audio. Sys/cdrom.h This header file contains definitions for use with CD ROMs.
Jun 03, 2017 Prerequisite: Fork System call A call to wait blocks the calling process until one of its child processes exits or a signal is received. After child process terminates, parent continues its execution after wait system call instruction. Child process may terminate due to any of these.
- The C Standard Library
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- C Standard Library Resources
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The time.h header defines four variable types, two macro and various functions for manipulating date and time.
Library Variables
Following are the variable types defined in the header time.h −
| Sr.No. | Variable & Description |
|---|---|
| 1 | size_t This is the unsigned integral type and is the result of the sizeof keyword. |
| 2 | clock_t This is a type suitable for storing the processor time. |
| 3 | time_t is This is a type suitable for storing the calendar time. |
| 4 | struct tm This is a structure used to hold the time and date. |
The tm structure has the following definition −
Library Macros
Following are the macros defined in the header time.h −
| Sr.No. | Macro & Description |
|---|---|
| 1 | NULL This macro is the value of a null pointer constant. |
| 2 | CLOCKS_PER_SEC This macro represents the number of processor clocks per second. |
Library Functions
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Following are the functions defined in the header time.h −
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| Sr.No. | Function & Description |
|---|---|
| 1 | char *asctime(const struct tm *timeptr) Returns a pointer to a string which represents the day and time of the structure timeptr. |
| 2 | clock_t clock(void) Returns the processor clock time used since the beginning of an implementation defined era (normally the beginning of the program). |
| 3 | char *ctime(const time_t *timer) Returns a string representing the localtime based on the argument timer. |
| 4 | double difftime(time_t time1, time_t time2) Returns the difference of seconds between time1 and time2 (time1-time2). |
| 5 | struct tm *gmtime(const time_t *timer) The value of timer is broken up into the structure tm and expressed in Coordinated Universal Time (UTC) also known as Greenwich Mean Time (GMT). |
| 6 | struct tm *localtime(const time_t *timer) The value of timer is broken up into the structure tm and expressed in the local time zone. |
| 7 | time_t mktime(struct tm *timeptr) Converts the structure pointed to by timeptr into a time_t value according to the local time zone. |
| 8 | size_t strftime(char *str, size_t maxsize, const char *format, const struct tm *timeptr) Formats the time represented in the structure timeptr according to the formatting rules defined in format and stored into str. |
| 9 | time_t time(time_t *timer) Calculates the current calender time and encodes it into time_t format. |