07-05-2006
Making a system call
This is a total nooby question, but here goes...
I am trying to do something in C for the very first time, and doing it in Solaris, for the very first time. It would otherwise be easy enough to test out and find out, but I wont be able to do so until the week after next for various reasons, so I was just wondering if this would work...
I am replacing a script file with C code. The script starts out such as:
#!/bin/ksh
export BUILD_DIR=`cat /nssn/cm/current_build`
export HOSTNAME=`hostname`
echo ColdStart>$BUILD_DIR/logs/StartType
etc...
so, can I just replace that with system calls such as:
system("#!/bin/ksh");
system("export BUILD_DIR=`cat /nssn/cm/current_build`");
system("export HOSTNAME=`hostname`");
etc...
At first I thought yes but then I wondered, does each system call sort of call in a different shell? If so, would the environment variable defined in one system call be seen from another system call?
If that is a problem, is there any way to do all of the system calls in a single system call?
Help a noob out...and thanks for any help in advance!!!
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LEARN ABOUT CENTOS
papi_ipc
PAPI_ipc(3) PAPI PAPI_ipc(3)
NAME
PAPI_ipc -
Simplified call to get instructions per cycle, real and processor time.
SYNOPSIS
Detailed Description
C Interface:
#include <papi.h>
int PAPI_ipc( float *rtime, float *ptime, long long *ins, float *ipc );
Parameters:
*rtime total realtime since the first call
*ptime total process time since the first call
*ins total instructions since the first call
*ipc incremental instructions per cycle since the last call
Return values:
PAPI_EINVAL The counters were already started by something other than PAPI_ipc().
PAPI_ENOEVNT The floating point operations event does not exist.
PAPI_ENOMEM Insufficient memory to complete the operation.
The first call to PAPI_ipc() will initialize the PAPI High Level interface, set up the counters to monitor PAPI_TOT_INS and PAPI_TOT_CYC
events and start the counters.
Subsequent calls will read the counters and return total real time, total process time, total instructions since the start of the
measurement and the IPC rate since the latest call to PAPI_ipc().
A call to PAPI_stop_counters() will stop the counters from running and then calls such as PAPI_start_counters() or other rate calls can
safely be used.
PAPI_ipc should return a ratio greater than 1.0, indicating instruction level parallelism within the chip. The larger this ratio the more
effeciently the program is running.
See Also:
PAPI_flips()
PAPI_flops()
PAPI_epc()
PAPI_stop_counters()
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_ipc(3)