top: don't wait before final bailout (try top -b -n1).
top: make code a bit more readable.
This commit is contained in:
Denis Vlasenko
parent
fb48f6c982
commit
8bdba4d011
59
procps/top.c
59
procps/top.c
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@ -67,7 +67,7 @@ struct globals {
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struct termios initial_settings;
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#endif
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#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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cmp_funcp sort_function;
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cmp_funcp sort_function[1];
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#else
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cmp_funcp sort_function[SORT_DEPTH];
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struct save_hist *prev_hist;
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@ -81,17 +81,14 @@ struct globals {
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define top (G.top )
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#define ntop (G.ntop )
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#if ENABLE_FEATURE_USE_TERMIOS
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#define initial_settings (G. initial_settings )
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#endif
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#define sort_function (G.sort_function )
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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#define prev_hist (G.prev_hist )
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#define prev_hist_count (G.prev_hist_count )
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#define jif (G.jif )
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#define prev_jif (G.prev_jif )
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#define total_pcpu (G.total_pcpu )
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#endif
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#define OPT_BATCH_MODE (option_mask32 & 0x4)
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@ -356,8 +353,7 @@ static unsigned long display_generic(int scr_width)
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return total;
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}
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/* display process statuses */
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static void display_status(int count, int scr_width)
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static void display_process_list(int count, int scr_width)
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{
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enum {
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BITS_PER_INT = sizeof(int)*8
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@ -482,7 +478,6 @@ static void display_status(int count, int scr_width)
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#undef CALC_STAT
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#undef FMT
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static void clearmems(void)
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{
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clear_username_cache();
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@ -491,7 +486,6 @@ static void clearmems(void)
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ntop = 0;
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}
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#if ENABLE_FEATURE_USE_TERMIOS
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#include <termios.h>
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#include <signal.h>
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@ -499,12 +493,12 @@ static void clearmems(void)
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static void reset_term(void)
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{
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tcsetattr(0, TCSANOW, (void *) &initial_settings);
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#if ENABLE_FEATURE_CLEAN_UP
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clearmems();
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if (ENABLE_FEATURE_CLEAN_UP) {
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clearmems();
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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free(prev_hist);
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free(prev_hist);
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#endif
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#endif /* FEATURE_CLEAN_UP */
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}
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}
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static void sig_catcher(int sig ATTRIBUTE_UNUSED)
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@ -548,7 +542,7 @@ int top_main(int argc, char **argv)
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xchdir("/proc");
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#if ENABLE_FEATURE_USE_TERMIOS
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tcgetattr(0, (void *) &initial_settings);
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memcpy(&new_settings, &initial_settings, sizeof(struct termios));
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memcpy(&new_settings, &initial_settings, sizeof(new_settings));
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/* unbuffered input, turn off echo */
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new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
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@ -563,17 +557,18 @@ int top_main(int argc, char **argv)
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sort_function[1] = mem_sort;
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sort_function[2] = time_sort;
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#else
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sort_function = mem_sort;
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sort_function[0] = mem_sort;
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#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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while (1) {
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procps_status_t *p = NULL;
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/* Default to 25 lines - 5 lines for status */
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/* Default */
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lines = 24 - 3 USE_FEATURE_TOP_CPU_GLOBAL_PERCENTS( - 1);
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col = 79;
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#if ENABLE_FEATURE_USE_TERMIOS
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get_terminal_width_height(0, &col, &lines);
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/* We wrap horribly if width is too narrow (TODO) */
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if (lines < 5 || col < MIN_WIDTH) {
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sleep(interval);
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continue;
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@ -618,27 +613,31 @@ int top_main(int argc, char **argv)
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/* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
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qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
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#else
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qsort(top, ntop, sizeof(top_status_t), (void*)sort_function);
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qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
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#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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count = lines;
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if (OPT_BATCH_MODE || count > ntop) {
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count = ntop;
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}
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/* show status for each of the processes */
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display_status(count, col);
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#if ENABLE_FEATURE_USE_TERMIOS
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display_process_list(count, col);
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clearmems();
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if (iterations >= 0 && !--iterations)
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break;
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#if !ENABLE_FEATURE_USE_TERMIOS
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sleep(interval);
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#else
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if (poll(pfd, 1, interval * 1000) != 0) {
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if (read(0, &c, 1) != 1) /* signal */
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break;
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if (c == 'q' || c == initial_settings.c_cc[VINTR])
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break;
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if (c == 'N')
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sort_function[0] = pid_sort;
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if (c == 'M') {
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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sort_function[0] = mem_sort;
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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sort_function[1] = pcpu_sort;
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sort_function[2] = time_sort;
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#else
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sort_function = mem_sort;
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#endif
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}
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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@ -653,23 +652,9 @@ int top_main(int argc, char **argv)
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sort_function[2] = pcpu_sort;
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}
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#endif
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if (c == 'N') {
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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sort_function[0] = pid_sort;
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#else
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sort_function = pid_sort;
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#endif
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}
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}
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if (iterations >= 0 && !--iterations)
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break;
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#else
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sleep(interval);
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#endif /* FEATURE_USE_TERMIOS */
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clearmems();
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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clearmems();
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putchar('\n');
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return EXIT_SUCCESS;
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}
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