150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright 1998 by Albert Cahalan; all rights reserved.
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* Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <dirent.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "libbb.h"
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#define PROCPS_BUFSIZE 1024
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static int read_to_buf(const char *filename, void *buf)
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{
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int fd;
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ssize_t ret;
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fd = open(filename, O_RDONLY);
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if(fd < 0)
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return -1;
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ret = read(fd, buf, PROCPS_BUFSIZE);
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close(fd);
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return ret;
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}
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procps_status_t * procps_scan(int save_user_arg0)
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{
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static DIR *dir;
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struct dirent *entry;
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static procps_status_t ret_status;
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char *name;
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int n;
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char status[32];
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char *status_tail;
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char buf[PROCPS_BUFSIZE];
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procps_status_t curstatus;
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int pid;
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long tasknice;
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struct stat sb;
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if (!dir) {
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dir = bb_xopendir("/proc");
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}
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for(;;) {
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if((entry = readdir(dir)) == NULL) {
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closedir(dir);
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dir = 0;
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return 0;
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}
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name = entry->d_name;
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if (!(*name >= '0' && *name <= '9'))
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continue;
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memset(&curstatus, 0, sizeof(procps_status_t));
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pid = atoi(name);
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curstatus.pid = pid;
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status_tail = status + sprintf(status, "/proc/%d", pid);
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if(stat(status, &sb))
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continue;
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bb_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
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/* see proc(5) for some details on this */
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strcpy(status_tail, "/stat");
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n = read_to_buf(status, buf);
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if(n < 0)
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continue;
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name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
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if(name == 0 || name[1] != ' ')
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continue;
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*name = 0;
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sscanf(buf, "%*s (%15c", curstatus.short_cmd);
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n = sscanf(name+2,
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"%c %d "
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"%*s %*s %*s %*s " /* pgrp, session, tty, tpgid */
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"%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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"%lu %lu "
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#else
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"%*s %*s "
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#endif
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"%*s %*s %*s " /* cutime, cstime, priority */
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"%ld "
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"%*s %*s %*s " /* timeout, it_real_value, start_time */
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"%*s " /* vsize */
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"%ld",
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curstatus.state, &curstatus.ppid,
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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&curstatus.utime, &curstatus.stime,
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#endif
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&tasknice,
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&curstatus.rss);
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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if(n != 6)
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#else
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if(n != 4)
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#endif
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continue;
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if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
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curstatus.state[1] = 'W';
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else
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curstatus.state[1] = ' ';
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if (tasknice < 0)
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curstatus.state[2] = '<';
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else if (tasknice > 0)
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curstatus.state[2] = 'N';
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else
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curstatus.state[2] = ' ';
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#ifdef PAGE_SHIFT
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curstatus.rss <<= (PAGE_SHIFT - 10); /* 2**10 = 1kb */
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#else
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curstatus.rss *= (getpagesize() >> 10); /* 2**10 = 1kb */
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#endif
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if(save_user_arg0) {
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strcpy(status_tail, "/cmdline");
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n = read_to_buf(status, buf);
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if(n > 0) {
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if(buf[n-1]=='\n')
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buf[--n] = 0;
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name = buf;
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while(n) {
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if(((unsigned char)*name) < ' ')
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*name = ' ';
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name++;
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n--;
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}
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*name = 0;
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if(buf[0])
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curstatus.cmd = strdup(buf);
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/* if NULL it work true also */
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}
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}
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return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
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}
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}
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