c - Why is the parent process not executing at all? -

following program shared memory implementation parent , child processes use shared memory printing next alphabet given parent.

there shared memory , both processes attaching obtain required result. in code, parent process not execute @ all.

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<string.h> #include<sys/ipc.h> #include<sys/shm.h> #include<sys/types.h> int main(int argc,char *argv[])  {    int smid;    pid_t x;    char *sm;    smid=shmget(ipc_private,(size_t)sizeof(char),ipc_creat);    x=fork();    if(x>0)     {       sm=(char *)shmat(smid,null,0);      sprintf(sm,"%s",argv[1]);      printf("parent wrote:\n");      puts(sm);      sleep(4);      printf("parent got:\n");      puts(sm);      shmdt(sm);      shmctl(smid,ipc_rmid,null);       }      else if(x==0)      {       sleep(2);  sm=(char *)shmat(smid,null,0);  printf("child read:\n");  puts(sm);  sm[0]++;     }   return 0;  } 

pretty cause program

smid=shmget(ipc_private,(size_t)sizeof(char),ipc_creat); 

src allocated single byte follows bizzare,

    char *src=(char *)malloc(sizeof(char));     strcpy(src,argv[0]); // argv[0] more 1      sm=(char *)shmat(smid,null,0);     sprintf(sm,"%s",src); // has null @ end 

loosely fixed program..

    int smid;     pid_t x;     char *sm;     smid=shmget(ipc_private,(size_t)120*sizeof(char),ipc_creat|0666); // permissions , size important     perror("smid ");     x=fork();     if(x>0)     {             char *src=(char *)malloc(120*sizeof(char)); // size key here             sm=(char *)shmat(smid,null,0);             perror("shmat" );             strcpy(src,argv[0]);             sprintf(sm,"%s",src);             printf("parent wrote:\n");             puts(sm);             sleep(4);             printf("parent got:\n");             puts(sm);             shmdt(sm);             shmctl(smid,ipc_rmid,null);     }     else if(x==0)     {             sleep(2);             sm=(char *)shmat(smid,null,0);             printf("child read:\n");             puts(sm);             sm[0]++;     }