NAME
closefrom,
close_range —
delete open file descriptors
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
void
closefrom(int
lowfd);
int
close_range(u_int
lowfd, u_int
highfd, int
flags);
DESCRIPTION
Theclosefrom()
system call deletes all open file descriptors greater than or equal to
lowfd from the per-process object reference table. Any
errors encountered while closing file descriptors are ignored.
The
close_range()
system call deletes all open file descriptors between
lowfd and highfd inclusive,
clamped to the range of open file descriptors. Any errors encountered while
closing file descriptors are ignored. There are currently no defined
flags.
RETURN VALUES
Upon successful completion, close_range()
returns a value of 0. Otherwise, a value of -1 is returned and the global
variable errno is set to indicate the error.
ERRORS
The close_range() system call will fail
if:
- [
EINVAL] - The highfd argument is lower than the lowfd argument.
- [
EINVAL] - An invalid flag was set.
SEE ALSO
HISTORY
The closefrom() function first appeared in
FreeBSD 8.0.