source: MondoRescue/branches/stable/mindi-busybox/libbb/procps.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 12 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 8.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright 1998 by Albert Cahalan; all rights reserved.
6 * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
7 * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 */
11
12#include "libbb.h"
13
14
15typedef struct unsigned_to_name_map_t {
16    unsigned id;
17    char name[USERNAME_MAX_SIZE];
18} unsigned_to_name_map_t;
19
20typedef struct cache_t {
21    unsigned_to_name_map_t *cache;
22    int size;
23} cache_t;
24
25static cache_t username, groupname;
26
27static void clear_cache(cache_t *cp)
28{
29    free(cp->cache);
30    cp->cache = NULL;
31    cp->size = 0;
32}
33void clear_username_cache(void)
34{
35    clear_cache(&username);
36    clear_cache(&groupname);
37}
38
39#if 0 /* more generic, but we don't need that yet */
40/* Returns -N-1 if not found. */
41/* cp->cache[N] is allocated and must be filled in this case */
42static int get_cached(cache_t *cp, unsigned id)
43{
44    int i;
45    for (i = 0; i < cp->size; i++)
46        if (cp->cache[i].id == id)
47            return i;
48    i = cp->size++;
49    cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
50    cp->cache[i++].id = id;
51    return -i;
52}
53#endif
54
55typedef char* ug_func(char *name, int bufsize, long uid);
56static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
57{
58    int i;
59    for (i = 0; i < cp->size; i++)
60        if (cp->cache[i].id == id)
61            return cp->cache[i].name;
62    i = cp->size++;
63    cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
64    cp->cache[i].id = id;
65    /* Never fails. Generates numeric string if name isn't found */
66    fp(cp->cache[i].name, sizeof(cp->cache[i].name), id);
67    return cp->cache[i].name;
68}
69const char* get_cached_username(uid_t uid)
70{
71    return get_cached(&username, uid, bb_getpwuid);
72}
73const char* get_cached_groupname(gid_t gid)
74{
75    return get_cached(&groupname, gid, bb_getgrgid);
76}
77
78
79#define PROCPS_BUFSIZE 1024
80
81static int read_to_buf(const char *filename, void *buf)
82{
83    int fd;
84    /* open_read_close() would do two reads, checking for EOF.
85     * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
86    ssize_t ret = -1;
87    fd = open(filename, O_RDONLY);
88    if (fd >= 0) {
89        ret = read(fd, buf, PROCPS_BUFSIZE-1);
90        close(fd);
91    }
92    ((char *)buf)[ret > 0 ? ret : 0] = '\0';
93    return ret;
94}
95
96procps_status_t *alloc_procps_scan(int flags)
97{
98    procps_status_t* sp = xzalloc(sizeof(procps_status_t));
99    sp->dir = xopendir("/proc");
100    return sp;
101}
102
103void free_procps_scan(procps_status_t* sp)
104{
105    closedir(sp->dir);
106    free(sp->argv0);
107    USE_SELINUX(free(sp->context);)
108    free(sp);
109}
110
111#if ENABLE_FEATURE_FAST_TOP
112/* We cut a lot of corners here for speed */
113static unsigned long fast_strtoul_10(char **endptr)
114{
115    char c;
116    char *str = *endptr;
117    unsigned long n = *str - '0';
118
119    while ((c = *++str) != ' ')
120        n = n*10 + (c - '0');
121
122    *endptr = str + 1; /* We skip trailing space! */
123    return n;
124}
125static char *skip_fields(char *str, int count)
126{
127    do {
128        while (*str++ != ' ')
129            continue;
130        /* we found a space char, str points after it */
131    } while (--count);
132    return str;
133}
134#endif
135
136void BUG_comm_size(void);
137procps_status_t *procps_scan(procps_status_t* sp, int flags)
138{
139    struct dirent *entry;
140    char buf[PROCPS_BUFSIZE];
141    char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
142    char *filename_tail;
143    long tasknice;
144    unsigned pid;
145    int n;
146    struct stat sb;
147
148    if (!sp)
149        sp = alloc_procps_scan(flags);
150
151    for (;;) {
152        entry = readdir(sp->dir);
153        if (entry == NULL) {
154            free_procps_scan(sp);
155            return NULL;
156        }
157        pid = bb_strtou(entry->d_name, NULL, 10);
158        if (errno)
159            continue;
160
161        /* After this point we have to break, not continue
162         * ("continue" would mean that current /proc/NNN
163         * is not a valid process info) */
164
165        memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
166
167        sp->pid = pid;
168        if (!(flags & ~PSSCAN_PID)) break;
169
170#if ENABLE_SELINUX
171        if (flags & PSSCAN_CONTEXT) {
172            if (getpidcon(sp->pid, &sp->context) < 0)
173                sp->context = NULL;
174        }
175#endif
176
177        filename_tail = filename + sprintf(filename, "/proc/%d", pid);
178
179        if (flags & PSSCAN_UIDGID) {
180            if (stat(filename, &sb))
181                break;
182            /* Need comment - is this effective or real UID/GID? */
183            sp->uid = sb.st_uid;
184            sp->gid = sb.st_gid;
185        }
186
187        if (flags & PSSCAN_STAT) {
188            char *cp, *comm1;
189            int tty;
190#if !ENABLE_FEATURE_FAST_TOP
191            unsigned long vsz, rss;
192#endif
193
194            /* see proc(5) for some details on this */
195            strcpy(filename_tail, "/stat");
196            n = read_to_buf(filename, buf);
197            if (n < 0)
198                break;
199            cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
200            /*if (!cp || cp[1] != ' ')
201                break;*/
202            cp[0] = '\0';
203            if (sizeof(sp->comm) < 16)
204                BUG_comm_size();
205            comm1 = strchr(buf, '(');
206            /*if (comm1)*/
207                safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
208
209#if !ENABLE_FEATURE_FAST_TOP
210            n = sscanf(cp+2,
211                "%c %u "               /* state, ppid */
212                "%u %u %d %*s "        /* pgid, sid, tty, tpgid */
213                "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
214                "%lu %lu "             /* utime, stime */
215                "%*s %*s %*s "         /* cutime, cstime, priority */
216                "%ld "                 /* nice */
217                "%*s %*s %*s "         /* timeout, it_real_value, start_time */
218                "%lu "                 /* vsize */
219                "%lu "                 /* rss */
220            /*  "%lu %lu %lu %lu %lu %lu " rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
221            /*  "%u %u %u %u "         signal, blocked, sigignore, sigcatch */
222            /*  "%lu %lu %lu"          wchan, nswap, cnswap */
223                ,
224                sp->state, &sp->ppid,
225                &sp->pgid, &sp->sid, &tty,
226                &sp->utime, &sp->stime,
227                &tasknice,
228                &vsz,
229                &rss);
230            if (n != 10)
231                break;
232            sp->vsz = vsz >> 10; /* vsize is in bytes and we want kb */
233            sp->rss = rss >> 10;
234            sp->tty_major = (tty >> 8) & 0xfff;
235            sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
236#else
237/* This costs ~100 bytes more but makes top faster by 20%
238 * If you run 10000 processes, this may be important for you */
239            sp->state[0] = cp[2];
240            cp += 4;
241            sp->ppid = fast_strtoul_10(&cp);
242            sp->pgid = fast_strtoul_10(&cp);
243            sp->sid = fast_strtoul_10(&cp);
244            tty = fast_strtoul_10(&cp);
245            sp->tty_major = (tty >> 8) & 0xfff;
246            sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
247            cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
248            sp->utime = fast_strtoul_10(&cp);
249            sp->stime = fast_strtoul_10(&cp);
250            cp = skip_fields(cp, 3); /* cutime, cstime, priority */
251            tasknice = fast_strtoul_10(&cp);
252            cp = skip_fields(cp, 3); /* timeout, it_real_value, start_time */
253            sp->vsz = fast_strtoul_10(&cp) >> 10; /* vsize is in bytes and we want kb */
254            sp->rss = fast_strtoul_10(&cp) >> 10;
255#endif
256
257            if (sp->vsz == 0 && sp->state[0] != 'Z')
258                sp->state[1] = 'W';
259            else
260                sp->state[1] = ' ';
261            if (tasknice < 0)
262                sp->state[2] = '<';
263            else if (tasknice) /* > 0 */
264                sp->state[2] = 'N';
265            else
266                sp->state[2] = ' ';
267
268        }
269
270#if 0 /* PSSCAN_CMD is not used */
271        if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
272            if (sp->argv0) {
273                free(sp->argv0);
274                sp->argv0 = NULL;
275            }
276            if (sp->cmd) {
277                free(sp->cmd);
278                sp->cmd = NULL;
279            }
280            strcpy(filename_tail, "/cmdline");
281            /* TODO: to get rid of size limits, read into malloc buf,
282             * then realloc it down to real size. */
283            n = read_to_buf(filename, buf);
284            if (n <= 0)
285                break;
286            if (flags & PSSCAN_ARGV0)
287                sp->argv0 = xstrdup(buf);
288            if (flags & PSSCAN_CMD) {
289                do {
290                    n--;
291                    if ((unsigned char)(buf[n]) < ' ')
292                        buf[n] = ' ';
293                } while (n);
294                sp->cmd = xstrdup(buf);
295            }
296        }
297#else
298        if (flags & PSSCAN_ARGV0) {
299            if (sp->argv0) {
300                free(sp->argv0);
301                sp->argv0 = NULL;
302            }
303            strcpy(filename_tail, "/cmdline");
304            n = read_to_buf(filename, buf);
305            if (n <= 0)
306                break;
307            if (flags & PSSCAN_ARGV0)
308                sp->argv0 = xstrdup(buf);
309        }
310#endif
311        break;
312    }
313    return sp;
314}
315
316void read_cmdline(char *buf, int col, unsigned pid, const char *comm)
317{
318    ssize_t sz;
319    char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
320
321    sprintf(filename, "/proc/%u/cmdline", pid);
322    sz = open_read_close(filename, buf, col);
323    if (sz > 0) {
324        buf[sz] = '\0';
325        while (--sz >= 0)
326            if ((unsigned char)(buf[sz]) < ' ')
327                buf[sz] = ' ';
328    } else {
329        snprintf(buf, col, "[%s]", comm);
330    }
331}
332
333/* from kernel:
334    //             pid comm S ppid pgid sid tty_nr tty_pgrp flg
335    sprintf(buffer,"%d (%s) %c %d  %d   %d  %d     %d       %lu %lu \
336%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
337%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
338        task->pid,
339        tcomm,
340        state,
341        ppid,
342        pgid,
343        sid,
344        tty_nr,
345        tty_pgrp,
346        task->flags,
347        min_flt,
348        cmin_flt,
349        maj_flt,
350        cmaj_flt,
351        cputime_to_clock_t(utime),
352        cputime_to_clock_t(stime),
353        cputime_to_clock_t(cutime),
354        cputime_to_clock_t(cstime),
355        priority,
356        nice,
357        num_threads,
358        // 0,
359        start_time,
360        vsize,
361        mm ? get_mm_rss(mm) : 0,
362        rsslim,
363        mm ? mm->start_code : 0,
364        mm ? mm->end_code : 0,
365        mm ? mm->start_stack : 0,
366        esp,
367        eip,
368the rest is some obsolete cruft
369*/
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