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fallocate_linux.go
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fallocate_linux.go
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package main
import (
"flag"
"fmt"
"os"
"syscall"
"github.com/u35s/busybox/libbb"
)
func (app *applets) Applet_fallocate(args []string) {
var set = flag.NewFlagSet("fallocate [options] <filename>", flag.ExitOnError)
var lflag = set.String("l", "", "length of the allocation, in bytes")
var oflag = set.String("o", "", "offset of the allocation, in bytes")
set.Parse(args[1:])
args = set.Args()
var retval int
if *lflag == "" {
fmt.Fprintf(os.Stderr, "%v\n", "fallocate: no length argument specified")
retval = 1
} else if len(args) != 1 {
fmt.Fprintf(os.Stderr, "%v\n", "fallocate: no filename specified")
retval = 1
} else {
var (
offset int64
length int64
file *os.File
err error
)
length = libbb.Atoi_sfx(*lflag, libbb.Suffixes_kmg_i)
offset = libbb.Atoi_sfx(*oflag, libbb.Suffixes_kmg_i)
file, err = os.OpenFile(args[0], os.O_RDWR|os.O_CREATE, 0666)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
retval = 1
} else {
err = syscall.Fallocate(int(file.Fd()), 0, offset, length)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
retval = 1
}
file.Close()
}
}
os.Exit(retval)
}