Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
Den fredag 20 april 2018 kl. 16:11:36 UTC+2 skrev Ian Lance Taylor: > > On Fri, Apr 20, 2018 at 7:09 AM, Robert Bielik > wrote: > >> > >> Look at how os.Stdin and friends are initialized in os/file.go. > >> https://golang.org/src/os/file.go#L51 . > > > > > > Hmm... the syscall vars are platform specific. Is there a way to do this > > cross-platform ? > > > > Btw. the syntax worked on linux, but not Windows. > > File descriptors work differently on Windows. As I said upthread, I > was describing a mechanism for Unix. I don't know how to do this kind > of thing on Windows. > > Gotcha, thanx! -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
On Fri, Apr 20, 2018 at 7:09 AM, Robert Bielik wrote: >> >> Look at how os.Stdin and friends are initialized in os/file.go. >> https://golang.org/src/os/file.go#L51 . > > > Hmm... the syscall vars are platform specific. Is there a way to do this > cross-platform ? > > Btw. the syntax worked on linux, but not Windows. File descriptors work differently on Windows. As I said upthread, I was describing a mechanism for Unix. I don't know how to do this kind of thing on Windows. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
> > > Look at how os.Stdin and friends are initialized in os/file.go. > https://golang.org/src/os/file.go#L51 . > Hmm... the syscall vars are platform specific. Is there a way to do this cross-platform ? Btw. the syntax worked on linux, but not Windows. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
Ok, with the below syntax I managed to write to fd 4, and on the bash cmd line do 4>&2 to redirect to stdout. /R Den fredag 20 april 2018 kl. 15:03:41 UTC+2 skrev Robert Bielik: > > Exactly how would the call on the child side look ? > > file := os.NewFile(uintptr(3), "fd3") > > ? > > Den fredag 20 april 2018 kl. 14:54:29 UTC+2 skrev Ian Lance Taylor: >> >> On Fri, Apr 20, 2018 at 5:22 AM, Robert Bielik >> wrote: >> > >> > I have an application where I'd like to be able to pipe data in/out, >> but not >> > on stdin/stdout/err, but on other file descriptors. How to ? >> >> If you are on a Unix system, on the parent side see the ExtraFiles >> field of os/exec.Command, and on the child side see os.NewFile. >> >> Ian >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
On Fri, Apr 20, 2018 at 6:03 AM, Robert Bielik wrote: > > Exactly how would the call on the child side look ? > > file := os.NewFile(uintptr(3), "fd3") > > ? Yes (except that if you use a literal 3 note that Go constants are untyped so you don't need to use an explicit type conversion to uinptr). Look at how os.Stdin and friends are initialized in os/file.go. https://golang.org/src/os/file.go#L51 . Ian > Den fredag 20 april 2018 kl. 14:54:29 UTC+2 skrev Ian Lance Taylor: >> >> On Fri, Apr 20, 2018 at 5:22 AM, Robert Bielik >> wrote: >> > >> > I have an application where I'd like to be able to pipe data in/out, but >> > not >> > on stdin/stdout/err, but on other file descriptors. How to ? >> >> If you are on a Unix system, on the parent side see the ExtraFiles >> field of os/exec.Command, and on the child side see os.NewFile. >> >> Ian > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
Exactly how would the call on the child side look ? file := os.NewFile(uintptr(3), "fd3") ? Den fredag 20 april 2018 kl. 14:54:29 UTC+2 skrev Ian Lance Taylor: > > On Fri, Apr 20, 2018 at 5:22 AM, Robert Bielik > wrote: > > > > I have an application where I'd like to be able to pipe data in/out, but > not > > on stdin/stdout/err, but on other file descriptors. How to ? > > If you are on a Unix system, on the parent side see the ExtraFiles > field of os/exec.Command, and on the child side see os.NewFile. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Sending and receiving on file descr other than stdin/out/err
On Fri, Apr 20, 2018 at 5:22 AM, Robert Bielik wrote: > > I have an application where I'd like to be able to pipe data in/out, but not > on stdin/stdout/err, but on other file descriptors. How to ? If you are on a Unix system, on the parent side see the ExtraFiles field of os/exec.Command, and on the child side see os.NewFile. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
