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posix: Remove posix waitid

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The POSIX waitid implementation is problematic in some ways:

  - It emulates using waitpid, which default implementation calls
    wait4 and wait4 returns ENOSYS as default.

  - Also by using waitpid it does not allod support the WNOWAIT,
    WEXITED, WSTOPPED, or WCONTINUED flag.  With current POSIX
    specification the flags are no longer marked as optional.

Also due BZ#23091 Hurd still uses the implementation, so it is moved
to as a Hurd arch-specific folder (with some minor cleanups).

Checked against a i686-gnu (run-built-tests=no)
This commit is contained in:
Adhemerval Zanella 2019-11-19 18:34:19 -03:00
parent b3b6a40ab9
commit 6437fecca3
1 changed files with 9 additions and 61 deletions
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70
sysdeps/posix/waitid.c → sysdeps/mach/hurd/waitid.c
View File

@ -17,25 +17,11 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <signal.h>
#define __need_NULL
#include <stddef.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sysdep-cancel.h>
#ifdef DO_WAITID
# define OUR_WAITID DO_WAITID
#elif !defined NO_DO_WAITID
# define OUR_WAITID do_waitid
#endif
#ifdef OUR_WAITID
static int
OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
int
__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
pid_t pid, child;
int status;
@ -43,7 +29,7 @@ OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
switch (idtype)
{
case P_PID:
if(id <= 0)
if (id <= 0)
goto invalid;
pid = (pid_t) id;
break;
@ -72,31 +58,10 @@ OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
return -1;
}
/* This emulation using waitpid cannot support the waitid modes in which
we do not reap the child, or match only stopped and not dead children. */
if (0
#ifdef WNOWAIT
|| (options & WNOWAIT)
#endif
#ifdef WEXITED
|| ((options & (WEXITED|WSTOPPED|WCONTINUED))
!= (WEXITED | (options & WSTOPPED)))
#endif
)
{
__set_errno (ENOTSUP);
return -1;
}
/* Note the waitid() is a cancellation point. But since we call
waitpid() which itself is a cancellation point we do not have
to do anything here. */
child = __waitpid (pid, &status,
options
#ifdef WEXITED
&~ WEXITED
#endif
);
child = __waitpid (pid, &status, options);
if (child == -1)
/* `waitpid' set `errno' for us. */
@ -104,9 +69,11 @@ OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
if (child == 0)
{
/* The WHOHANG bit in OPTIONS is set and there are children available
but none has a status for us. The XPG docs do not mention this
case so we clear the `siginfo_t' struct and return successfully. */
/* POSIX.1-2008, Technical Corrigendum 1 XSH/TC1-2008/0713 [153] states
that if waitid returns because WNOHANG was specified and status is
not available for any process specified by idtype and id, then the
si_signo and si_pid members of the structure pointed to by infop
shall be set to zero. */
infop->si_signo = 0;
infop->si_code = 0;
return 0;
@ -132,27 +99,8 @@ OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
infop->si_code = CLD_STOPPED;
infop->si_status = WSTOPSIG (status);
}
#ifdef WIFCONTINUED
else if (WIFCONTINUED (status))
{
infop->si_code = CLD_CONTINUED;
infop->si_status = SIGCONT;
}
#endif
else
/* Can't happen. */
assert (! "What?");
return 0;
}
#endif
int
__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
/* __waitpid should be a cancellation point. */
return do_waitid (idtype, id, infop, options);
}
weak_alias (__waitid, waitid)
strong_alias (__waitid, __libc_waitid)