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authorEric Andersen2001-03-16 22:47:14 +0000
committerEric Andersen2001-03-16 22:47:14 +0000
commitaad1a88c76f208d188fd061e3723bd637437e8d5 (patch)
tree75ac2b994f7f04af776e93eeedba82b873ff557e /libbb/find_pid_by_name.c
parentdfba13d199bb58d802df99c1ef20fdc0d628e86d (diff)
downloadbusybox-aad1a88c76f208d188fd061e3723bd637437e8d5.zip
busybox-aad1a88c76f208d188fd061e3723bd637437e8d5.tar.gz
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
Diffstat (limited to 'libbb/find_pid_by_name.c')
-rw-r--r--libbb/find_pid_by_name.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/libbb/find_pid_by_name.c b/libbb/find_pid_by_name.c
new file mode 100644
index 0000000..a22ee1f
--- /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:
+*/