Script started on Wed Nov 19 17:26:54 2025
macbook:logs> cd ../programs/unix_ch13
macbook:unix_ch13> cd ../unix_ch12
macbook:unix_ch12> cd make_project_v2 
macbook:make_project_v2> ls
db		db.h		parts.h		README.txt	supps.h
db.c		Makefile	parts.s		supps.c
macbook:make_project_v2> more parts.s
        .section        __TEXT,__text,regular,pure_instructions
        .build_version macos, 15, 0     sdk_version 26, 1
        .globl  _array_init                     ; -- Begin function array_init
        .p2align        2
_array_init:                            ; @array_init
        .cfi_startproc
; %bb.0:
        sub     sp, sp, #16
        .cfi_def_cfa_offset 16
        str     x0, [sp, #8]
        str     wzr, [sp, #4]
        b       LBB0_1
LBB0_1:                                 ; =>This Inner Loop Header: Depth=1
        ldr     w8, [sp, #4]
        subs    w8, w8, #10
        b.ge    LBB0_4
        b       LBB0_2
LBB0_2:                                 ;   in Loop: Header=BB0_1 Depth=1
        ldr     x8, [sp, #8]
        str     wzr, [x8]
        ldr     x8, [sp, #8]
        add     x8, x8, #4
        str     x8, [sp, #8]
        b       LBB0_3
LBB0_3:                                 ;   in Loop: Header=BB0_1 Depth=1
        ldr     w8, [sp, #4]
        add     w8, w8, #1
        str     w8, [sp, #4]
        b       LBB0_1
LBB0_4:
        add     sp, sp, #16
        ret
        .cfi_endproc
                                        ; -- End function
        .globl  _array_length                   ; -- Begin function array_length
        .p2align        2
_array_length:                          ; @array_length
        .cfi_startproc
; %bb.0:
        mov     w0, #10                         ; =0xa
        ret
        .cfi_endproc
                                        ; -- End function
        .globl  _array_set                      ; -- Begin function array_set
        .p2align        2
_array_set:                             ; @array_set
        .cfi_startproc
; %bb.0:
        sub     sp, sp, #16
        .cfi_def_cfa_offset 16
        str     w0, [sp, #12]
        str     w1, [sp, #8]
        ldr     w8, [sp, #12]
        tbnz    w8, #31, LBB2_3
        b       LBB2_1
LBB2_1:
        ldr     w8, [sp, #12]
        subs    w8, w8, #10
        b.ge    LBB2_3
        b       LBB2_2
LBB2_2:
        ldr     w8, [sp, #8]
        ldrsw   x10, [sp, #12]
        adrp    x9, _a@GOTPAGE
        ldr     x9, [x9, _a@GOTPAGEOFF]
        str     w8, [x9, x10, lsl #2]
        b       LBB2_3
LBB2_3:
        add     sp, sp, #16
        ret
        .cfi_endproc
                                        ; -- End function
        .comm   _a,40,2                         ; @a
.subsections_via_symbols
macbook:make_project_v2> cat Makefile 
db:   db.o supps.o parts.o 
	echo "make db" ; gcc db.o supps.o parts.o -o db

db.o: db.c db.h supps.h parts.h 
	echo "make db.o" ; gcc -c db.c

supps.o: supps.c supps.h
	echo "make supps.o" ; gcc -c supps.c

parts.o: parts.s parts.h
	echo "make parts.o" ; gcc -c parts.s

macbook:make_project_v2> touch *.c
macbook:make_project_v2> touch *.s
macbook:make_project_v2> make
echo "make db.o" ; gcc -c db.c
make db.o
echo "make supps.o" ; gcc -c supps.c
make supps.o
echo "make parts.o" ; gcc -c parts.s
make parts.o
echo "make db" ; gcc db.o supps.o parts.o -o db
make db
macbook:make_project_v2> ./db
The array has 10 values
Value 5 is prime.
macbook:make_project_v2> cd ../
macbook:unix_ch12> cd ../
macbook:programs> cdn unix_ch13
zsh: command not found: cdn
macbook:programs> grep WRON *.c
macbook:programs> cat fileIOerror.c
cat: fileIOerror.c: No such file or directory
macbook:programs> cd unix_ch13
macbook:unix_ch13> cat fileIOerror.c
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int main () {
  int fd;

  /* Open a non-existent file to cause an error */
  fd = open ("nonexist.txt", O_RDONLY);
  if (fd == -1) /* fd == -1 =, an error occurred */ {
    printf ("errno = %d\n", errno);
    perror ("main");
  }

  /* Force a different error */
  fd = open ("/", O_WRONLY);
  if (fd == -1) {
    printf ("errno = %d\n", errno);
    perror ("main");
  }

  /* Execute a successful system call */
  fd = open ("nonexist.txt", O_RDONLY | O_CREAT, 0644);

  /* Display after successful call */
  printf ("errno = %d\n", errno);

  /* will display previous error num (21) */
  perror ("main");
  errno = 0; /* Manually reset error variable */
  perror ("main");

  return 0;
}
macbook:unix_ch13> ls nonexist.txt
ls: nonexist.txt: No such file or directory
macbook:unix_ch13> gcc fileIOerror.c
macbook:unix_ch13> ./a.out
errno = 2
main: No such file or directory
errno = 21
main: Is a directory
errno = 21
main: Is a directory
main: Undefined error: 0
macbook:unix_ch13> ls nonexist.txt  
nonexist.txt
macbook:unix_ch13> grep SEEK *.c
reverse_unix_ch13_original.c:  lseek (fd, lineStart[i], SEEK_SET); /* Find the line and read it */
reverse_unix_ch13.c:  lseek (fd, lineStart[i], SEEK_SET); /* Find the line and read it */
sparse.c:  lseek (fd, 60006, SEEK_SET);
macbook:unix_ch13> vi seek_example.txt
macbook:unix_ch13> mv seek_example.txt seek_example.c   
macbook:unix_ch13> cat seek_example.c 
// from char_count_per_line.c 

    // Borrowed from the help file
    // Get the length of 'infile'.
    curpos = ftell(in);
    fseek(in, 0L, SEEK_END);
    length1 = ftell(in);
    fseek(in, curpos, SEEK_SET);
    fclose(in);                      
    if (DEBUG)
      printf("Size of file is %ld\n",length1);

macbook:unix_ch13> cat processDirectory.c
// This function is from Glass and Ables' Unix book
// See monitor.c (starting on p 453)

#include <stdio.h>         /* For printf, fprintf */
#include <stdlib.h>  // exit()
#include <string.h>        /* For strcmp */
#include <ctype.h>         /* For isdigit */
#include <fcntl.h>         /* For O_RDONLY */
#include <dirent.h>        /* For getdents */
#include <sys/stat.h>      /* For IS macros */
#include <sys/types.h>     /* For modet */
#include <time.h>      /* For localtime, asctime */


void processDirectory (char* dirName) {

/* Process all files in the named directory */

  DIR *dp;

  struct dirent *dep;

  //char fileName [MAX_FILENAME];

  dp = opendir (dirName); /* Open for reading */
  if (dp == NULL) {
    perror("monitor: ");
    exit(1);
  }

  while ((dep = readdir(dp))) /* Read all dir entries */ {
    if (strcmp (dep->d_name, ".") != 0&&
        strcmp (dep->d_name, "..") != 0) /* Skip . .. */ {
      printf ("%s/%s \n", dirName, dep->d_name); // was sprintf
      //monitorFile (fileName);  /* Call recursively */
    }
  }

  closedir (dp); /* Close directory */

}


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

  if (argc < 2) {
    printf("You need to pass a dir name\n");
    return -1;
  }

  processDirectory(argv[1]);

  return 0;

}
macbook:unix_ch13> gcc processDirectory.c
macbook:unix_ch13> ./a.out .
./myfork.c 
./monitor_original.c 
./pgrp2.c 
./myexec.c 
./myfork2.c 
./monitor.c 
./pipe_fork_signal_wait.c 
./unnamed_pipes_figure.txt 
./process2.c 
./processDirectory.c 
./exec_man_page.html 
./nonexist.txt 
./seek_example.c 
./mychdir.c 
./sparse.c 
./pgrp1.c 
./sparse.txt 
./myexit.c 
./lstat_example.c 
./mydup.c 
./fork_example2.c 
./zombie.c 
./talk.c 
./myfork4.c 
./reverse_ch13_KandR.c 
./a.out 
./reverse_unix_ch13.c 
./pipe_example.c 
./mydup_w_comments.c 
./pipe_example_3.c 
./test.txt 
./pipe_example_v2.c 
./fork_example.c 
./orphan.c 
./processDirectory_v2.c 
./myfork3.c 
./wait.c 
./reverse_unix_ch13_original.c 
./mywait.c 
./fileIOerror.c 
./talk 
./normal.txt 
macbook:unix_ch13> 
macbook:unix_ch13> echo "Whats is your favorite language?"
Whats is your favorite language?
macbook:unix_ch13> exit

Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
Deleting expired sessions...none found.

Script done on Wed Nov 19 18:44:31 2025