| /* 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> |
| * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| |
| typedef struct unsigned_to_name_map_t { |
| long id; |
| char name[USERNAME_MAX_SIZE]; |
| } unsigned_to_name_map_t; |
| |
| typedef struct cache_t { |
| unsigned_to_name_map_t *cache; |
| int size; |
| } cache_t; |
| |
| static cache_t username, groupname; |
| |
| static void clear_cache(cache_t *cp) |
| { |
| free(cp->cache); |
| cp->cache = NULL; |
| cp->size = 0; |
| } |
| void FAST_FUNC clear_username_cache(void) |
| { |
| clear_cache(&username); |
| clear_cache(&groupname); |
| } |
| |
| #if 0 /* more generic, but we don't need that yet */ |
| /* Returns -N-1 if not found. */ |
| /* cp->cache[N] is allocated and must be filled in this case */ |
| static int get_cached(cache_t *cp, unsigned id) |
| { |
| int i; |
| for (i = 0; i < cp->size; i++) |
| if (cp->cache[i].id == id) |
| return i; |
| i = cp->size++; |
| cp->cache = xrealloc_vector(cp->cache, 2, i); |
| cp->cache[i++].id = id; |
| return -i; |
| } |
| #endif |
| |
| static char* get_cached(cache_t *cp, long id, |
| char* FAST_FUNC x2x_utoa(long id)) |
| { |
| int i; |
| for (i = 0; i < cp->size; i++) |
| if (cp->cache[i].id == id) |
| return cp->cache[i].name; |
| i = cp->size++; |
| cp->cache = xrealloc_vector(cp->cache, 2, i); |
| cp->cache[i].id = id; |
| /* Never fails. Generates numeric string if name isn't found */ |
| safe_strncpy(cp->cache[i].name, x2x_utoa(id), sizeof(cp->cache[i].name)); |
| return cp->cache[i].name; |
| } |
| const char* FAST_FUNC get_cached_username(uid_t uid) |
| { |
| return get_cached(&username, uid, uid2uname_utoa); |
| } |
| const char* FAST_FUNC get_cached_groupname(gid_t gid) |
| { |
| return get_cached(&groupname, gid, gid2group_utoa); |
| } |
| |
| |
| #define PROCPS_BUFSIZE 1024 |
| |
| static int read_to_buf(const char *filename, void *buf) |
| { |
| int fd; |
| /* open_read_close() would do two reads, checking for EOF. |
| * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */ |
| ssize_t ret = -1; |
| fd = open(filename, O_RDONLY); |
| if (fd >= 0) { |
| ret = read(fd, buf, PROCPS_BUFSIZE-1); |
| close(fd); |
| } |
| ((char *)buf)[ret > 0 ? ret : 0] = '\0'; |
| return ret; |
| } |
| |
| static procps_status_t* FAST_FUNC alloc_procps_scan(void) |
| { |
| unsigned n = getpagesize(); |
| procps_status_t* sp = xzalloc(sizeof(procps_status_t)); |
| sp->dir = xopendir("/proc"); |
| while (1) { |
| n >>= 1; |
| if (!n) break; |
| sp->shift_pages_to_bytes++; |
| } |
| sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10; |
| return sp; |
| } |
| |
| void FAST_FUNC free_procps_scan(procps_status_t* sp) |
| { |
| closedir(sp->dir); |
| #if ENABLE_FEATURE_SHOW_THREADS |
| if (sp->task_dir) |
| closedir(sp->task_dir); |
| #endif |
| free(sp->argv0); |
| free(sp->exe); |
| IF_SELINUX(free(sp->context);) |
| free(sp); |
| } |
| |
| #if ENABLE_FEATURE_TOPMEM |
| static unsigned long fast_strtoul_16(char **endptr) |
| { |
| unsigned char c; |
| char *str = *endptr; |
| unsigned long n = 0; |
| |
| while ((c = *str++) != ' ') { |
| c = ((c|0x20) - '0'); |
| if (c > 9) |
| // c = c + '0' - 'a' + 10: |
| c = c - ('a' - '0' - 10); |
| n = n*16 + c; |
| } |
| *endptr = str; /* We skip trailing space! */ |
| return n; |
| } |
| /* TOPMEM uses fast_strtoul_10, so... */ |
| # undef ENABLE_FEATURE_FAST_TOP |
| # define ENABLE_FEATURE_FAST_TOP 1 |
| #endif |
| |
| #if ENABLE_FEATURE_FAST_TOP |
| /* We cut a lot of corners here for speed */ |
| static unsigned long fast_strtoul_10(char **endptr) |
| { |
| char c; |
| char *str = *endptr; |
| unsigned long n = *str - '0'; |
| |
| while ((c = *++str) != ' ') |
| n = n*10 + (c - '0'); |
| |
| *endptr = str + 1; /* We skip trailing space! */ |
| return n; |
| } |
| |
| static long fast_strtol_10(char **endptr) |
| { |
| if (**endptr != '-') |
| return fast_strtoul_10(endptr); |
| |
| (*endptr)++; |
| return - (long)fast_strtoul_10(endptr); |
| } |
| |
| static char *skip_fields(char *str, int count) |
| { |
| do { |
| while (*str++ != ' ') |
| continue; |
| /* we found a space char, str points after it */ |
| } while (--count); |
| return str; |
| } |
| #endif |
| |
| void BUG_comm_size(void); |
| procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags) |
| { |
| struct dirent *entry; |
| char buf[PROCPS_BUFSIZE]; |
| char filename[sizeof("/proc//cmdline") + sizeof(int)*3]; |
| char *filename_tail; |
| long tasknice; |
| unsigned pid; |
| int n; |
| struct stat sb; |
| |
| if (!sp) |
| sp = alloc_procps_scan(); |
| |
| for (;;) { |
| #if ENABLE_FEATURE_SHOW_THREADS |
| if ((flags & PSSCAN_TASKS) && sp->task_dir) { |
| entry = readdir(sp->task_dir); |
| if (entry) |
| goto got_entry; |
| closedir(sp->task_dir); |
| sp->task_dir = NULL; |
| } |
| #endif |
| entry = readdir(sp->dir); |
| if (entry == NULL) { |
| free_procps_scan(sp); |
| return NULL; |
| } |
| IF_FEATURE_SHOW_THREADS(got_entry:) |
| pid = bb_strtou(entry->d_name, NULL, 10); |
| if (errno) |
| continue; |
| #if ENABLE_FEATURE_SHOW_THREADS |
| if ((flags & PSSCAN_TASKS) && !sp->task_dir) { |
| /* We found another /proc/PID. Do not use it, |
| * there will be /proc/PID/task/PID (same PID!), |
| * so just go ahead and dive into /proc/PID/task. */ |
| char task_dir[sizeof("/proc/%u/task") + sizeof(int)*3]; |
| sprintf(task_dir, "/proc/%u/task", pid); |
| sp->task_dir = xopendir(task_dir); |
| continue; |
| } |
| #endif |
| |
| /* After this point we can: |
| * "break": stop parsing, return the data |
| * "continue": try next /proc/XXX |
| */ |
| |
| memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz)); |
| |
| sp->pid = pid; |
| if (!(flags & ~PSSCAN_PID)) |
| break; /* we needed only pid, we got it */ |
| |
| #if ENABLE_SELINUX |
| if (flags & PSSCAN_CONTEXT) { |
| if (getpidcon(sp->pid, &sp->context) < 0) |
| sp->context = NULL; |
| } |
| #endif |
| |
| filename_tail = filename + sprintf(filename, "/proc/%u/", pid); |
| |
| if (flags & PSSCAN_UIDGID) { |
| if (stat(filename, &sb)) |
| continue; /* process probably exited */ |
| /* Effective UID/GID, not real */ |
| sp->uid = sb.st_uid; |
| sp->gid = sb.st_gid; |
| } |
| |
| if (flags & PSSCAN_STAT) { |
| char *cp, *comm1; |
| int tty; |
| #if !ENABLE_FEATURE_FAST_TOP |
| unsigned long vsz, rss; |
| #endif |
| /* see proc(5) for some details on this */ |
| strcpy(filename_tail, "stat"); |
| n = read_to_buf(filename, buf); |
| if (n < 0) |
| continue; /* process probably exited */ |
| cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */ |
| /*if (!cp || cp[1] != ' ') |
| continue;*/ |
| cp[0] = '\0'; |
| if (sizeof(sp->comm) < 16) |
| BUG_comm_size(); |
| comm1 = strchr(buf, '('); |
| /*if (comm1)*/ |
| safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm)); |
| |
| #if !ENABLE_FEATURE_FAST_TOP |
| n = sscanf(cp+2, |
| "%c %u " /* state, ppid */ |
| "%u %u %d %*s " /* pgid, sid, tty, tpgid */ |
| "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */ |
| "%lu %lu " /* utime, stime */ |
| "%*s %*s %*s " /* cutime, cstime, priority */ |
| "%ld " /* nice */ |
| "%*s %*s " /* timeout, it_real_value */ |
| "%lu " /* start_time */ |
| "%lu " /* vsize */ |
| "%lu " /* rss */ |
| # if ENABLE_FEATURE_TOP_SMP_PROCESS |
| "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */ |
| "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */ |
| "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */ |
| "%d" /*cpu last seen on*/ |
| # endif |
| , |
| sp->state, &sp->ppid, |
| &sp->pgid, &sp->sid, &tty, |
| &sp->utime, &sp->stime, |
| &tasknice, |
| &sp->start_time, |
| &vsz, |
| &rss |
| # if ENABLE_FEATURE_TOP_SMP_PROCESS |
| , &sp->last_seen_on_cpu |
| # endif |
| ); |
| |
| if (n < 11) |
| continue; /* bogus data, get next /proc/XXX */ |
| # if ENABLE_FEATURE_TOP_SMP_PROCESS |
| if (n < 11+15) |
| sp->last_seen_on_cpu = 0; |
| # endif |
| |
| /* vsz is in bytes and we want kb */ |
| sp->vsz = vsz >> 10; |
| /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */ |
| sp->rss = rss << sp->shift_pages_to_kb; |
| sp->tty_major = (tty >> 8) & 0xfff; |
| sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00); |
| #else |
| /* This costs ~100 bytes more but makes top faster by 20% |
| * If you run 10000 processes, this may be important for you */ |
| sp->state[0] = cp[2]; |
| cp += 4; |
| sp->ppid = fast_strtoul_10(&cp); |
| sp->pgid = fast_strtoul_10(&cp); |
| sp->sid = fast_strtoul_10(&cp); |
| tty = fast_strtoul_10(&cp); |
| sp->tty_major = (tty >> 8) & 0xfff; |
| sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00); |
| cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */ |
| sp->utime = fast_strtoul_10(&cp); |
| sp->stime = fast_strtoul_10(&cp); |
| cp = skip_fields(cp, 3); /* cutime, cstime, priority */ |
| tasknice = fast_strtol_10(&cp); |
| cp = skip_fields(cp, 2); /* timeout, it_real_value */ |
| sp->start_time = fast_strtoul_10(&cp); |
| /* vsz is in bytes and we want kb */ |
| sp->vsz = fast_strtoul_10(&cp) >> 10; |
| /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */ |
| sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb; |
| # if ENABLE_FEATURE_TOP_SMP_PROCESS |
| /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */ |
| /* (4): signal, blocked, sigignore, sigcatch */ |
| /* (4): wchan, nswap, cnswap, exit_signal */ |
| cp = skip_fields(cp, 14); |
| //FIXME: is it safe to assume this field exists? |
| sp->last_seen_on_cpu = fast_strtoul_10(&cp); |
| # endif |
| #endif /* end of !ENABLE_FEATURE_TOP_SMP_PROCESS */ |
| |
| #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS |
| sp->niceness = tasknice; |
| #endif |
| |
| if (sp->vsz == 0 && sp->state[0] != 'Z') |
| sp->state[1] = 'W'; |
| else |
| sp->state[1] = ' '; |
| if (tasknice < 0) |
| sp->state[2] = '<'; |
| else if (tasknice) /* > 0 */ |
| sp->state[2] = 'N'; |
| else |
| sp->state[2] = ' '; |
| } |
| |
| #if ENABLE_FEATURE_TOPMEM |
| if (flags & (PSSCAN_SMAPS)) { |
| FILE *file; |
| |
| strcpy(filename_tail, "smaps"); |
| file = fopen_for_read(filename); |
| if (file) { |
| while (fgets(buf, sizeof(buf), file)) { |
| unsigned long sz; |
| char *tp; |
| char w; |
| #define SCAN(str, name) \ |
| if (strncmp(buf, str, sizeof(str)-1) == 0) { \ |
| tp = skip_whitespace(buf + sizeof(str)-1); \ |
| sp->name += fast_strtoul_10(&tp); \ |
| continue; \ |
| } |
| SCAN("Shared_Clean:" , shared_clean ); |
| SCAN("Shared_Dirty:" , shared_dirty ); |
| SCAN("Private_Clean:", private_clean); |
| SCAN("Private_Dirty:", private_dirty); |
| #undef SCAN |
| // f7d29000-f7d39000 rw-s ADR M:m OFS FILE |
| tp = strchr(buf, '-'); |
| if (tp) { |
| *tp = ' '; |
| tp = buf; |
| sz = fast_strtoul_16(&tp); /* start */ |
| sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */ |
| // tp -> "rw-s" string |
| w = tp[1]; |
| // skipping "rw-s ADR M:m OFS " |
| tp = skip_whitespace(skip_fields(tp, 4)); |
| // filter out /dev/something (something != zero) |
| if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) { |
| if (w == 'w') { |
| sp->mapped_rw += sz; |
| } else if (w == '-') { |
| sp->mapped_ro += sz; |
| } |
| } |
| //else printf("DROPPING %s (%s)\n", buf, tp); |
| if (strcmp(tp, "[stack]\n") == 0) |
| sp->stack += sz; |
| } |
| } |
| fclose(file); |
| } |
| } |
| #endif /* TOPMEM */ |
| #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS |
| if (flags & PSSCAN_RUIDGID) { |
| FILE *file; |
| |
| strcpy(filename_tail, "status"); |
| file = fopen_for_read(filename); |
| if (file) { |
| while (fgets(buf, sizeof(buf), file)) { |
| char *tp; |
| #define SCAN_TWO(str, name, statement) \ |
| if (strncmp(buf, str, sizeof(str)-1) == 0) { \ |
| tp = skip_whitespace(buf + sizeof(str)-1); \ |
| sscanf(tp, "%u", &sp->name); \ |
| statement; \ |
| } |
| SCAN_TWO("Uid:", ruid, continue); |
| SCAN_TWO("Gid:", rgid, break); |
| #undef SCAN_TWO |
| } |
| fclose(file); |
| } |
| } |
| #endif /* PS_ADDITIONAL_COLUMNS */ |
| if (flags & PSSCAN_EXE) { |
| strcpy(filename_tail, "exe"); |
| free(sp->exe); |
| sp->exe = xmalloc_readlink(filename); |
| } |
| /* Note: if /proc/PID/cmdline is empty, |
| * code below "breaks". Therefore it must be |
| * the last code to parse /proc/PID/xxx data |
| * (we used to have /proc/PID/exe parsing after it |
| * and were getting stale sp->exe). |
| */ |
| #if 0 /* PSSCAN_CMD is not used */ |
| if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) { |
| free(sp->argv0); |
| sp->argv0 = NULL; |
| free(sp->cmd); |
| sp->cmd = NULL; |
| strcpy(filename_tail, "cmdline"); |
| /* TODO: to get rid of size limits, read into malloc buf, |
| * then realloc it down to real size. */ |
| n = read_to_buf(filename, buf); |
| if (n <= 0) |
| break; |
| if (flags & PSSCAN_ARGV0) |
| sp->argv0 = xstrdup(buf); |
| if (flags & PSSCAN_CMD) { |
| do { |
| n--; |
| if ((unsigned char)(buf[n]) < ' ') |
| buf[n] = ' '; |
| } while (n); |
| sp->cmd = xstrdup(buf); |
| } |
| } |
| #else |
| if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) { |
| free(sp->argv0); |
| sp->argv0 = NULL; |
| strcpy(filename_tail, "cmdline"); |
| n = read_to_buf(filename, buf); |
| if (n <= 0) |
| break; |
| if (flags & PSSCAN_ARGVN) { |
| sp->argv_len = n; |
| sp->argv0 = xmalloc(n + 1); |
| memcpy(sp->argv0, buf, n + 1); |
| /* sp->argv0[n] = '\0'; - buf has it */ |
| } else { |
| sp->argv_len = 0; |
| sp->argv0 = xstrdup(buf); |
| } |
| } |
| #endif |
| break; |
| } /* for (;;) */ |
| |
| return sp; |
| } |
| |
| void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm) |
| { |
| int sz; |
| char filename[sizeof("/proc//cmdline") + sizeof(int)*3]; |
| |
| sprintf(filename, "/proc/%u/cmdline", pid); |
| sz = open_read_close(filename, buf, col - 1); |
| if (sz > 0) { |
| buf[sz] = '\0'; |
| while (--sz >= 0 && buf[sz] == '\0') |
| continue; |
| do { |
| if ((unsigned char)(buf[sz]) < ' ') |
| buf[sz] = ' '; |
| } while (--sz >= 0); |
| } else { |
| snprintf(buf, col, "[%s]", comm); |
| } |
| } |
| |
| /* from kernel: |
| // pid comm S ppid pgid sid tty_nr tty_pgrp flg |
| sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \ |
| %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ |
| %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n", |
| task->pid, |
| tcomm, |
| state, |
| ppid, |
| pgid, |
| sid, |
| tty_nr, |
| tty_pgrp, |
| task->flags, |
| min_flt, |
| cmin_flt, |
| maj_flt, |
| cmaj_flt, |
| cputime_to_clock_t(utime), |
| cputime_to_clock_t(stime), |
| cputime_to_clock_t(cutime), |
| cputime_to_clock_t(cstime), |
| priority, |
| nice, |
| num_threads, |
| // 0, |
| start_time, |
| vsize, |
| mm ? get_mm_rss(mm) : 0, |
| rsslim, |
| mm ? mm->start_code : 0, |
| mm ? mm->end_code : 0, |
| mm ? mm->start_stack : 0, |
| esp, |
| eip, |
| the rest is some obsolete cruft |
| */ |