CODEWITHSUNDEEP
c++linux
user1343318
user1343318

Reputation: 2141

ftruncate on linux gives invalid arguments error

I have looked at ftruncate documentation from here, as well as well from here. In the case of IBM link, I implemented my ftruncate accordingly but it gives me Invalid Arguments error. Here is the code:

char const *path = "mozunit.txt";
int file_ = open(path, O_RDONLY, 0600);
int ftrunc_ = ftruncate(file_, 1);
cout<<strerror(errno)<<endl;

Why is it? I tried changing the second parameter in ftruncate but to no avail.

Upvotes: 0

Views: 5140

Answers (1)

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 799230

From the ftruncate(2) man page:

  EBADF or EINVAL
          fd is not open for writing.

Seeing as how you've opened the file as read-only...

Upvotes: 10

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