PDCURSES assignign value to integer make error - windows
I'm using PDCURSES on Windows 7 and my program stops working at the beginning.
I noticed the error is made by assigning value to integer in line: 41 .
Unfortunately I have no idea why.
I'm writing in C in Code blocks.
I would be grateful if someone could help me.
Error message
#include <curses.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define ILOSC_NAZW 5
#define false 0
#define true 1
WINDOW * createwin(int height,int width,int starty,int startx);
void uaktualnij(WINDOW*left,char *nazwa);
void wyswietl_nazwy(WINDOW *right,char **losowe_nazwy);
int poprawnie=0,blednie=0;
int main()
{
char *losowe_nazwy[ILOSC_NAZW]={"JACK","TOM","KEN","JESSY","ANDRIEJ"};
char str[20];
int c,startx,starty,height,width;
WINDOW *right,*left,*console;
initscr();
refresh();
startx=0,starty=0,height=LINES/2,width=COLS/2;
left=createwin(height,width,starty,startx);
startx=COLS/2;
right=createwin(height,width,starty,startx);
startx=0;
starty=LINES/2;
width=COLS;
console=createwin(height,width,starty,startx);
getmaxyx(right,starty,startx);
uaktualnij(right,NULL);
mvwprintw(left,starty/2-starty/4,startx/2-strlen("PODAJ NAZWE UZYTKOWNIKA")/2,"PODAJ NAZWE UZYTKOWNIKA");
wrefresh(left);
wyswietl_nazwy(left,losowe_nazwy);
c=0; // assigning value make error
getmaxyx(console,starty,startx);
wmove(console,starty-2,2);
memset(str,0,sizeof *str);
wclear(console);
wborder(console,0,0,0,0,0,0,0,0);
wrefresh(console);
getch();
endwin();
return 0;
}
WINDOW * createwin(int height,int width,int starty,int startx){
WINDOW *mywin=newwin(height,width,starty,startx);
box(mywin,0,0);
wrefresh(mywin);
return mywin;
}
void czekaj(double sec){
clock_t koniec=clock()+sec*CLOCKS_PER_SEC;
while(clock()<koniec)continue;
}
void wyswietl_nazwy(WINDOW *right,char **losowe_nazwy){
int i=ILOSC_NAZW;
int rstartx,rstarty;
getmaxyx(right,rstarty,rstartx);
while( i>=0)
{
mvwprintw(right,rstarty/2-rstarty/4+2,rstartx/2-strlen(losowe_nazwy[i])/2,"%s",losowe_nazwy[i]);
wrefresh(right);
czekaj(0.2);
wmove(right,rstarty/2-rstarty/4+2,rstartx/2-strlen(losowe_nazwy[i]));
wclrtoeol(right);
mvwaddch(right,rstarty/2-rstarty/4+2,rstartx-1,ACS_VLINE);
wrefresh(right);
i--;
}
}
void uaktualnij(WINDOW*left,char *nazwa){
int startx,starty;
wclear(left);
wborder(left,0,0,0,0,0,0,0,0);
getyx(left,starty,startx);
mvwprintw(left,starty+1,startx+1,"Poprawnie: %i",poprawnie);
mvwprintw(left,starty+2,startx+1,"Blednie: %i",blednie);
if(nazwa!=NULL)
mvwprintw(left,starty+3,startx+1,"Wproawadzona nazwa uzytkowanika: %s",nazwa);
wrefresh(left);
}
Since PDCurses is written in C, I am assuming that you are compiling in C.
Move the
int c;
to just below the line
char *losowe_nazwy[ILOSC_NAZW]={"JACK","TOM","KEN","JESSY","ANDRIEJ"};
int c;
The C language expects those sorts of definitions to be at the top of the function.
Related
Writing a custom nss hosts module
I'm seeking to implement a custom nss module for the getent hosts lookup. Based on glibc's resolv/nss-dns/dns-host.c and gnunet's src/gns/nss/nss_gns.c I wrote the following minimal implementation that I hoped at least should write something to syslog - which it sadly doesn't.
#include <netdb.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <syslog.h>
#define _nss_lash_gethostbyname2_r _nss_lash_gethostbyname_r
#define _nss_lash_gethostbyname3_r _nss_lash_gethostbyname_r
#define _nss_lash_gethostbyname4_r _nss_lash_gethostbyname_r
#define _nss_lash_getcanonname_r _nss_lash_gethostbyaddr_r
#define _nss_lash_gethostbyaddr2_r _nss_lash_gethostbyaddr_r
#define _nss_lash_getnetbyname_r _nss_lash_gethostbyaddr_r
#define _nss_lash_getnetbyaddr_r _nss_lash_gethostbyaddr_r
typedef char addr[1];
const addr default_addrs[2] = {0x01, 0x00};
enum nss_status
_nss_lash_gethostbyname_r (const char *name, struct hostent *result,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
syslog(LOG_WARNING, name);
if (!strcmp(name, "lash")) {
return NSS_STATUS_UNAVAIL;
}
*(result->h_aliases) = 0x0;
result->h_addrtype = AF_INET;
result->h_length = 1;
*(result->h_addr_list) = (char *)default_addrs;
*errnop = 0;
*h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_lash_gethostbyaddr_r (const char *name, struct hostent *result,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
syslog(LOG_ERR, name);
if (!strcmp(name, "lash")) {
return NSS_STATUS_UNAVAIL;
}
*(result->h_aliases) = 0x0;
result->h_addrtype = AF_INET;
result->h_length = 1;
*(result->h_addr_list) = (char *)default_addrs;
*errnop = 0;
*h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS;
}
I've added lash to /etc/nsswitch.conf. strace shows that the /lib/libnss_lash.so.2 file is being successfully opened. However the return value from the nss lookup is NSS_UNAVAIL / ENOENT. If I add [unavail=return] to /etc/nsswitch.conf after the lash entry, I get the same result.
Anyone have any clues to what I'm missing?
(the #define lines attempt to catch all symbols found in objdump -T /lib/libnss_dns.so, which seems to be the simpler implementation)
Using:
glibc 2.30
gnunet 0.11.6-ish
nss 3.49.2
gcc using unlink and readdir, 7 days old files needs to be deleted
Using this code fetched from google.
#include <dirent.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
struct dirent *entry;
DIR *dp;
chdir("/mnt/shared");
dp = opendir(".");
while( (entry = readdir(dp)) != NULL ) {
if ( strcmp(entry->d_name, ".") &&strcmp(entry->d_name, "..") ){
unlink(entry->d_name);
}
}
}`
In this could it be possible to delete files older than 7 days from the current date?
In perl i tried as follows, but wondering this could be achived with your help?
my $now = time();
my $DATEAGE = 60*60*24*7;
for my $file (#file_list) {
my #stats = stat($file);
if ($now-$stats[9] > $DATEAGE) {
print "$file\n";}
Build the full string of the file and use several syscalls(2) (notably stat(2)) ; read Advanced Linux Programming
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
struct dirent *entry;
DIR *dp;
time_t weekago;
time(&weekago);
weekago -= 86400*7;
dp = opendir("/mnt/shared");
if (!dp) { perror("/mnt/shared"); exit(EXIT_FAILURE); };
while( (entry = readdir(dp)) != NULL ) {
if ( strcmp(entry->d_name, ".")
&& strcmp(entry->d_name, "..") ){
char buf[256];
if (snprintf(buf, sizeof(buf),
"/mnt/shared/%s", entry->d_name)
>=sizeof(buf))
{ fprintf(stderr, "too long path %s\n", buf);
exit(EXIT_FAILURE);
};
struct stat st;
if (stat(buf,&st)) {
perror(buf);
exit(EXIT_FAILURE);
};
if ((st.st_mode & S_IFMT) == S_IFREG // a plain file
&& (st.st_mtime < weekago))
{
if (remove(buf)) perror(buf);
}
}
}
My untested code above is imperfect (and not very well indented): it don't handle file paths wider than 255. But you could improve it, e.g. using asprintf(3) to build the path in heap (then you'll need to free it).
Practically speaking, use find(1). If you need to recurse in a file tree in C, use nftw(3)
char * variable declaration
I just want to verify I got this right.
The copy from sr to ds2 gives an error. Is this because ds2 is considered "const"??
Thanks and hope this isn't a bore.
#include <stdio.h>
#include <string.h>
#include <malloc.h>
int main(void)
{
char *sr = "Hello World";
char *ds1 = (char*)malloc(100 * sizeof(char));
char *ds2 = "12345678901234567890";
// This statement works just fine
printf("%s\n", strcpy(ds1, sr));
// This gives error
strcpy(ds2, sr);
printf("%s\n", ds2);
return 0;
}
Here is a similar post difference between char* and char[] with strcpy() When you do this char *ds2 = "12345678901234567890"; the compiler leaves the pointer pointing to a non-writable memory region. With this line // This gives error strcpy(ds2, sr); You are trying to do an strcpy into the non-writable memory. You should also have a free for each malloc as you are allocating memory but not de-allocating it.
GNU Readline library source code
I am trying to modify source code of the GNU Readline library in order to better undestrand how it works. I downloaded version 2.0 here and added an assert(0) statement inside rl_bind_key function in bind.c but it still works when I call this function in my program (main.c):
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "readline.h"
#include "history.h"
int main()
{
char* input, shell_prompt[100];
for (int i = 0; i < 100; i++) {
int val = rl_bind_key('\t', rl_complete);
printf(">> %d\n", val);
}
input = readline(shell_prompt);
if (!input)
break;
add_history(input);
}
Why does that happen?
sys/wait.h and sys/kthread.h do not compile together
I am compiling a kernel module in linux related to creating kthreads to achieve parallelism but I am stuck at compiling issues.
Here is my code:
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <sys/wait.h>
void threadfn1()
{
int j;
for( j = 0; j < 1000000; j++ )
printk(KERN_INFO "I AM THREAD 1 %d\n",j);
}
void threadfn2()
{
int j;
for( j = 0; j < 1000000; j++ )
printk(KERN_INFO "I AM THREAD 2 %d\n",j);
}
static int __init abc_init(void)
{
struct task_struct *t1 = kthread_run(threadfn1, NULL, "thread1");
struct task_struct *t2 = kthread_run(threadfn2, NULL, "thread2");
printk(KERN_INFO "HELLO WORLD\n");
waitpid(-1,NULL,0); // whatever the parameters of waitpid() are
}
static void __exit abc_fini(void)
{
printk(KERN_INFO "BYE WORLD\n");
}
module_init(abc_init);
module_exit(abc_fini);
The problem with my code is that when i compile my kernel module with make, sys/wait.h gives compiling errors like "redefinition of some strcut xyz" any many more errors, when linux/module.h and linux/kthread.h are also included. As soon as i comment out these two files, the module compiles well but gives a linking error that "waitpid" is undefined.
Why doesnt sys/wait.h compile well with linux/kthread.h and linux/module.h? Has anyone encountered this problem before?
Any help would be appreciated.
It is incorrect to include userspace headers, like sys/wait.h, in kernel code.