Patch last_pach62 from vodz. This patch moves all the /proc parsing

code into libbb so it can be shared by ps, top, etc, saving over 1.5k.
2002-10-22 12:21:15 +00:00
parent 1887b0478f
commit 44608e9693
8 changed files with 223 additions and 315 deletions
--- a/libbb/procps.c
+++ b/libbb/procps.c
@ -0,0 +1,137 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright 1998 by Albert Cahalan; all rights reserved.
+ * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
+ * GNU Library General Public License Version 2, or any later version
+ *
+ */
+
+#include "libbb.h"
+
+#if ! defined CONFIG_FEATURE_USE_DEVPS_PATCH
+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <asm/page.h>
+
+
+extern procps_status_t * procps_scan(int save_user_arg0)
+{
+	static DIR *dir;
+	struct dirent *entry;
+	static procps_status_t ret_status;
+	char *name;
+	int n;
+	char status[32];
+	char buf[1024];
+	FILE *fp;
+	procps_status_t curstatus;
+	int pid;
+	long tasknice;
+	struct stat sb;
+
+	if (!dir) {
+		dir = opendir("/proc");
+		if(!dir)
+			error_msg_and_die("Can't open /proc");
+	}
+	for(;;) {
+		if((entry = readdir(dir)) == NULL) {
+			closedir(dir);
+			dir = 0;
+			return 0;
+		}
+		name = entry->d_name;
+		if (!(*name >= '0' && *name <= '9'))
+			continue;
+
+		memset(&curstatus, 0, sizeof(procps_status_t));
+		pid = atoi(name);
+		curstatus.pid = pid;
+
+		sprintf(status, "/proc/%d/stat", pid);
+		if((fp = fopen(status, "r")) == NULL)
+			continue;
+		if(fstat(fileno(fp), &sb))
+			continue;
+		my_getpwuid(curstatus.user, sb.st_uid);
+		name = fgets(buf, sizeof(buf), fp);
+		fclose(fp);
+		if(name == NULL)
+			continue;
+		name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
+		if(name == 0 || name[1] != ' ')
+			continue;
+		*name = 0;
+		sscanf(buf, "%*s (%15c", curstatus.short_cmd);
+		n = sscanf(name+2,
+		"%c %d "
+		"%*s %*s %*s %*s "     /* pgrp, session, tty, tpgid */
+		"%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
+#ifdef FEATURE_CPU_USAGE_PERCENTAGE
+		"%lu %lu "
+#else
+		"%*s %*s "
+#endif
+		"%*s %*s %*s "         /* cutime, cstime, priority */
+		"%ld "
+		"%*s %*s %*s "         /* timeout, it_real_value, start_time */
+		"%*s "                 /* vsize */
+		"%ld",
+		curstatus.state, &curstatus.ppid,
+#ifdef FEATURE_CPU_USAGE_PERCENTAGE
+		&curstatus.utime, &curstatus.stime,
+#endif
+		&tasknice,
+		&curstatus.rss);
+#ifdef FEATURE_CPU_USAGE_PERCENTAGE
+		if(n != 6)
+#else
+		if(n != 4)
+#endif
+			continue;
+
+		if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
+			curstatus.state[1] = 'W';
+		else
+			curstatus.state[1] = ' ';
+		if (tasknice < 0)
+			curstatus.state[2] = '<';
+		else if (tasknice > 0)
+			curstatus.state[2] = 'N';
+		else
+			curstatus.state[2] = ' ';
+
+		curstatus.rss <<= (PAGE_SHIFT - 10);     /* 2**10 = 1kb */
+
+		sprintf(status, "/proc/%d/cmdline", pid);
+		if(save_user_arg0) {
+			if((fp = fopen(status, "r")) == NULL)
+				continue;
+			if(fgets(buf, sizeof(buf), fp) != NULL) {
+				name = strchr(buf, '\n');
+				if(name != NULL)
+					*name = 0;
+				if(buf[0])
+					curstatus.cmd = strdup(buf);
+				/* if NULL it work true also */
+			}
+			fclose(fp);
+		}
+		return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
+	}
+}
+
+#endif /* CONFIG_FEATURE_USE_DEVPS_PATCH. Else this file is empty */
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/