CODEWITHSUNDEEP
cfile-descriptorfile-handlingfdopen
mukesh
mukesh

Reputation: 726

Create a file descriptor

I want to create a file descriptor in C whose value i will specify in code. I have a integer variable which specifies the value of file descriptor to be created. For example i may need a file descriptor whose value is 5 and later associate that with the file named "sample.dat" .

Upvotes: 6

Views: 25754

Answers (2)

phoxis
phoxis

Reputation: 61970

fd = open ("sample.dat", O_RDONLY); open the file

dup2 (fd, 5); and copy the file descriptor fd into the descriptor number 5

now you can do read (5, buffer, BUFF_MAX); or also use fd to access the same file. You need to close the fd explicitly if you do not need it.

As @Arkadiy told see man dup2 for details.

Upvotes: 6

user3458
user3458

Reputation:

You need dup2()

http://linux.die.net/man/2/dup

Upvotes: 4

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