From aad1a88c76f208d188fd061e3723bd637437e8d5 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 16 Mar 2001 22:47:14 +0000
Subject: Convert utility.c into libbb.a.  It is now a whole pile of .c files. 
 Clean up the resulting damage and fix up the makefile.  -Erik

---
 libbb/find_pid_by_name.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 libbb/find_pid_by_name.c

(limited to 'libbb/find_pid_by_name.c')

diff --git a/libbb/find_pid_by_name.c b/libbb/find_pid_by_name.c
new file mode 100644
index 000000000..a22ee1ff8
--- /dev/null
+++ b/libbb/find_pid_by_name.c
@@ -0,0 +1,168 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks.  Tracking down who wrote what
+ * isn't something I'm going to worry about...  If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include "libbb.h"
+
+
+/* For Erik's nifty devps device driver */
+#ifdef BB_FEATURE_USE_DEVPS_PATCH
+#include <linux/devps.h> 
+
+/* find_pid_by_name()
+ *  
+ *  This finds the pid of the specified process,
+ *  by using the /dev/ps device driver.
+ *
+ *  Returns a list of all matching PIDs
+ */
+extern pid_t* find_pid_by_name( char* pidName)
+{
+	int fd, i, j;
+	char device[] = "/dev/ps";
+	pid_t num_pids;
+	pid_t* pid_array = NULL;
+	pid_t* pidList=NULL;
+
+	/* open device */ 
+	fd = open(device, O_RDONLY);
+	if (fd < 0)
+		perror_msg_and_die("open failed for `%s'", device);
+
+	/* Find out how many processes there are */
+	if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0) 
+		perror_msg_and_die("\nDEVPS_GET_PID_LIST");
+	
+	/* Allocate some memory -- grab a few extras just in case 
+	 * some new processes start up while we wait. The kernel will
+	 * just ignore any extras if we give it too many, and will trunc.
+	 * the list if we give it too few.  */
+	pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
+	pid_array[0] = num_pids+10;
+
+	/* Now grab the pid list */
+	if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0) 
+		perror_msg_and_die("\nDEVPS_GET_PID_LIST");
+
+	/* Now search for a match */
+	for (i=1, j=0; i<pid_array[0] ; i++) {
+		char* p;
+		struct pid_info info;
+
+	    info.pid = pid_array[i];
+	    if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
+			perror_msg_and_die("\nDEVPS_GET_PID_INFO");
+
+		/* Make sure we only match on the process name */
+		p=info.command_line+1;
+		while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) { 
+			(p)++;
+		}
+		if (isspace(*(p)))
+				*p='\0';
+
+		if ((strstr(info.command_line, pidName) != NULL)
+				&& (strlen(pidName) == strlen(info.command_line))) {
+			pidList=xrealloc( pidList, sizeof(pid_t) * (j+2));
+			pidList[j++]=info.pid;
+		}
+	}
+	if (pidList)
+		pidList[j]=0;
+
+	/* Free memory */
+	free( pid_array);
+
+	/* close device */
+	if (close (fd) != 0) 
+		perror_msg_and_die("close failed for `%s'", device);
+
+	return pidList;
+}
+
+#else		/* BB_FEATURE_USE_DEVPS_PATCH */
+
+/* find_pid_by_name()
+ *  
+ *  This finds the pid of the specified process.
+ *  Currently, it's implemented by rummaging through 
+ *  the proc filesystem.
+ *
+ *  Returns a list of all matching PIDs
+ */
+extern pid_t* find_pid_by_name( char* pidName)
+{
+	DIR *dir;
+	struct dirent *next;
+	pid_t* pidList=NULL;
+	int i=0;
+
+	dir = opendir("/proc");
+	if (!dir)
+		perror_msg_and_die("Cannot open /proc");
+	
+	while ((next = readdir(dir)) != NULL) {
+		FILE *status;
+		char filename[256];
+		char buffer[256];
+
+		/* If it isn't a number, we don't want it */
+		if (!isdigit(*next->d_name))
+			continue;
+
+		sprintf(filename, "/proc/%s/cmdline", next->d_name);
+		status = fopen(filename, "r");
+		if (!status) {
+			continue;
+		}
+		fgets(buffer, 256, status);
+		fclose(status);
+
+		if (strstr(get_last_path_component(buffer), pidName) != NULL) {
+			pidList=xrealloc( pidList, sizeof(pid_t) * (i+2));
+			pidList[i++]=strtol(next->d_name, NULL, 0);
+		}
+	}
+
+	if (pidList)
+		pidList[i]=0;
+	return pidList;
+}
+#endif							/* BB_FEATURE_USE_DEVPS_PATCH */
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
-- 
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