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C program. Finish the following TODO segments:   // TODO: Spawn a child process   ??? = ???;   // CHILD CODE   // TODO: Conditional for child only   if( ??? ){     printf("Child redirecting output to '%s', then exec()'ing\n",            output_file);     // TODO: Open output_file for writing, same options as in switch_stdout.c     int out_fd = ???         // TODO: Copy out_fd to standard output FD table entry     d??? ( ??? );         // TODO: Execute the command in child_argv[] replacing this process     exec??( ??? );     printf("exec() seems to have failed...\n"); // should not reach this     exit(1);   }

C program. Finish the following TODO segments:   // TODO: Spawn a child process   ??? = ???;   // CHILD CODE   // TODO: Conditional for child only   if( ??? ){     printf("Child redirecting output to '%s', then exec()'ing\n",            output_file);     // TODO: Open output_file for writing, same options as in switch_stdout.c     int out_fd = ???         // TODO: Copy out_fd to standard output FD table entry     d??? ( ??? );         // TODO: Execute the command in child_argv[] replacing this process     exec??( ??? );     printf("exec() seems to have failed...\n"); // should not reach this     exit(1);   }

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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C program. Finish the following TODO segments:


  // TODO: Spawn a child process
  ??? = ???;

  // CHILD CODE
  // TODO: Conditional for child only
  if( ??? ){
    printf("Child redirecting output to '%s', then exec()'ing\n",
           output_file);

    // TODO: Open output_file for writing, same options as in switch_stdout.c
    int out_fd = ???
   
    // TODO: Copy out_fd to standard output FD table entry
    d??? ( ??? );
   
    // TODO: Execute the command in child_argv[] replacing this process
    exec??( ??? );

    printf("exec() seems to have failed...\n"); // should not reach this
    exit(1);
  }
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