Source of top.c - busybox

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    top = NULL;
    ntop = 0;
}
​
#if ENABLE_FEATURE_USE_TERMIOS
#include <termios.h>
#include <signal.h>
​
static void reset_term(void)
{
    tcsetattr(0, TCSANOW, &initial_settings);
    tcsetattr_stdin_TCSANOW(&initial_settings);
    if (ENABLE_FEATURE_CLEAN_UP) {
        clearmems();
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
        free(prev_hist);
#endif
    }
}
​
static void sig_catcher(int sig UNUSED_PARAM)
{
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​
    /* change to /proc */
    xchdir("/proc");
#if ENABLE_FEATURE_USE_TERMIOS
    tcgetattr(0, (void *) &initial_settings);
    memcpy(&new_settings, &initial_settings, sizeof(new_settings));
    /* unbuffered input, turn off echo */
    new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
​
    bb_signals(BB_FATAL_SIGS, sig_catcher);
    tcsetattr(0, TCSANOW, (void *) &new_settings);
    tcsetattr_stdin_TCSANOW(&new_settings);
#endif /* FEATURE_USE_TERMIOS */
​
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
    sort_function[0] = pcpu_sort;
    sort_function[1] = mem_sort;
    sort_function[2] = time_sort;
#else
    sort_function[0] = mem_sort;
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
​