release/1.0.0_cvs

1 files changed, 133 insertions, 0 deletions

diff --git a/lib/libc/gen/popen.c b/lib/libc/gen/popen.c
new file mode 100644
index 000000000000..b84b58849c8e
--- /dev/null
+++ b/lib/libc/gen/popen.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software written by Ken Arnold and
+ * published in UNIX Review, Vol. 6, No. 8.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)popen.c	5.15 (Berkeley) 2/23/91";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/signal.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <paths.h>
+
+static pid_t *pids;
+
+FILE *
+popen(program, type)
+	const char *program;
+	const char *type;
+{
+	FILE *iop;
+	int pdes[2], fds, pid;
+
+	if (*type != 'r' && *type != 'w' || type[1])
+		return (NULL);
+
+	if (pids == NULL) {
+		if ((fds = getdtablesize()) <= 0)
+			return (NULL);
+		if ((pids = (pid_t *)malloc((u_int)(fds * sizeof(int)))) == NULL)
+			return (NULL);
+		bzero((char *)pids, fds * sizeof(pid_t));
+	}
+	if (pipe(pdes) < 0)
+		return (NULL);
+	switch (pid = vfork()) {
+	case -1:			/* error */
+		(void) close(pdes[0]);
+		(void) close(pdes[1]);
+		return (NULL);
+		/* NOTREACHED */
+	case 0:				/* child */
+		if (*type == 'r') {
+			if (pdes[1] != STDOUT_FILENO) {
+				(void) dup2(pdes[1], STDOUT_FILENO);
+				(void) close(pdes[1]);
+			}
+			(void) close(pdes[0]);
+		} else {
+			if (pdes[0] != STDIN_FILENO) {
+				(void) dup2(pdes[0], STDIN_FILENO);
+				(void) close(pdes[0]);
+			}
+			(void) close(pdes[1]);
+		}
+		execl(_PATH_BSHELL, "sh", "-c", program, NULL);
+		_exit(127);
+		/* NOTREACHED */
+	}
+	/* parent; assume fdopen can't fail...  */
+	if (*type == 'r') {
+		iop = fdopen(pdes[0], type);
+		(void) close(pdes[1]);
+	} else {
+		iop = fdopen(pdes[1], type);
+		(void) close(pdes[0]);
+	}
+	pids[fileno(iop)] = pid;
+	return (iop);
+}
+
+int
+pclose(iop)
+	FILE *iop;
+{
+	register int fdes;
+	int omask;
+	union wait pstat;
+	pid_t pid;
+
+	/*
+	 * pclose returns -1 if stream is not associated with a
+	 * `popened' command, if already `pclosed', or waitpid
+	 * returns an error.
+	 */
+	if (pids == NULL || pids[fdes = fileno(iop)] == 0)
+		return (-1);
+	(void) fclose(iop);
+	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
+	do {
+		pid = waitpid(pids[fdes], (int *) &pstat, 0);
+	} while (pid == -1 && errno == EINTR);
+	(void) sigsetmask(omask);
+	pids[fdes] = 0;
+	return (pid == -1 ? -1 : pstat.w_status);
+}