compile a c program


 
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# 1  
Old 02-21-2008
compile a c program

I am trying to compile a c program on AIX 5.3L 64-bit unix.

I have used this program in the past and it works.

Does anybody know what this error means?

/usr/local/bin> gcc get_epoch_secs.c get_epoch_secs

gcc: get_epoch_secs: No such file or directory
get_epoch_secs.c: In function 'main':
get_epoch_secs.c:13: warning: return type of 'main' is not 'int'

thanks.
# 2  
Old 02-21-2008
Code:
/usr/local/bin> gcc get_epoch_secs.c -o get_epoch_secs

And on line 13 of main() in your code you have a return statement - it should read
Code:
return 0;

# 3  
Old 02-21-2008
Ok, no matter where it put it I get the same reply.

/*
Listing 5 get_epoch_secs.c
get_epoch_secs.c
return the number of seconds from the Epoch
*/
#include <stdio.h>
#include <time.h>

void main(argc, argv)
int argc;
char **argv;
{
time_t tloc;

printf("%ld", time(&tloc));
}



Where should it go?


thanks.
# 4  
Old 02-21-2008
You probably need to get rid of the 'void' in front of the main() function. Try using int main()... or just main()...
# 5  
Old 02-22-2008
one more

One more compile. I have not worked with these programs in a couple of years. This is is giving the error below. If I change to

main
int main
void main

it does not seem to help.


"get_date_from_secs.c" 44 lines, 834 characters
/*
Listing 6 get_date_from_secs.c
get_date_from_secs.c
pass the number of seconds since
the Epoch, and return a Gregorian
date argument
use "%02d" date format.

*/
#include <stdio.h>
#include <time.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
char *secarg;
struct tm rettm;
time_t now;

/* grab the first argument, time in seconds */
if((secarg = *++argv) == NULL)
{ /* error */
printf("-1");
exit(1);
}
else
{
if((now=atol(secarg)) == NULL)
{ /* error */
printf("-2");
exit(1);
}
else
{
rettm=*localtime(&now);
/*printf("%s", asctime(&rettm));*/
/*printf("%2d/%d/%d", rettm.tm_mon+1, rettm.tm_mday, rettm.tm_year+1900);*/
printf("%02d%02d%02d%02d", rettm.tm_mon+1, rettm.tm_mday, rettm.tm_hour, rettm.tm_min);


/usr/local/bin> gcc get_date_from_secs.c -o get_date_from_secs
get_date_from_secs.c: In function 'main':
get_date_from_secs.c:28: warning: comparison between pointer and integer
# 6  
Old 02-22-2008
It was easier to rewrite this than to explain the problems.
Code:
/*
Listing 6 get_date_from_secs.c
get_date_from_secs.c
pass the number of seconds since
the Epoch, and return a Gregorian
date argument
use "%02d" date format.

*/
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>

int main(int argc, char **argv)
{
	struct tm *rettm;  /* use a pointer */
	time_t now=time(NULL);  /* add a value to now */
	char timebuf[128]={0x0}; /* place to park date time values */

	/* grab the first argument, time in seconds Note:  will segfault the old way*/
	if(argc < 2)   /* argc has to be > 1 */
	{ /* error */
		fprintf(stderr, "bad arguments -1\n"); /* you can also user perror() here */
		exit(1);
	}
	/* zero is a valid number and is valid for epoch seconds */
	errno=0;  /* set errno to a known state */
	if((now=atol(argv[1])) == 0 && errno !=0) /* atol never returns a NULL use argv */
	{ /* error */
	  /* you get to add errno checking here */
		fprintf(stderr,"invalid conversion -2\n"); /* you can also user perror() here */
		exit(1);
	}
	rettm=localtime(&now);  /* you can check for a NULL return here if you want */
	/* check your man page - some implementations only allow struct tm > Dec 13 20:45:52 UTC 1901. */
	/* use std library for time/date  use strftime */

	printf("%02d%02d%02d%02d\n", rettm->tm_mon+1, rettm->tm_mday, rettm->tm_hour, rettm->tm_min);
	strftime(timebuf, sizeof(timebuf),"%m %d %H %M %S", rettm);
	printf("%s\n", timebuf);

    return 0;
}

# 7  
Old 02-22-2008
compile

Thank you!

I have not used these for 2-3 years.

I call them from a shell script that gets the last trace file and sends me the first 100 lines.
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