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CLOSEFROM(2) System Calls Manual CLOSEFROM(2)

closefrom
delete many descriptors

#include <unistd.h>

int
closefrom(int fd);

The closefrom() call deletes all descriptors numbered fd and higher from the per-process file descriptor table. It is effectively the same as calling close(2) on each descriptor.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

closefrom() will fail if:
[]
fd is greater than all open file descriptors.
[]
An interrupt was received.

close(2)

closefrom() is a BSD and Solaris extension.

The closefrom() function first appeared in Solaris 9 and has been available since OpenBSD 3.5.
May 31, 2019 OpenBSD-current