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Full Discussion: error message when use fork with open file
Top Forums UNIX for Dummies Questions & Answers error message when use fork with open file Post 302399112 by rosecomp on Friday 26th of February 2010 10:35:25 AM
Old 02-26-2010
error message when use fork with open file
I get this message when I write myshell.c program "VM pagefault:SIGSEGV bad add 0x0 err 0x4 nopage read myshell PM: ciredump signal 11 for 1725 /myshell memory fault (core dumped)"
Code:
/* RCS information: $Id: myshell.c,v 1.2 2006/04/05 22:46:33 elm Exp $ */
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
extern char **getline();
/*Run command with and without arguments*/
void runc(const char *n, char *av[]){
 pid_t pid;
 int status;
 pid=fork();
 if (pid == 0) {
  /* Child */
         execvp(n,av);
                perror("You print wrong command");
  exit(-1);
 }
 else {
  /* Parent */
  wait(&status);
 }
}
void out(const char *n, char *av[]){
   int fd;
 fd = open("outf", O_WRONLY|O_CREAT); 
 if (fd < 0) {
  fprintf(stderr, "Couldn't open file for writing.\n");
 }
 dup2(fd, 1);
 /*execvp("ls",args);*/
 /*{execvp(n,av);}*/
 runc(n,av);
 close(fd);
}
int main() {
  int i;
  char **args; 
  pid_t pid;
  int status;

  while(1) {
    printf("$ ");
    args = getline();
    for(i = 0; args[i] != NULL; i++) {
      printf("Argument %d: %s\n", i, args[i]);
    }
  
 /*Exit command to terminate shell */
 if (strcmp(args[0],"exit")==0)
  exit();
 /*Run command with and without arguments*/
 /*{runc(args[0],args);*/
 out(args[0],args);
  }
 return 0;
}

Last edited by pludi; 02-26-2010 at 11:48 AM.. Reason: code tags, please...
 

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LEARN ABOUT CENTOS

tapset::memory

tapset::memory(3stap)													     tapset::memory(3stap)

NAME

       tapset::memory - systemtap memory tapset

DESCRIPTION

	This family of probe points is used to probe memory-related events.

       vm_fault_contains
	      Test return value for page fault reason

	      See function::vm_fault_contains(3stap)
	       for details.

       vm.pagefault
	      Records that a page fault occurred

	       See probe::vm.pagefault(3stap)
	       for details.

       vm.pagefault.return
	      Indicates what type of fault occurred

	       See probe::vm.pagefault.return(3stap)
	       for details.

       addr_to_node
	      Returns which node a given address belongs to within a NUMA system

	      See function::addr_to_node(3stap)
	       for details.

       vm.write_shared
	      Attempts at writing to a shared page

	       See probe::vm.write_shared(3stap)
	       for details.

       vm.write_shared_copy
	      Page copy for shared page write

	       See probe::vm.write_shared_copy(3stap)
	       for details.

       vm.mmap
	      Fires when an mmap is requested

	       See probe::vm.mmap(3stap)
	       for details.

       vm.munmap
	      Fires when an munmap is requested

	       See probe::vm.munmap(3stap)
	       for details.

       vm.brk Fires when a brk is requested (i.e. the heap will be resized)

	       See probe::vm.brk(3stap)
	       for details.

       vm.oom_kill
	      Fires when a thread is selected for termination by the OOM killer

	       See probe::vm.oom_kill(3stap)
	       for details.

       vm.kmalloc
	      Fires when kmalloc is requested

	       See probe::vm.kmalloc(3stap)
	       for details.

       vm.kmem_cache_alloc
	      Fires when kmem_cache_alloc is requested

	       See probe::vm.kmem_cache_alloc(3stap)
	       for details.

       vm.kmalloc_node
	      Fires when kmalloc_node is requested

	       See probe::vm.kmalloc_node(3stap)
	       for details.

       vm.kmem_cache_alloc_node
	      Fires when kmem_cache_alloc_node is requested

	       See probe::vm.kmem_cache_alloc_node(3stap)
	       for details.

       vm.kfree
	      Fires when kfree is requested

	       See probe::vm.kfree(3stap)
	       for details.

       vm.kmem_cache_free
	      Fires when kmem_cache_free is requested

	       See probe::vm.kmem_cache_free(3stap)
	       for details.

SEE ALSO

	 function::vm_fault_contains(3stap),	function::addr_to_node(3stap),	  probe::vm.pagefault(3stap),  probe::vm.pagefault.return(3stap),
       probe::vm.write_shared(3stap),	     probe::vm.write_shared_copy(3stap),	probe::vm.mmap(3stap),	      probe::vm.munmap(3stap),
       probe::vm.brk(3stap),	      probe::vm.oom_kill(3stap),	  probe::vm.kmalloc(3stap),	    probe::vm.kmem_cache_alloc(3stap),
       probe::vm.kmalloc_node(3stap),	 probe::vm.kmem_cache_alloc_node(3stap),    probe::vm.kfree(3stap),    probe::vm.kmem_cache_free(3stap),
       stap(1), stapprobes(3stap)

IBM
									---						     tapset::memory(3stap)
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