diff options
| -rw-r--r-- | miscutils/nmeter.c | 137 |
1 files changed, 89 insertions, 48 deletions
diff --git a/miscutils/nmeter.c b/miscutils/nmeter.c index e15cc8c71..3152b74e3 100644 --- a/miscutils/nmeter.c +++ b/miscutils/nmeter.c @@ -17,33 +17,67 @@ typedef unsigned long long ullong; -enum { proc_file_size = 4096 }; +enum { PROC_FILE_SIZE = 4096 }; typedef struct proc_file { - const char *name; - int gen; char *file; + //const char *name; + smallint last_gen; } proc_file; -static proc_file proc_stat = { "/proc/stat", -1 }; -static proc_file proc_loadavg = { "/proc/loadavg", -1 }; -static proc_file proc_net_dev = { "/proc/net/dev", -1 }; -static proc_file proc_meminfo = { "/proc/meminfo", -1 }; -static proc_file proc_diskstats = { "/proc/diskstats", -1 }; -// Sample # -static int gen = -1; -// Linux 2.6? (otherwise assumes 2.4) -static int is26 = 0; -static struct timeval tv; -static int delta = 1000000; -static int deltanz = 1000000; -static int need_seconds = 0; -static const char *final_str = "\n"; +static const char *const proc_name[] = { + "stat", // Must match the order of proc_file's! + "loadavg", + "net/dev", + "meminfo", + "diskstats", + "sys/fs/file-nr", +}; + +struct globals { + // Sample generation flip-flop + smallint gen; + // Linux 2.6? (otherwise assumes 2.4) + smallint is26; + // 1 if sample delay is not an integer fraction of a second + smallint need_seconds; + char *cur_outbuf; + const char *final_str; + int delta; + int deltanz; + struct timeval tv; +#define first_proc_file proc_stat + proc_file proc_stat; // Must match the order of proc_name's! + proc_file proc_loadavg; + proc_file proc_net_dev; + proc_file proc_meminfo; + proc_file proc_diskstats; + proc_file proc_sys_fs_filenr; +}; +#define G (*ptr_to_globals) +#define gen (G.gen ) +#define is26 (G.is26 ) +#define need_seconds (G.need_seconds ) +#define cur_outbuf (G.cur_outbuf ) +#define final_str (G.final_str ) +#define delta (G.delta ) +#define deltanz (G.deltanz ) +#define tv (G.tv ) +#define proc_stat (G.proc_stat ) +#define proc_loadavg (G.proc_loadavg ) +#define proc_net_dev (G.proc_net_dev ) +#define proc_meminfo (G.proc_meminfo ) +#define proc_diskstats (G.proc_diskstats ) +#define proc_sys_fs_filenr (G.proc_sys_fs_filenr) // We depend on this being a char[], not char* - we take sizeof() of it #define outbuf bb_common_bufsiz1 -static char *cur_outbuf = outbuf; +#define INIT_G() do { \ + cur_outbuf = outbuf; \ + final_str = "\n"; \ + deltanz = delta = 1000000; \ + } while (0) static inline void reset_outbuf(void) { @@ -85,27 +119,31 @@ static void put_question_marks(int count) put_c('?'); } -static int readfile_z(char *buf, int sz, const char* fname) +static void readfile_z(char *buf, int sz, const char* fname) { - sz = open_read_close(fname, buf, sz-1); - if (sz < 0) { - buf[0] = '\0'; - return 1; +// open_read_close() will do two reads in order to be sure we are at EOF, +// and we don't need/want that. +// sz = open_read_close(fname, buf, sz-1); + + int fd = xopen(fname, O_RDONLY); + buf[0] = '\0'; + if (fd >= 0) { + sz = read(fd, buf, sz-1); + if (sz > 0) buf[sz] = '\0'; + close(fd); } - buf[sz] = '\0'; - return 0; } static const char* get_file(proc_file *pf) { - if (pf->gen != gen) { - pf->gen = gen; - // We allocate proc_file_size bytes. This wastes memory, + if (pf->last_gen != gen) { + pf->last_gen = gen; + // We allocate PROC_FILE_SIZE bytes. This wastes memory, // but allows us to allocate only once (at first sample) // per proc file, and reuse buffer for each sample if (!pf->file) - pf->file = xmalloc(proc_file_size); - readfile_z(pf->file, proc_file_size, pf->name); + pf->file = xmalloc(PROC_FILE_SIZE); + readfile_z(pf->file, PROC_FILE_SIZE, proc_name[pf - &first_proc_file]); } return pf->file; } @@ -242,10 +280,10 @@ static s_stat* init_literal(void) static s_stat* init_delay(const char *param) { - delta = strtol(param, NULL, 0)*1000; + delta = bb_strtoi(param, NULL, 0) * 1000; deltanz = delta > 0 ? delta : 1; need_seconds = (1000000%deltanz) != 0; - return (s_stat*)0; + return NULL; } static s_stat* init_cr(const char *param) @@ -281,7 +319,7 @@ static void collect_cpu(cpu_stat *s) return; } - for (i=0; i<CPU_FIELDCNT; i++) { + for (i = 0; i < CPU_FIELDCNT; i++) { ullong old = s->old[i]; if (data[i] < old) old = data[i]; //sanitize s->old[i] = data[i]; @@ -289,7 +327,7 @@ static void collect_cpu(cpu_stat *s) } if (all) { - for (i=0; i<CPU_FIELDCNT; i++) { + for (i = 0; i < CPU_FIELDCNT; i++) { ullong t = bar_sz * data[i]; norm_all += data[i] = t / all; frac[i] = t % all; @@ -298,7 +336,7 @@ static void collect_cpu(cpu_stat *s) while (norm_all < bar_sz) { unsigned max = frac[0]; int pos = 0; - for (i=1; i<CPU_FIELDCNT; i++) { + for (i = 1; i < CPU_FIELDCNT; i++) { if (frac[i] > max) max = frac[i], pos = i; } frac[pos] = 0; //avoid bumping up same value twice @@ -640,11 +678,9 @@ S_STAT_END(fd_stat) static void collect_fd(fd_stat *s) { - char file[4096]; ullong data[2]; - readfile_z(file, sizeof(file), "/proc/sys/fs/file-nr"); - if (rdval(file, "", data, 1, 2)) { + if (rdval(get_file(&proc_sys_fs_filenr), "", data, 1, 2)) { put_question_marks(4); return; } @@ -702,7 +738,7 @@ static s_stat* init_time(const char *param) static void collect_info(s_stat *s) { - gen++; + gen ^= 1; while (s) { put(s->label); s->collect(s); @@ -714,7 +750,7 @@ static void collect_info(s_stat *s) typedef s_stat* init_func(const char *param); static const char options[] = "ncmsfixptbdr"; -static init_func* init_functions[] = { +static init_func *const init_functions[] = { init_if, init_cpu, init_mem, @@ -738,10 +774,15 @@ int nmeter_main(int argc, char **argv) s_stat *s; char *cur, *prev; + PTR_TO_GLOBALS = xzalloc(sizeof(G)); + INIT_G(); + + xchdir("/proc"); + if (argc != 2) bb_show_usage(); - if (open_read_close("/proc/version", buf, sizeof(buf)) > 0) + if (open_read_close("version", buf, sizeof(buf)) > 0) is26 = (strstr(buf, " 2.4.")==NULL); // Can use argv[1] directly, but this will mess up @@ -750,11 +791,11 @@ int nmeter_main(int argc, char **argv) while (1) { char *param, *p; prev = cur; -again: + again: cur = strchr(cur, '%'); if (!cur) break; - if (cur[1]=='%') { // %% + if (cur[1] == '%') { // %% strcpy(cur, cur+1); cur++; goto again; @@ -813,12 +854,12 @@ again: collect_info(first); reset_outbuf(); if (delta >= 0) { - gettimeofday(&tv, 0); + gettimeofday(&tv, NULL); usleep(delta > 1000000 ? 1000000 : delta - tv.tv_usec%deltanz); } while (1) { - gettimeofday(&tv, 0); + gettimeofday(&tv, NULL); collect_info(first); put(final_str); print_outbuf(); @@ -831,9 +872,9 @@ again: if (delta >= 0) { int rem; // can be commented out, will sacrifice sleep time precision a bit - gettimeofday(&tv, 0); + gettimeofday(&tv, NULL); if (need_seconds) - rem = delta - ((ullong)tv.tv_sec*1000000+tv.tv_usec)%deltanz; + rem = delta - ((ullong)tv.tv_sec*1000000 + tv.tv_usec) % deltanz; else rem = delta - tv.tv_usec%deltanz; // Sometimes kernel wakes us up just a tiny bit earlier than asked @@ -845,5 +886,5 @@ again: } } - return 0; + /*return 0;*/ } |