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syscall: implement Pipe2 on Linux and use it in ForkExec

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Fixes #2656.

R=golang-dev, bradfitz, iant, minux.ma
CC=golang-dev
https://golang.org/cl/7062057
This commit is contained in:
Georg Reinke 2013-01-10 17:04:55 -08:00 • committed by Ian Lance Taylor
parent 6e981c181c
commit e32d1154ec
7 changed files with 74 additions and 7 deletions
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17
src/pkg/syscall/exec_linux.go
View file

@ -233,3 +233,20 @@ childerror:
// and this shuts up the compiler.
panic("unreached")
}
// Try to open a pipe with O_CLOEXEC set on both file descriptors.
func forkExecPipe(p []int) (err error) {
err = Pipe2(p, O_CLOEXEC)
// pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
// might not be implemented.
if err == ENOSYS {
if err = Pipe(p); err != nil {
return
}
if _, err = fcntl(p[0], F_SETFD, FD_CLOEXEC); err != nil {
return
}
_, err = fcntl(p[1], F_SETFD, FD_CLOEXEC)
}
return
}