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Full Discussion: sco unix 5.0.5 call sytem() function question!please help me!
Top Forums Programming sco unix 5.0.5 call sytem() function question!please help me! Post 21498 by hit on Friday 17th of May 2002 02:37:13 AM
Old 05-17-2002
Question it is not right through judging the errno values
thanks for your advice,but it is not right through judging the errno values,
example:
#include <stdio.h>
#include <errno.h>
main()
{
int ret;
char cmd[128];
strcpy(cmd,"compress /tmp/lll");

ret = system(cmd);
printf("after system errno[%d], ret[%d]\n", errno, ret);
exit(0);
}
if the fileˇ°/tmp/lllˇ± doesnot exist,execute this program,screen will
output:
compress: could not read /tmp/lll: No such file or directory (error 2)
after system errno[0], ret[256]
errno only represents the result of calling system function,not the result of the command (compress).

#include <stdio.h>
#include <errno.h>
main()
{
int ret;
char cmd[128];
strcpy(cmd,"compress /tmp/lll");

ret = system(cmd);
/* add this sentence"/
ret >>= 8
printf("after system errno[%d], ret[%d]\n", errno, ret);
if ( ret == 0 )
printf("compress success\n");
else
printf("compress failure\n");
exit(0);
}

is it right to judge whether the file compress is success though the ret >>= 8;
 

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LEARN ABOUT CENTOS

papi_start

PAPI_start(3)							       PAPI							     PAPI_start(3)

NAME

       PAPI_start -

       Start counting hardware events in an event set.

SYNOPSIS

Detailed Description
       C Interface:
	   #include <papi.h>
	    int PAPI_start( int  EventSet );

       Parameters:
	   EventSet -- an integer handle for a PAPI event set as created by PAPI_create_eventset

       Return values:
	   PAPI_OK
	   PAPI_EINVAL -- One or more of the arguments is invalid.
	   PAPI_ESYS -- A system or C library call failed inside PAPI, see the errno variable.
	   PAPI_ENOEVST -- The EventSet specified does not exist.
	   PAPI_EISRUN -- The EventSet is currently counting events.
	   PAPI_ECNFLCT -- The underlying counter hardware can not count this event and other events in the EventSet simultaneously.
	   PAPI_ENOEVNT -- The PAPI preset is not available on the underlying hardware.

       PAPI_start starts counting all of the hardware events contained in the previously defined EventSet. All counters are implicitly set to zero
       before counting. Assumes an initialized PAPI library and a properly added event set.

       Example:

	   *  int EventSet = PAPI_NULL;
	   *  long long values[2];
	   *  int ret;
	   *
	   *  ret = PAPI_create_eventset(&EventSet);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *
	   *  // Add Total Instructions Executed to our EventSet
	   *  ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *
	   *  // Start counting
	   *  ret = PAPI_start(EventSet);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *  poorly_tuned_function();
	   *  ret = PAPI_stop(EventSet, values);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *  printf("%lld
",values[0]);
	   *

       See Also:
	   PAPI_create_eventset PAPI_add_event PAPI_stop

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014						     PAPI_start(3)
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