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syscall: Add Foreground and Pgid to SysProcAttr

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On Unix, when placing a child in a new process group, allow that group
to become the foreground process group. Also, allow a child process to
join a specific process group.

When setting the foreground process group, Ctty is used as the file
descriptor of the controlling terminal. Ctty has been added to the BSD
and Solaris SysProcAttr structures and the handling of Setctty changed
to match Linux.

Change-Id: I18d169a6c5ab8a6a90708c4ff52eb4aded50bc8c
Reviewed-on: https://go-review.googlesource.com/5130
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Michael MacInnis 2015-02-17 22:23:16 -05:00 • committed by Ian Lance Taylor
parent 5bf9249eda
commit f7befa43a3
7 changed files with 317 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

35
src/syscall/exec_solaris.go
View file

@ -12,9 +12,12 @@ type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
Setsid bool // Create session.
Setpgid bool // Set process group ID to new pid (SYSV setpgrp)
Setctty bool // Set controlling terminal to fd 0
Setpgid bool // Set process group ID to Pgid, or, if Pgid == 0, to new pid.
Setctty bool // Set controlling terminal to fd Ctty
Noctty bool // Detach fd 0 from controlling terminal
Ctty int // Controlling TTY fd
Foreground bool // Place child's process group in foreground. (Implies Setpgid. Uses Ctty as fd of controlling TTY)
Pgid int // Child's process group ID if Setpgid.
}
// Implemented in runtime package.
@ -28,6 +31,7 @@ func execve(path uintptr, argv uintptr, envp uintptr) (err Errno)
func exit(code uintptr)
func fcntl1(fd uintptr, cmd uintptr, arg uintptr) (val uintptr, err Errno)
func forkx(flags uintptr) (pid uintptr, err Errno)
func getpid() (pid uintptr, err Errno)
func ioctl(fd uintptr, req uintptr, arg uintptr) (err Errno)
func setgid(gid uintptr) (err Errno)
func setgroups1(ngid uintptr, gid uintptr) (err Errno)
@ -97,8 +101,27 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
}
// Set process group
if sys.Setpgid {
err1 = setpgid(0, 0)
if sys.Setpgid || sys.Foreground {
// Place child in process group.
err1 = setpgid(0, uintptr(sys.Pgid))
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
pgrp := sys.Pgid
if pgrp == 0 {
r1, err1 = getpid()
if err1 != 0 {
goto childerror
}
pgrp = int(r1)
}
// Place process group in foreground.
err1 = ioctl(uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
@ -206,9 +229,9 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
}
}
// Make fd 0 the tty
// Set the controlling TTY to Ctty
if sys.Setctty {
err1 = ioctl(0, uintptr(TIOCSCTTY), 0)
err1 = ioctl(uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
if err1 != 0 {
goto childerror
}