mirror of
git://git.code.sf.net/p/cdesktopenv/code
synced 2025-03-09 15:50:02 +00:00
ca5803419b
This commit makes various different improvements to the documentation:
- sh.1: Backported (with changes) mandoc warning fixes from ksh2020
for the ksh93(1) man page: <https://github.com/att/ast/pull/1406>
- Removed unnecessary spaces at the end of lines to fix a few other
mandoc warnings.
- Fixed various typos and capitalization errors in the documentation.
- ANNOUNCE: Document the addition of the ${.sh.pid} variable
(re: 9de65210).
- libast/man/str*: Update the man pages for the libast str* functions
to improve how accurately each function is described.
- ksh93/README: Update regression test/compatibility notes to include
OpenBSD 7.0, FreeBSD 13.0 and WSL running Ubuntu 20.04.
- Change a few places to store the return value from strlen in a
size_t variable rather than signed int.
- comp/setlocale.c: To avoid confusion of two separate variables named
lang, the function local variable has been renamed to langidx.
199 lines
4.1 KiB
C
199 lines
4.1 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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/*
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* POSIX waitpid()
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*
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* PID < -1 WUNTRACED may not be fully supported
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* process group specifics ignored by non-{waitpid,wait4}
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*/
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#include <ast.h>
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#include <wait.h>
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#if _lib_waitpid
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NoN(waitpid)
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#else
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#if _lib_wait4
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struct rusage;
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extern int wait4(int, int*, int, struct rusage*);
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pid_t
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waitpid(pid_t pid, int* status, int flags)
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{
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return(wait4(pid, status, flags, NiL));
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}
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#else
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#undef SIGCLD
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#if _lib_wait3
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extern int wait3(int*, int, struct rusage*);
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#else
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#if _lib_wait2
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#define wait3(s,f,u) wait2(s,f)
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extern int wait2(int*, int);
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#else
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#include <sig.h>
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#define wait3(s,f,u) wait(s)
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static int caught;
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static void
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catch(sig)
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int sig;
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{
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NoP(sig);
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caught = 1;
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}
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#endif
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#endif
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#include <error.h>
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struct zombie
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{
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struct zombie* next;
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int status;
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pid_t pid;
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};
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pid_t
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waitpid(pid_t pid, int* status, int flags)
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{
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register struct zombie* zp;
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register struct zombie* pp;
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register int p;
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int s;
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#if !_lib_wait2 && !_lib_wait3
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#if !defined(SIGCLD)
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int n;
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int oerrno;
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#endif
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Sig_handler_t handler;
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#endif
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static struct zombie* zombies;
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pp = 0;
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zp = zombies;
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while (zp)
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{
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if (zp->pid >= 0 && (zp->pid == pid || pid <= 0))
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{
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if (pp) pp->next = zp->next;
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else zombies = zp->next;
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if (status) *status = zp->status;
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pid = zp->pid;
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free(zp);
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return(pid);
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}
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}
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if (pid > 0 && kill(pid, 0) < 0) return(-1);
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for (;;)
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{
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#if !_lib_wait2 && !_lib_wait3
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#if !defined(SIGCLD)
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oerrno = errno;
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#endif
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if (flags & WNOHANG)
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{
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caught = 0;
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#if defined(SIGCLD)
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handler = signal(SIGCLD, catch);
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if (!caught)
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{
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signal(SIGCLD, handler);
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return(0);
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}
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#else
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#if defined(SIGALRM)
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handler = signal(SIGALRM, catch);
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n = alarm(1);
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#endif
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#endif
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}
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#endif
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p = wait3(&s, flags, NiL);
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#if !_lib_wait3
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#if !_lib_wait2
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#if defined(SIGCLD)
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if (flags & WNOHANG) signal(SIGCLD, handler);
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#else
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#if defined(SIGALRM)
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if (flags & WNOHANG)
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{
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if (n == 0 && !caught || n == 1) alarm(n);
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else if (n > 1) alarm(n - caught);
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signal(SIGALRM, handler);
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}
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if (p == -1 && errno == EINTR)
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{
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errno = oerrno;
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p = 0;
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s = 0;
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}
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#endif
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#endif
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#else
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if (p == -1 && errno == EINVAL && (flags & ~WNOHANG))
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p = wait3(&s, flags & WNOHANG, NiL);
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#endif
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#endif
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if (p <= 0)
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{
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if (p == 0 && status) *status = s;
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return(p);
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}
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if (pid <= 0 || p == pid)
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{
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if (status) *status = s;
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return(p);
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}
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if (!(zp = newof(0, struct zombie, 1, 0))) return(-1);
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zp->pid = p;
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zp->status = s;
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zp->next = zombies;
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zombies = zp;
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}
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UNREACHABLE();
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}
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#endif
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#endif
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