C : how can I change from file descriptor to FILE struct and vice versa?

Question

Is there any way to change an int file descriptor to a FILE struct pointer or/and change FILE* to a file descriptor in C?

score 39 · Accepted Answer · answered Nov 18 '10 at 02:04

39

The function fdopen() returns a new (FILE *) associated with an open file descriptor.

The function fileno() returns the file descriptor associated with an open FILE *.

answered Nov 18 '10 at 02:04

Kamal

3

Caveat: `fdopen` takes ownership, whereas `fileno` returns a view. It is very difficult to avoid some of the edge cases even if you use `dup` in conjunction, since `fclose` modifies the underlying file descriptor. – o11c Jun 09 '18 at 16:09

score 28 · Answer 2 · answered Nov 18 '10 at 02:04

28

Use "fileno()" for FILE->int.

Use "fdopen()" for int->FILE.

answered Nov 18 '10 at 02:04

user172818

2 Answers2