Written by: John H. Baldwin <jhb@FreeBSD.org>
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.Dd March 3, 2022 .Dt CLOSEFROM 2 .Os .Sh NAME .Nm closefrom , .Nm close_range .Nd delete open file descriptors .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft void .Fn closefrom "int lowfd" .Ft int .Fn close_range "u_int lowfd" "u_int highfd" "int flags" .Sh DESCRIPTION The .Fn closefrom system call deletes all open file descriptors greater than or equal to .Fa lowfd from the per-process object reference table. Any errors encountered while closing file descriptors are ignored.
p The .Fn close_range system call deletes all open file descriptors between .Fa lowfd and .Fa highfd inclusive, clamped to the range of open file descriptors. Any errors encountered while closing file descriptors are ignored. Supported .Fa flags : l -tag -width ".Dv CLOSE_RANGE_CLOEXEC" t Dv CLOSE_RANGE_CLOEXEC Set the close-on-exec flag on descriptors in the range instead of closing them. .El .Sh RETURN VALUES Upon successful completion, .Fn close_range returns a value of 0. Otherwise, a value of -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The .Fn close_range system call will fail if: l -tag -width Er t Bq Er EINVAL The .Fa highfd argument is lower than the .Fa lowfd argument. t Bq Er EINVAL An invalid flag was set. .El .Sh SEE ALSO .Xr close 2 .Sh HISTORY The .Fn closefrom function first appeared in .Fx 8.0 .