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

Question

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

  • O_RDWR
  • O_WRONLY
  • O_RDONLY
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Solution

To open a file in mode read and write in programming, you would typically use the O_RDWR flag.

Explanation of Options

  1. O_RDWR: This flag is used to open a file for both reading and writing. It allows you to read the file's contents and also modify it.

  2. O_WRONLY: This flag is used to open a file for writing only. You cannot read from the file when it is opened with this flag.

  3. O_RDONLY: This flag is used to open a file for reading only. You cannot write to the file when it is opened with this flag.

Conclusion

The correct flag for opening a file in read and write mode is O_RDWR.

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