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assign children pid's created in a loop to an array

With arrays, why is it the case that a[5] == 5[a]?Parent process doesn't complete after child is terminated in CProgram run in child process doesn't loopDifference between the address space of parent process and its child process in Linux?Why are elementwise additions much faster in separate loops than in a combined loop?how to kill parent and child process through shell?Killing a child process from a signal handlerLearning to fork() idle processes in C++Loading pid_t into an array for use OUTSIDE of forked process C/linuxFork() child processes with signals

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2

(Edited: fixed some stuff based on your comments but still not results i need- some procesess get orphaned and get parent init(pid 1), is it because termination loop is inside the other loop? how else could i activate and terminate on the same loop that i forked? )

In the following code, I need to print the pid's created with fork() in the loop in a message when a signal is sent to the process but I get the default value for all pid's (0). The homework involved sending signals to the child processes according to the arguments series ie ./a.out 1 3 5 4 2 will have to send signals to child processes 1 3 5 4 2 in that order and print their pid in that order also.

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>

/*SIGCHLD, SIGCONT*/
int status;
static int alarmOn = 0;
int main(int argc, char **argv)
 

 pid_t pid[5], f;
 void activateChild(int signal)
 
 alarmOn = 1;
 
 (void) signal(SIGCONT,activateChild);


 for(int i = 0; i < 5; i++) 
 
 f = fork();
 if (f < 0 )
 

 printf("nfork failedn");

 
 if (f == 0)
 

 printf("nprocess %d, %d is pausedn",i,getpid());
 pause(); 
 

 if (f > 0)
 


 pid[i]=f;
 kill(pid[atoi(argv[i])],SIGCONT);
 if(alarmOn)
 
 printf("nchild %s pid: %d is executed %dn ",argv[i+1],pid[atoi(argv[i+1])],i);
 sleep(3);
 

 kill(pid[atoi(argv[i+1])],SIGCHLD);



 


 
 exit(0);


return(0);
 

c fork

share|improve this question

edited Mar 25 at 16:15

Theo Stef

asked Mar 24 at 23:38

Theo StefTheo Stef

115

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  use atoi(argv[j]) to convert a parameter string to a number.
  
  – Ctx
  Mar 24 at 23:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  and you probably shouldn't hardcode for 5 arguments, but utilize argc.
  
  – Ctx
  Mar 24 at 23:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This doesn't even compile. Please copy paste the exact code you are using.
  
  – Ring Ø
  Mar 25 at 0:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @RingØ This is one of the rare posts, which indeed are close to an MCVE. Just because a single character got lost doesn't negate that. +1 from me. (just the indention could be improved ;)
  
  – Ctx
  Mar 25 at 0:03
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Remember array indexing in C is zero based. When you declare pid_t pid[5], you are allowed to access pid[0] through pid[4], but instead you access pid[1] through pid[5], and the last of these is out of bounds.
  
  – Nate Eldredge
  Mar 25 at 0:30
  
  

  
  
  
  

 | 
show 4 more comments

2

(Edited: fixed some stuff based on your comments but still not results i need- some procesess get orphaned and get parent init(pid 1), is it because termination loop is inside the other loop? how else could i activate and terminate on the same loop that i forked? )

In the following code, I need to print the pid's created with fork() in the loop in a message when a signal is sent to the process but I get the default value for all pid's (0). The homework involved sending signals to the child processes according to the arguments series ie ./a.out 1 3 5 4 2 will have to send signals to child processes 1 3 5 4 2 in that order and print their pid in that order also.

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>

/*SIGCHLD, SIGCONT*/
int status;
static int alarmOn = 0;
int main(int argc, char **argv)
 

 pid_t pid[5], f;
 void activateChild(int signal)
 
 alarmOn = 1;
 
 (void) signal(SIGCONT,activateChild);


 for(int i = 0; i < 5; i++) 
 
 f = fork();
 if (f < 0 )
 

 printf("nfork failedn");

 
 if (f == 0)
 

 printf("nprocess %d, %d is pausedn",i,getpid());
 pause(); 
 

 if (f > 0)
 


 pid[i]=f;
 kill(pid[atoi(argv[i])],SIGCONT);
 if(alarmOn)
 
 printf("nchild %s pid: %d is executed %dn ",argv[i+1],pid[atoi(argv[i+1])],i);
 sleep(3);
 

 kill(pid[atoi(argv[i+1])],SIGCHLD);



 


 
 exit(0);


return(0);
 

c fork

share|improve this question

edited Mar 25 at 16:15

Theo Stef

asked Mar 24 at 23:38

Theo StefTheo Stef

115

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  use atoi(argv[j]) to convert a parameter string to a number.
  
  – Ctx
  Mar 24 at 23:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  and you probably shouldn't hardcode for 5 arguments, but utilize argc.
  
  – Ctx
  Mar 24 at 23:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This doesn't even compile. Please copy paste the exact code you are using.
  
  – Ring Ø
  Mar 25 at 0:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @RingØ This is one of the rare posts, which indeed are close to an MCVE. Just because a single character got lost doesn't negate that. +1 from me. (just the indention could be improved ;)
  
  – Ctx
  Mar 25 at 0:03
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Remember array indexing in C is zero based. When you declare pid_t pid[5], you are allowed to access pid[0] through pid[4], but instead you access pid[1] through pid[5], and the last of these is out of bounds.
  
  – Nate Eldredge
  Mar 25 at 0:30
  
  

  
  
  
  

 | 
show 4 more comments

(Edited: fixed some stuff based on your comments but still not results i need- some procesess get orphaned and get parent init(pid 1), is it because termination loop is inside the other loop? how else could i activate and terminate on the same loop that i forked? )

In the following code, I need to print the pid's created with fork() in the loop in a message when a signal is sent to the process but I get the default value for all pid's (0). The homework involved sending signals to the child processes according to the arguments series ie ./a.out 1 3 5 4 2 will have to send signals to child processes 1 3 5 4 2 in that order and print their pid in that order also.

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>

/*SIGCHLD, SIGCONT*/
int status;
static int alarmOn = 0;
int main(int argc, char **argv)
 

 pid_t pid[5], f;
 void activateChild(int signal)
 
 alarmOn = 1;
 
 (void) signal(SIGCONT,activateChild);


 for(int i = 0; i < 5; i++) 
 
 f = fork();
 if (f < 0 )
 

 printf("nfork failedn");

 
 if (f == 0)
 

 printf("nprocess %d, %d is pausedn",i,getpid());
 pause(); 
 

 if (f > 0)
 


 pid[i]=f;
 kill(pid[atoi(argv[i])],SIGCONT);
 if(alarmOn)
 
 printf("nchild %s pid: %d is executed %dn ",argv[i+1],pid[atoi(argv[i+1])],i);
 sleep(3);
 

 kill(pid[atoi(argv[i+1])],SIGCHLD);



 


 
 exit(0);


return(0);
 

c fork

share|improve this question

edited Mar 25 at 16:15

Theo Stef

asked Mar 24 at 23:38

Theo StefTheo Stef

115

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>

/*SIGCHLD, SIGCONT*/
int status;
static int alarmOn = 0;
int main(int argc, char **argv)
 

 pid_t pid[5], f;
 void activateChild(int signal)
 
 alarmOn = 1;
 
 (void) signal(SIGCONT,activateChild);


 for(int i = 0; i < 5; i++) 
 
 f = fork();
 if (f < 0 )
 

 printf("nfork failedn");

 
 if (f == 0)
 

 printf("nprocess %d, %d is pausedn",i,getpid());
 pause(); 
 

 if (f > 0)
 


 pid[i]=f;
 kill(pid[atoi(argv[i])],SIGCONT);
 if(alarmOn)
 
 printf("nchild %s pid: %d is executed %dn ",argv[i+1],pid[atoi(argv[i+1])],i);
 sleep(3);
 

 kill(pid[atoi(argv[i+1])],SIGCHLD);



 


 
 exit(0);


return(0);
 

share|improve this question

edited Mar 25 at 16:15

Theo Stef

asked Mar 24 at 23:38

Theo StefTheo Stef

115

share|improve this question

edited Mar 25 at 16:15

Theo Stef

asked Mar 24 at 23:38

Theo StefTheo Stef

115

asked Mar 24 at 23:38

Theo StefTheo Stef

115

asked Mar 24 at 23:38

Theo StefTheo Stef

115