How do I clear the close-on-exec checkbox?
When os.OpenFile is called on Centos6, the O_CLOEXEC flag is set on the file descriptor. I don't think there is a way to avoid setting the flag. For example, the following call:
f, err := os.OpenFile( "lockfile", os.O_CREATE|os.O_RDWR, 0666 )
as follows:
[pid 2928] open("lockfile", O_RDWR|O_CREAT|O_CLOEXEC, 0666) = 3
syscall.CloseOnExec is provided to set the close-on-exec flag for a given file descriptor, but I cannot find an appropriate function to clear the close-on-exec flag.
How can I remove the close-on-exec flag for a file?
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1 answer
I found a hint at https://golang.org/src/pkg/syscall/exec_linux.go :
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
Elsewhere, I read that I should be using Syscall and not RawSyscall , and so I rewrote it as:
_, _, err = syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), syscall.F_SETFD, 0)
if err != syscall.Errno(0x0) {
log.Fatal(err)
}
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