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Full Discussion: C Compilation problem
Top Forums Programming C Compilation problem Post 302361690 by on9west on Wednesday 14th of October 2009 12:07:47 AM
Old 10-14-2009
C Compilation problem

Dear all

I am new to C programming

In response to the post

cat get_time.c
Code:
#include <stdlib.h>
#include <sys/time.h>
main()
{
     struct timeval tv;
     struct timezone tz;
     struct tm *tm;
     gettimeofday(&tv, &tz);
     tm=localtime(&tv.tv_sec);
     printf(" %d:%02d:%02d %d \n", tm->tm_hour, tm->tm_min,
              m->tm_sec, tv.tv_usec);
     exit(0);
}

gcc get_time.c
Code:
get_time.c: In function `main':
get_time.c:9: warning: assignment makes pointer from integer without a cast
get_time.c:10: error: dereferencing pointer to incomplete type
get_time.c:10: error: dereferencing pointer to incomplete type
get_time.c:11: error: `m' undeclared (first use in this function)
get_time.c:11: error: (Each undeclared identifier is reported only once
get_time.c:11: error: for each function it appears in.)

I am new to C....and really no idea. Please hint me for that.

Many thanks
Valentino
 

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GETTIMEOFDAY(2) 						System Calls Manual						   GETTIMEOFDAY(2)

NAME
gettimeofday, settimeofday - get/set date and time SYNOPSIS
#include <sys/time.h> gettimeofday(tp, tzp) struct timeval *tp; struct timezone *tzp; settimeofday(tp, tzp) struct timeval *tp; struct timezone *tzp; DESCRIPTION
The system's notion of the current Greenwich time and the current time zone is obtained with the gettimeofday call, and set with the set- timeofday call. The time is expressed in seconds and microseconds since midnight (0 hour), January 1, 1970. The resolution of the system clock is hardware dependent, and the time may be updated continuously or in ``ticks.'' If tzp is zero, the time zone information will not be returned or set. The structures pointed to by tp and tzp are defined in <sys/time.h> as: struct timeval { long tv_sec; /* seconds since Jan. 1, 1970 */ long tv_usec; /* and microseconds */ }; struct timezone { int tz_minuteswest; /* of Greenwich */ int tz_dsttime; /* type of dst correction to apply */ }; The timezone structure indicates the local time zone (measured in minutes of time westward from Greenwich), and a flag that, if nonzero, indicates that Daylight Saving time applies locally during the appropriate part of the year. Only the super-user may set the time of day or time zone. RETURN
A 0 return value indicates that the call succeeded. A -1 return value indicates an error occurred, and in this case an error code is stored into the global variable errno. ERRORS
The following error codes may be set in errno: [EFAULT] An argument address referenced invalid memory. [EPERM] A user other than the super-user attempted to set the time. SEE ALSO
date(1), adjtime(2), ctime(3), timed(8) 4th Berkeley Distribution May 14, 1986 GETTIMEOFDAY(2)
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