The `oflag` argument in the `open` system call determines the file access mode. To open a file in read and write mode, you can use the `O_RDWR` flag. Here's how you can do it: 1. Include the necessary headers: `#include ` 2. Open the file: `int fd = open("filename", O_RDWR);` If the file is successfully opened, the `open` function will return a non-negative integer, which is the file descriptor. If the file cannot be opened, it will return -1. Remember to always check the return value of `open` to make sure the file was opened successfully.

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The `oflag` argument in the `open` system call determines the file access mode. To open a file in read and write mode, you can use the `O_RDWR` flag. Here's how you can do it:

1. Include the necessary headers: `#include <fcntl.h>`

2. Open the file: `int fd = open("filename", O_RDWR);`

If the file is successfully opened, the `open` function will return a non-negative integer, which is the file descriptor. If the file cannot be opened, it will return -1.

Remember to always check the return value of `open` to make sure the file was opened successfully.

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The `oflag` argument in the `open` system call determines the file access mode. To open a file in read and write mode, you can use the `O_RDWR` flag. Here's how you can do it:

1. Include the necessary headers: `#include <fcntl.h>`

2. Open the file: `int fd = open("filename", O_RDWR);`

If the file is successfully opened, the `open` function will return a non-negative integer, which is the file descriptor. If the file cannot be opened, it will return -1.

Remember to always check the return value of `open` to make sure the file was opened successfully.

What is the oflag used to open a file in mode read + write?

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