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syscall: fix exec_bsd.go to accompany exec_linux.go changes

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exec_plan9.go too.
Those are in CL 8334044

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9055043
This commit is contained in:
Rob Pike 2013-04-30 11:52:15 -07:00
parent 5c0d782ab8
commit 479b1241b5
2 changed files with 16 additions and 3 deletions
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9
src/pkg/syscall/exec_bsd.go
View File

@ -39,10 +39,18 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
i int
)
// guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
darwin := runtime.GOOS == "darwin"
@ -131,7 +139,6 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
nextfd = int(len(fd))
if pipe < nextfd {
_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)
if err1 != 0 {

10
src/pkg/syscall/exec_plan9.go
View File

@ -183,11 +183,18 @@ func forkAndExecInChild(argv0 *byte, argv []*byte, envv []envItem, dir *byte, at
errbuf [ERRMAX]byte
)
// guard against side effects of shuffling fds below.
// Guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
if envv != nil {
clearenv = RFCENVG
@ -251,7 +258,6 @@ func forkAndExecInChild(argv0 *byte, argv []*byte, envv []envItem, dir *byte, at
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
nextfd = int(len(fd))
if pipe < nextfd {
r1, _, _ = RawSyscall(SYS_DUP, uintptr(pipe), uintptr(nextfd), 0)
if int32(r1) == -1 {