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#include /* mycat: concatenate files */    void filecopy(FILE *, FILE *);   int main(int argc, char *argv[]){   FILE *fp;   if (argc == 1){ /* no args, copy standard input */        filecopy(stdin, stdout);     }else{      while (--argc > 0){          if ((fp = fopen(*++argv, "r")) == NULL)          {             printf("cat: cannot open %s\n", *argv);                     return 1;                } else {                   filecopy(fp, stdout);               fclose(fp);          }        }   }      return 0; } /* filecopy: copy file ifp to file ofp */ #include void filecopy(FILE *ifp, FILE *ofp) {     int c;       while ((c = getc(ifp)) != EOF)      putc(c,ofp); }

#include /* mycat: concatenate files */    void filecopy(FILE *, FILE *);   int main(int argc, char *argv[]){   FILE *fp;   if (argc == 1){ /* no args, copy standard input */        filecopy(stdin, stdout);     }else{      while (--argc > 0){          if ((fp = fopen(*++argv, "r")) == NULL)          {             printf("cat: cannot open %s\n", *argv);                     return 1;                } else {                   filecopy(fp, stdout);               fclose(fp);          }        }   }      return 0; } /* filecopy: copy file ifp to file ofp */ #include void filecopy(FILE *ifp, FILE *ofp) {     int c;       while ((c = getc(ifp)) != EOF)      putc(c,ofp); }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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#include <stdio.h> /* mycat: concatenate files */ 

 

void filecopy(FILE *, FILE *);

 

int main(int argc, char *argv[]){

  FILE *fp;

  if (argc == 1){ /* no args, copy standard input */  

     filecopy(stdin, stdout);  

  }else{

     while (--argc > 0){

         if ((fp = fopen(*++argv, "r")) == NULL)

         {

            printf("cat: cannot open %s\n", *argv);        

            return 1;      

         } else {      

            filecopy(fp, stdout);  

            fclose(fp);

         } 

      }

  }   

  return 0;

}

/* filecopy: copy file ifp to file ofp */

#include <stdio.h>

void filecopy(FILE *ifp, FILE *ofp)

{ 

   int c;   

   while ((c = getc(ifp)) != EOF)

     putc(c,ofp);

}

Use to look at mycat in operation. Type $ strace ./mycat cmd2. sh to see it print to the console the contents of filecopy.c. You may well see quite a lot of things going on, but we can limit this to only a set of system calls interested in. Issue the command: we are $ strace - C - e trace = open, close,read, write ./mycat cmd2. sh This will limit the output to only the file system calls and also print a summary.
Transcribed Image Text:Use to look at mycat in operation. Type $ strace ./mycat cmd2. sh to see it print to the console the contents of filecopy.c. You may well see quite a lot of things going on, but we can limit this to only a set of system calls interested in. Issue the command: we are $ strace - C - e trace = open, close,read, write ./mycat cmd2. sh This will limit the output to only the file system calls and also print a summary.
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