Slides: Lab Working Day

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# Lab Working Day
## CSC 213 – September 30, 2026

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# Agenda for Today
1. Department Events
2. Upcoming Work
3. Files and Directories, _continued_
5. Wrap Up

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# Department Events

## Flu and COVID Shot Clinic
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  October 1st and 2nd from 9am–4pm in the Harris Center  
  Register with Hy-Vee at <https://tinyurl.com/f26-flu-shot>
]

## CS Table: Topic TBD
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  Tuesday, October 6th at noon in the CS Commons
]

*To receive a token, send an email to let me know you attended no more than 48 hours after the event.*

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# Upcoming Work

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# Assignment: Listing Directories
**Due:** Wednesday, October 7th by 11:59pm  
**Late Deadline:** Friday, October 9th by 10:00am

*Let's look at the assignment now.*

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# Lab: Malloc
**Due:** Wednesday, October 7th by 11:59pm  
**Late Deadline:** Monday, October 12th by 11:59pm

## Questions
_No new questions since last class_

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# File and Directory Puzzles, _continued_

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# Puzzle 7
```c
int fd = open("symlink.txt", O_RDWR | O_CREAT | O_TRUNC, 0640);
char* message = "I love the malloc lab\n";
write(fd, message, strlen(message));
close(fd);
```

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# Puzzle 10
```c
int fd = open("message.txt", O_RDWR, 0640);
char* data = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
data[2] = 'f';
data[3] = 'e';
data[4] = 'a';
data[5] = 'r';
munmap(data, 4096);
close(fd);
```

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# Lab Working Time

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# Wrap Up

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# Reminders

## Upcoming Deadlines
- **Malloc Lab:** due next Wednesday, or the following Monday with a token
- **Listing Directories Assignment:** due next Wednesday, or Friday morning with a token

## Need help? Use your resources!
- Book an appointment during office hours
- Attend mentor office hours
- Review slides, readings, and other course resources
- Use tools like `gdb` and AddressSanitizer to catch and diagnose issues

## Reading

- **File System Implementation** (OSTEP, Chapter 40)
            
- **Crash Consistency: FSCK and Journaling** (OSTEP, Chapter 42)