forked from iknite/KataJuez
/
006-golang-mmap.go
66 lines (55 loc) · 1.19 KB
/
006-golang-mmap.go
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package main
import (
"bytes"
"log"
"os"
"syscall"
)
func main() {
file1 := os.Args[1]
f1, err := os.Open(os.Args[1])
if err != nil {
log.Fatalf("could not open %v: %v", file1, err)
}
defer func() {
if err := f1.Close(); err != nil {
log.Panic(err)
}
}()
f1info, err := f1.Stat()
if err != nil {
log.Fatalf("could not Stat() %v: %v", file1, err)
}
file2 := os.Args[2]
f2, err := os.Open(os.Args[2])
if err != nil {
log.Fatalf("could not open %v: %v", file2, err)
}
defer func() {
if err := f2.Close(); err != nil {
log.Panic(err)
}
}()
f2info, err := f2.Stat()
if err != nil {
log.Fatalf("could not Stat() %v: %v", file2, err)
}
if f1info.Size() != f2info.Size() {
os.Exit(1)
}
mmap1, err := syscall.Mmap(int(f1.Fd()), 0, int(f1info.Size()), syscall.PROT_READ, syscall.MAP_SHARED)
if err != nil {
log.Fatalf("Could not mmap() %v: %v", file1, err)
}
defer syscall.Munmap(mmap1)
mmap2, err := syscall.Mmap(int(f2.Fd()), 0, int(f2info.Size()), syscall.PROT_READ, syscall.MAP_SHARED)
if err != nil {
log.Fatalf("Could not mmap() %v: %v", file2, err)
}
defer syscall.Munmap(mmap2)
if bytes.Equal(mmap1, mmap2) {
os.Exit(0)
} else {
os.Exit(1)
}
}