NULL is defined to be<datatype> *)0 - this means regardless of the underlying architecture
if p == 0 and p is a pointer it is guaranteed to be unassigned. Therefore
Code:
if (p)
if(p==NULL)
evaluate the same. NULL is fairly new. Old C code uses code like (char**)0 all the time. Example - this is in the strtoul definition on the manpage for systems that have C89 compilers.
hi
I wrote the following makefile, I have just one problem, when i type make clean I get the message make 'clean' is up to date and any obj file is removed from my folder, what's wrong?
Thank you
CC = cc
all: es.o elaboration.o
$(CC) -o es es.o elaboration.o
elaboration.o:... (0 Replies)
08-18-2008 11:00 AM
Cluster computing has played a pivotal role in the way research is conducted in educational environments. Because the amount of available money and hardware varies between university researchers, often it's necessary to find a clustering solution that can work well on a small... (0 Replies)
I'm running the following rsync command to sync a directory between the 2 servers:
rsync -az --delete --stats /some_dir/ server_name:/some_dir
I'm getting the following output:
Number of files: 655174
Number of files transferred: 14221
Total file size: 1138531979331 bytes
Total... (0 Replies)
It's been a while since I had to write a Makefile, but I've managed to clobber this together:
SRC=module1.c module2.c
OBJS=$(SRC:%.c=%.o)
HDR=include1.h include2.h
CC=gcc
CFLAGS=-Wall -ggdb -D_XOPEN_SOURCE -I. -ansi
all: program
program: $(OBJS)
$(CC) $(CFLAGS) -o $@ $(OBJS)
... (3 Replies)
Can someone explain the correlation between how sar names the disk drives and how the rest of the OS names the disk drives?
sar lists my disk drives as sd0, sd1, sd2, etc.....
while format lists my disk drives as c1t0d0, c1t1d0, c1t2d0,etc...
And also why sar shows 8 disks but format... (2 Replies)
I stumbled upon this thread and one aspect of it got me thinking. As i am building a small Linux network right now for a friend i would like to hear your opinion on this.
I'd like to respectfully disagree. I think the Linux habit of disabling root login per default is wrong (not entirely... (6 Replies)
I'm trying to send the file list as parameter to another job and execute it.
But the loop doesn't work, the inner job is running only once and not twice as expected
for filelist in $(ls -rt *.txt | tail -2)
do
echo $filelist
export filelist
cmd="$Program -config $configfile -autoexec... (11 Replies)
We have several dozen Redhat 5, 6 and 7 servers that are running Oracle databases. On some databases we are using automatic memory management, which uses shared memory. On other databases we are use manual memory management, which does not use shared memory.
When I see that a server is swapping... (2 Replies)
Discussion started by: gandolf989
2 Replies
LEARN ABOUT CENTOS
papi_strerror
PAPI_strerror(3) PAPI PAPI_strerror(3)NAME
PAPI_strerror -
Returns a string describing the PAPI error code.
SYNOPSIS Detailed Description
C Interface:
#include <papi.h>
char * PAPI_strerror( int errorCode );
Parameters:
code -- the error code to interpret
Return values:
*error -- a pointer to the error string.
NULL -- the input error code to PAPI_strerror() is invalid.
PAPI_strerror() returns a pointer to the error message corresponding to the error code code. If the call fails the function returns the
NULL pointer. This function is not implemented in Fortran.
Example:
* int ret;
* int EventSet = PAPI_NULL;
* int native = 0x0;
* char error_str[PAPI_MAX_STR_LEN];
*
* ret = PAPI_create_eventset(&EventSet);
* if (ret != PAPI_OK)
* {
* fprintf(stderr, "PAPI error %d: %s0, ret, PAPI_strerror(retval));
* exit(1);
* }
* // Add Total Instructions Executed to our EventSet
* ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
* if (ret != PAPI_OK)
* {
* PAPI_perror( "PAPI_add_event");
* fprintf(stderr,"PAPI_error %d: %s0, ret, error_str);
* exit(1);
* }
* // Start counting
* ret = PAPI_start(EventSet);
* if (ret != PAPI_OK) handle_error(ret);
*
See Also:
PAPI_perror PAPI_set_opt PAPI_get_opt PAPI_shutdown PAPI_set_debug
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_strerror(3)
09-27-2008
<datatype> *)0 - this means regardless of the underlying architecture