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Programming
Client - server program
Post 302089133 by Sharmin on Sunday 17th of September 2006 12:56:59 PM
09-17-2006
Hello
Quote:
Originally Posted by matrixmadhan
what is the post that you are referring to ?
is that from some other thread ???
is that from some other thread ???
Hello,
thank you. You all ready gave me answer about the extracting string and then printing it out. I thought that noone saw it.
At future, I will wait for a long time, before asking again. My question was how to extract a specific string from a file with sscanf( ) and then printing it out.
I got the answer. But now I wonder whether it is possible to extract more than one string from more than one line from a file. Say, we have a file,
cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Celeron(R) CPU 2.60GHz
stepping : 9
cpu MHz : 2591.654
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse
And I want to extract
vendor_id : GenuineIntel
model : 2
model name : Intel(R) Celeron(R) CPU 2.60GHz
I know that it is possible by wrting the following code three times in this case as we are extracting three strings here.
if(NULL == (fp = fopen(argv[1], "rt"))){
printf("Can't open %s\n", argv[1]);
exit(1);
}
for(;fgets(buf, 255, fp)
{if(buf == strstr(buf, "model name")){
if(NULL != (p = strchr(buf, ':')))
printf("%s\n", p + 1);
break;
}
But is there a way, for which I can write the code once but can extract some specific strings and print them out at once one after the other.
And also, is there a way, so that in one C file I can open mutiple files by command line argument, one after the other. Say, after I am done with printing vendor_id, model type, and model name from cpuinfo file from /proc directory, I open the stat file from the /proc directory and start extracting some specific strings and printing them again. Is that a very compilcated way or much simple. Please let me know how to do that if you know.
And also, when we extract a string, say, cpu family : 15, 15 is a type string. Say, I want to convert string 15 to an integer; so, I use atoi(), but to print it, I have to do the following right?
int number = atoi(p);
printf("The integer value is: %d\n", number);
But well I cannot print the integer value. So, I think I am missing something.
Whatever help I can get, I will be very thankful.
Thank you.
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LEARN ABOUT SUSE
cpuid
CPUID(4) Linux Programmer's Manual CPUID(4) NAME
cpuid - x86 CPUID access device DESCRIPTION
CPUID provides an interface for querying information about the x86 CPU. This device is accessed by lseek (2) or pread (2) to the appropriate CPUID level and reading in chunks of 16 bytes. A larger read size means multiple reads of consecutive levels. The lower 32 bits of the file position is used as the incoming %eax, and the upper 32 bits of the file position as the incoming %ecx, the latter intended for "counting" eax levels like eax=4. This driver uses /dev/cpu/CPUNUM/cpuid, where CPUNUM is the minor number, and on an SMP box will direct the access to CPU CPUNUM as listed in /proc/cpuinfo. This file is protected so that it can only be read by the user root, or members of the group root. NOTES
The CPUID instruction can be directly executed by a program using inline assembler. However this device allows convenient access to all CPUs without changing process affinity. Most of the information in cpuid is reported by the kernel in cooked form either in /proc/cpuinfo or through subdirectories in /sys/devices/system/cpu. Direct CPUID access through this device should only be used in exceptional cases. The cpuid driver is not auto-loaded. On modular kernels you might need to use the following command to load it explicitly before use: $ modprobe cpuid There is no support for CPUID functions that require additional input registers. Very old x86 CPUs don't support CPUID. SEE ALSO
Intel Corporation, Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, 3-180 CPUID ref- erence. Intel Corporation, Intel Processor Identification and the CPUID Instruction, Application note 485. COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2009-03-31 CPUID(4)