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authorIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
committerIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
commit3950ffe2a485479f6561c27364d3d7df5a21d124 (patch)
tree468c6e14449d1b1e279222ec32f676b0311917d2 /src/lib/libast/comp/setpgid.c
downloadksh-upstream.tar.gz
Imported Upstream version 93u+upstream
Diffstat (limited to 'src/lib/libast/comp/setpgid.c')
-rw-r--r--src/lib/libast/comp/setpgid.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/lib/libast/comp/setpgid.c b/src/lib/libast/comp/setpgid.c
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+++ b/src/lib/libast/comp/setpgid.c
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+/***********************************************************************
+* *
+* This software is part of the ast package *
+* Copyright (c) 1985-2011 AT&T Intellectual Property *
+* and is licensed under the *
+* Eclipse Public License, Version 1.0 *
+* by AT&T Intellectual Property *
+* *
+* A copy of the License is available at *
+* http://www.eclipse.org/org/documents/epl-v10.html *
+* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
+* *
+* Information and Software Systems Research *
+* AT&T Research *
+* Florham Park NJ *
+* *
+* Glenn Fowler <gsf@research.att.com> *
+* David Korn <dgk@research.att.com> *
+* Phong Vo <kpv@research.att.com> *
+* *
+***********************************************************************/
+#pragma prototyped
+
+#include <ast.h>
+
+#if _lib_setpgid
+
+NoN(setpgid)
+
+#else
+
+#include <error.h>
+
+#ifndef ENOSYS
+#define ENOSYS EINVAL
+#endif
+
+#if _lib_setpgrp2
+#define setpgrp setpgrp2
+#else
+#if _lib_BSDsetpgrp
+#define _lib_setpgrp2 1
+#define setpgrp BSDsetpgrp
+#else
+#if _lib_wait3
+#define _lib_setpgrp2 1
+#endif
+#endif
+#endif
+
+#if _lib_setpgrp2
+extern int setpgrp(int, int);
+#else
+extern int setpgrp(void);
+#endif
+
+/*
+ * set process group id
+ */
+
+int
+setpgid(pid_t pid, pid_t pgid)
+{
+#if _lib_setpgrp2
+ return(setpgrp(pid, pgid));
+#else
+#if _lib_setpgrp
+ int caller = getpid();
+
+ if ((pid == 0 || pid == caller) && (pgid == 0 || pgid == caller))
+ return(setpgrp());
+ errno = EINVAL;
+#else
+ errno = ENOSYS;
+#endif
+ return(-1);
+#endif
+}
+
+#endif