NAME

       closefrom, close_range — delete open file descriptors

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <unistd.h>

       void
       closefrom(int lowfd);

       int
       close_range(u_int lowfd, u_int highfd, int flags);

DESCRIPTION

       The  closefrom()  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

       close(2)

HISTORY

       The closefrom() function first appeared in FreeBSD 8.0.

Debian                                           April 12, 2020                                     CLOSEFROM(2)