I'm trying to create a guessing game where you can play as many times as you want before exiting. The issue I'm having currently is this program does not stop. If you put the correct answer it will just keep saying "Match" for days on end. Same if you get it incorrect.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
main()
{
char name[10][20]= {"DUMBO","MICKEY MOUSE","GOOFY","DONALD DUCK"};
char charName[20];
int count, nameMatch;
char found;
printf("Enter the name of a Disney cartoon character ");
gets(charName);
strupr (charName);
found = 'n';
for (count=0;count<4;count++)
{ if(!strcmp(charName, name[count]))
{found = 'y';}
}
while (nameMatch == 0)
if(found == 'y')
puts("Match");
else
puts("No Match");
system("pause");
return 0;
}
Related
I have a main program that creates two children and each children calls execlv. At the end of the program how do I calculate the CPU times and system times of the parent and two process?
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
int main()
{
pid_t pid1,pid2,wid; // variable for parent and two children
char *my_args[3]; // strign array for containing the arguments for executing sigShooter1
// int aInt = 368; //
char str[15]; // strign to contain the pids of children when passing as command line arguments
pid1 = fork();
if (pid1 < 0)
{
fprintf(stderr, ": fork failed: %s\n", strerror(errno));
exit(1);
}
if(pid1 == 0)
{
my_args[0] = "sigperf1";
my_args[1] = "0";
my_args[2] = NULL;
execv("sigshooter1",my_args);
fprintf(stderr,"sigshooter1 cannot be executed by first child...");
exit(-1);
}
pid2 = fork();
if(pid2 < 0)
{
fprintf(stderr, ": fork failed: %s\n", strerror(errno));
exit(1);
}
if(pid2 == 0)
{
sprintf(str, "%d", pid1);
my_args[0] = "sigperf1";
my_args[1] = str;
my_args[2] = NULL;
// printf("this is converted = %s\n",my_args[1]);
//sleep(1);
execv("sigshooter1",my_args);
fprintf(stderr,"sigshooter1 cannot be executed by second child...");
exit(-1);
}
wid = wait(NULL);
}
You'll need a profiler for that. For starters, you can run perf stat ./a.out to get the total CPU time of all three processes, and perf stat -i ./a.out to get the CPU time of parent process only.
If you need something more detailed, take a look at more serious tools like valgrind or gprof.
Sorry for my ignorance but I am very new in FTDI chip Linux software development.
I have module based on FT245RL chip, programmed to be 4 port output (relays) and 4 port opto isolated input unit.
I found out in Internet program in C to turn on/off relays connected to outputs D0 to D3. After compiling it works properly. Below draft of this working program:
/* switch4.c
* # gcc -o switch4 switch4.c -L. -lftd2xx -Wl,-rpath,/usr/local/lib
* Usage
* # switch4 [0-15], for example # switch4 1
* */
#include <stdio.h>
#include <stdlib.h>
#include "./ftd2xx.h"
int main(int argc, char *argv[])
{
FT_STATUS ftStatus;
FT_HANDLE ftHandle0;
int parametr;
LPVOID pkod;
DWORD nBufferSize = 0x0001;
DWORD dwBytesWritten;
if(argc > 1) {
sscanf(argv[1], "%d", ¶metr);
}
else {
parametr = 0;
}
FT_SetVIDPID(0x5555,0x0001); // id from lsusb
FT_Open(0,&ftHandle0);
FT_SetBitMode(ftHandle0,15,1);
pkod=¶metr;
ftStatus = FT_Write(ftHandle0,pkod,nBufferSize,&dwBytesWritten);
ftStatus = FT_Close(ftHandle0);
}
My question is. How can I read in the same program, status of D4 to D7 pins, programmed as inputs? I mean about "printf" to stdout the number representing status (zero or one) of input pins (or all input/output pins).
Can anybody help newbie ?
UPDATE-1
This is my program with FT_GetBitMode
// # gcc -o read5 read5.c -L. -lftd2xx -Wl,-rpath,/usr/local/lib
#include <stdio.h>
#include <stdlib.h>
#include "./ftd2xx.h"
int main(int argc, char *argv[])
{
FT_STATUS ftStatus;
FT_HANDLE ftHandle0;
UCHAR BitMode;
FT_SetVIDPID(0x5555,0x0001); // id from lsusb
ftStatus = FT_Open(0,&ftHandle0);
if(ftStatus != FT_OK) {
printf("FT_Open failed");
return;
}
FT_SetBitMode(ftHandle0,15,1);
ftStatus = FT_GetBitMode(ftHandle0, &BitMode);
if (ftStatus == FT_OK) {
printf("BitMode contains - %d",BitMode);
}
else {
printf("FT_GetBitMode FAILED!");
}
ftStatus = FT_Close(ftHandle0);
}
But it returns "FT_GetBitMode FAILED!" instead value of BitMode
FT_GetBitMode returns the instantaneous value of the pins. A single byte will be
returned containing the current values of the pins, both those which are inputs and
those which are outputs.
Source.
Finally I found out whats going wrong. I used incorrect version of ftdi library. The correct version dedicated for x86_64 platform is located here:
Link to FTDI library
i am trying to implement the upnp level communication between the devices .. but facing problem in getting the response message .and more over on sending the ssdp:discovery multicast not able to recieve the messages from the devices ... please guide me through i am completely newto this topic
pre-requisite done by me :
1.able to send the M-Search ..and notify message on the network .. and have confirmed via wireshark
2.gone through the upnp architecture related pdf
response got in wireshark :
when ever i am sending the message i am getting the icmp error message that destination is not reachable ..
< client side code > is the first one and second one is the for time being i am just sending up the data on local host
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#define SRV_IP "127.0.0.1"
/* diep(), #includes and #defines like in the server */
#define BUFLEN 512
#define NPACK 10
#define PORT 1900
void diep(char *s)
{
perror(s);
exit(1);
}
int main(void)
{
struct sockaddr_in si_other;
int s, i, slen=sizeof(si_other);
char buf[BUFLEN];
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
diep("socket");
memset((char *) &si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(PORT);
if (inet_aton(SRV_IP, &si_other.sin_addr)==0) {
fprintf(stderr, "inet_aton() failed\n");
exit(1);
}
for (i=0; i<NPACK; i++) {
printf("Sending packet %d\n", i);
sprintf(buf, "\n");
if (sendto(s, buf, BUFLEN, 0, &si_other, slen)==-1)
diep("sendto()");
}
close(s);
return 0;
}
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#define BUFLEN 512
#define NPACK 10
#define PORT 1900
void diep(char *s)
{
perror(s);
exit(1);
}
int main(void)
{
struct sockaddr_in si_me, si_other;
int s, i, slen=sizeof(si_other);
char buf[BUFLEN];
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
diep("socket");
memset((char *) &si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(PORT);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(s, &si_me, sizeof(si_me))==-1)
diep("bind");
for (i=0; i<NPACK; i++) {
if (recvfrom(s, buf, BUFLEN, 0, &si_other, &slen)==-1)
diep("recvfrom()");
printf("Received packet from %s:%d\nData: %s\n\n",
inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port), buf);
}
close(s);
return 0;
}
The individual lines in you M-SEARCH need to have "\r\n" at the end of each line, not just a "\n". Your system may just be sending "\n" across the wire. Check the bytes you're sending for a 13 followed by a 10. That's "\r\n".
Is there any way to get currently logged in user type (root, admin or normal) through objective C?
I know about NSFullUserName() which gives user name, but how to retrieve user type?
Thanks.
You can retrieve the user group using getpwnam or getpwuid then use getgrgid to get the group name from the gid.
These are C functions in the standard library.
-- EDIT: Here is a short, poorly coded C example ---
Here is a small example, on mac os in the terminal it should build using make (if you name the file getpwnam_example.c you can do $ make getpwnam_example in the same directory as the c file).
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <strings.h>
#include <pwd.h>
#include <grp.h>
int main(int argc, char **argv) {
uid_t current_user_id = getuid();
printf("My Current UID is %d\n", current_user_id);
struct passwd *pwentry = getpwuid(current_user_id);
printf("My Current Name is %s\n", pwentry->pw_gecos);
printf("My Current Group ID is %d\n", pwentry->pw_gid);
struct group *grentry = getgrgid(getgid());
printf("My Current Group Name is %s\n", grentry->gr_name);
printf("Am I an admin? ");
struct group *admin_group = getgrnam("admin");
while(*admin_group->gr_mem != NULL) {
if (strcmp(pwentry->pw_name, *admin_group->gr_mem) == 0) {
printf("yes!\n");
}
admin_group->gr_mem++;
}
return 0;
}
Any one please give code snippet for how to print volume header of HFS+ disk.
I’ve written a small program (based on hfs-183.1) that prints some of the information declared in struct HFSPlusVolumeHeader. The program must be run as root — for instance, via sudo(8):
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <hfs/hfs_format.h>
#include <libkern/OSByteOrder.h>
int main(void) {
int fd;
struct stat stat_buf;
struct HFSPlusVolumeHeader vheader;
const char *vname = "/dev/rdisk0s2";
if (lstat(vname, &stat_buf) == -1) {
fprintf(stderr, "Couldn't stat %s\n", vname);
perror(NULL);
exit(1);
}
if ((stat_buf.st_mode & S_IFMT) != S_IFCHR) {
fprintf(stderr, "%s is not a raw char device\n", vname);
perror(NULL);
exit(2);
}
fd = open(vname, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "%s couldn't be opened for reading\n", vname);
perror(NULL);
exit(3);
}
// The volume header starts at offset 1024
if (pread(fd, &vheader, sizeof vheader, 1024) != sizeof vheader) {
fprintf(stderr, "couldn't read %s's volume header\n", vname);
perror(NULL);
exit(4);
}
printf("fileCount = %u\n"
"folderCount = %u\n"
"blockSize = %u\n"
"totalBlocks = %u\n"
"freeBlocks = %u\n",
OSSwapBigToHostInt32(vheader.fileCount),
OSSwapBigToHostInt32(vheader.folderCount),
OSSwapBigToHostInt32(vheader.blockSize),
OSSwapBigToHostInt32(vheader.totalBlocks),
OSSwapBigToHostInt32(vheader.freeBlocks));
close(fd);
return 0;
}
The header file <hfs/hfs_format.h> declares struct HFSPlusVolumeHeader. See this file for the complete list of fields inside a HFS+ volume header.
The system call getattrlist() might give you the information you need.