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* perthread.h (vfork_save): Add ctty, sid, pgid, exitval fields.

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(vfork_save::restore_pid): New method.
(vfork_save::restore_exit): New method.
* fork.cc (vfork): Save ctty, sid, pgid and restore them when returning to
"parent".  Use exitval field if exiting but never created a new process.
* syscalls.cc (setsid): Detect when in "vfork" and force an actual fork so that
pid will be allocated (UGLY!).
(getsid): New function.
* dcrt0.cc (do_exit): Use vfork_save::restore_exit method for returning from a
vfork.
* spawn.cc (spawnve): Use vfork_save::{restore_pid,restore_exit} methods for
returning from vfork.
* cygwin.din: Export getsid.
* include/cygwin/version.h: Bump api minor number.
* malloc.cc: #ifdef sYSTRIm for when MORECORE_CANNOT_TRIM is true.
This commit is contained in:
Christopher Faylor
2002-08-18 05:49:26 +00:00
parent d17ba05c1c
commit 8dca9e2302
9 changed files with 99 additions and 19 deletions
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45
winsup/cygwin/syscalls.cc
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@@ -36,6 +36,9 @@ details. */
#include <unistd.h>
#include "shared_info.h"
#include "cygheap.h"
#define NEED_VFORK
#include <setjmp.h>
#include "perthread.h"
SYSTEM_INFO system_info;
@@ -265,11 +268,24 @@ getppid ()
extern "C" pid_t
setsid (void)
{
if (myself->pgid != _getpid ())
vfork_save *vf = vfork_storage.val ();
/* This is a horrible, horrible kludge */
if (vf && vf->pid < 0)
{
if (myself->ctty == TTY_CONSOLE &&
!cygheap->fdtab.has_console_fds () &&
!check_pty_fds ())
pid_t pid = fork ();
if (pid > 0)
{
syscall_printf ("longjmping due to vfork");
vf->restore_pid (pid);
}
/* assuming that fork was successful */
}
if (myself->pgid != myself->pid)
{
if (myself->ctty == TTY_CONSOLE
&& !cygheap->fdtab.has_console_fds ()
&& !check_pty_fds ())
FreeConsole ();
myself->ctty = -1;
myself->sid = _getpid ();
@@ -277,10 +293,31 @@ setsid (void)
syscall_printf ("sid %d, pgid %d, ctty %d", myself->sid, myself->pgid, myself->ctty);
return myself->sid;
}
set_errno (EPERM);
return -1;
}
extern "C" pid_t
getsid (pid_t pid)
{
pid_t res;
if (!pid)
res = myself->sid;
else
{
pinfo p (pid);
if (p)
res = p->sid;
else
{
set_errno (ESRCH);
res = -1;
}
}
return res;
}
extern "C" ssize_t
_read (int fd, void *ptr, size_t len)
{