Failure in file seek

[Nikhilesh Susarla]

I wanted to seek around a file by opening it using read-only, but then I get this error called "Invalid argument"

https://go-review.googlesource.com/c/go/+/14881

I read the above link and they say it is not supported to seek around. I tried direct lseek in c language and it failed with same. 

Is there any way ? 

Thank you

[Kurtis Rader]

The issue you linked to involves files opened for writing with the O_APPEND flag. That isn't relevant if you opened the file read-only. Please show us the code you wrote.

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Kurtis Rader

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[Ian Lance Taylor]

What that link says is that if you open the file with O_APPEND then you can't Seek.  Are you opening with O_APPEND?

If not you will need to provide more information, such as a small program that demonstrates the problem.

Ian

[Nikhilesh Susarla]

github/file-seek/main.go

I did write with ReadOnly also and it failed. 

Sorry, I assumed both Append and ReadOnly fails.

[Bakul Shah]

>         offset, err := f.Seek(0, 10)

The second argument needs to be one of io.{SeekStart,SeekCurrent,SeekEnd} (0, 1 or 2).

go doc os.File.Seek

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[Nikhilesh Susarla]

Thank you. I completely got both the programs wrong by interchanging the parameters.

Thank you for pointing it out.