/* vi: set sw=4 ts=4: */
/*
 * Mini ps implementation(s) for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
 *                         (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
//config:config PS
//config:       bool "ps"
//config:       default y
//config:       help
//config:         ps gives a snapshot of the current processes.
//config:
//config:config FEATURE_PS_WIDE
//config:       bool "Enable wide output option (-w)"
//config:       default y
//config:       depends on PS && !DESKTOP
//config:       help
//config:         Support argument 'w' for wide output.
//config:         If given once, 132 chars are printed, and if given more
//config:         than once, the length is unlimited.
//config:
//config:config FEATURE_PS_LONG
//config:       bool "Enable long output option (-l)"
//config:       default y
//config:       depends on PS && !DESKTOP
//config:       help
//config:         Support argument 'l' for long output.
//config:         Adds fields PPID, RSS, START, TIME & TTY
//config:
//config:config FEATURE_PS_TIME
//config:       bool "Support -o time and -o etime output specifiers"
//config:       default y
//config:       depends on PS && DESKTOP
//config:       select PLATFORM_LINUX
//config:
//config:config FEATURE_PS_UNUSUAL_SYSTEMS
//config:       bool "Support Linux prior to 2.4.0 and non-ELF systems"
//config:       default n
//config:       depends on FEATURE_PS_TIME
//config:       help
//config:         Include support for measuring HZ on old kernels and non-ELF systems
//config:         (if you are on Linux 2.4.0+ and use ELF, you don't need this)
//config:
//config:config FEATURE_PS_ADDITIONAL_COLUMNS
//config:       bool "Support -o rgroup, -o ruser, -o nice specifiers"
//config:       default y
//config:       depends on PS && DESKTOP

//applet:IF_PS(APPLET(ps, BB_DIR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_PS) += ps.o

//usage:#if ENABLE_DESKTOP
//usage:
//usage:#define ps_trivial_usage
//usage:       "[-o COL1,COL2=HEADER]" IF_FEATURE_SHOW_THREADS(" [-T]")
//usage:#define ps_full_usage "\n\n"
//usage:       "Show list of processes\n"
//usage:     "\n        -o COL1,COL2=HEADER     Select columns for display"
//usage:        IF_FEATURE_SHOW_THREADS(
//usage:     "\n        -T                      Show threads"
//usage:        )
//usage:
//usage:#else /* !ENABLE_DESKTOP */
//usage:
//usage:#if !ENABLE_SELINUX && !ENABLE_FEATURE_PS_WIDE
//usage:#define USAGE_PS "\nThis version of ps accepts no options"
//usage:#else
//usage:#define USAGE_PS ""
//usage:#endif
//usage:
//usage:#define ps_trivial_usage
//usage:       ""
//usage:#define ps_full_usage "\n\n"
//usage:       "Show list of processes\n"
//usage:        USAGE_PS
//usage:        IF_SELINUX(
//usage:     "\n        -Z      Show selinux context"
//usage:        )
//usage:        IF_FEATURE_PS_WIDE(
//usage:     "\n        w       Wide output"
//usage:        )
//usage:        IF_FEATURE_PS_LONG(
//usage:     "\n        l       Long output"
//usage:        )
//usage:        IF_FEATURE_SHOW_THREADS(
//usage:     "\n        T       Show threads"
//usage:        )
//usage:
//usage:#endif /* ENABLE_DESKTOP */
//usage:
//usage:#define ps_example_usage
//usage:       "$ ps\n"
//usage:       "  PID  Uid      Gid State Command\n"
//usage:       "    1 root     root     S init\n"
//usage:       "    2 root     root     S [kflushd]\n"
//usage:       "    3 root     root     S [kupdate]\n"
//usage:       "    4 root     root     S [kpiod]\n"
//usage:       "    5 root     root     S [kswapd]\n"
//usage:       "  742 andersen andersen S [bash]\n"
//usage:       "  743 andersen andersen S -bash\n"
//usage:       "  745 root     root     S [getty]\n"
//usage:       " 2990 andersen andersen R ps\n"

#include "libbb.h"
#include "common_bufsiz.h"
#ifdef __linux__
# include <sys/sysinfo.h>
#endif

/* Absolute maximum on output line length */
enum { MAX_WIDTH = 2*1024 };

#if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
static unsigned long get_uptime(void)
{
#ifdef __linux__
        struct sysinfo info;
        if (sysinfo(&info) < 0)
                return 0;
        return info.uptime;
#elif 1
        unsigned long uptime;
        char buf[sizeof(uptime)*3 + 2];
        /* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
         * (where IDLE is cumulative over all CPUs)
         */
        if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
                bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
        buf[sizeof(buf)-1] = '\0';
        sscanf(buf, "%lu", &uptime);
        return uptime;
#else
        struct timespec ts;
        if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
                return 0;
        return ts.tv_sec;
#endif
}
#endif

#if ENABLE_DESKTOP

#include <sys/times.h> /* for times() */
#ifndef AT_CLKTCK
# define AT_CLKTCK 17
#endif

/* TODO:
 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
 * specifies (for XSI-conformant systems) following default columns
 * (l and f mark columns shown with -l and -f respectively):
 * F     l   Flags (octal and additive) associated with the process (??)
 * S     l   The state of the process
 * UID   f,l The user ID; the login name is printed with -f
 * PID       The process ID
 * PPID  f,l The parent process
 * C     f,l Processor utilization
 * PRI   l   The priority of the process; higher numbers mean lower priority
 * NI    l   Nice value
 * ADDR  l   The address of the process
 * SZ    l   The size in blocks of the core image of the process
 * WCHAN l   The event for which the process is waiting or sleeping
 * STIME f   Starting time of the process
 * TTY       The controlling terminal for the process
 * TIME      The cumulative execution time for the process
 * CMD       The command name; the full command line is shown with -f
 */
typedef struct {
        uint16_t width;
        char name6[6];
        const char *header;
        void (*f)(char *buf, int size, const procps_status_t *ps);
        int ps_flags;
} ps_out_t;

struct globals {
        ps_out_t* out;
        int out_cnt;
        int print_header;
        int need_flags;
        char *buffer;
        unsigned terminal_width;
#if ENABLE_FEATURE_PS_TIME
        unsigned kernel_HZ;
        unsigned long seconds_since_boot;
#endif
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define out                (G.out               )
#define out_cnt            (G.out_cnt           )
#define print_header       (G.print_header      )
#define need_flags         (G.need_flags        )
#define buffer             (G.buffer            )
#define terminal_width     (G.terminal_width    )
#define kernel_HZ          (G.kernel_HZ         )
#define INIT_G() do { setup_common_bufsiz(); } while (0)

#if ENABLE_FEATURE_PS_TIME
/* for ELF executables, notes are pushed before environment and args */
static uintptr_t find_elf_note(uintptr_t findme)
{
        uintptr_t *ep = (uintptr_t *) environ;

        while (*ep++)
                continue;
        while (*ep) {
                if (ep[0] == findme) {
                        return ep[1];
                }
                ep += 2;
        }
        return -1;
}

#if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
static unsigned get_HZ_by_waiting(void)
{
        struct timeval tv1, tv2;
        unsigned t1, t2, r, hz;
        unsigned cnt = cnt; /* for compiler */
        int diff;

        r = 0;

        /* Wait for times() to reach new tick */
        t1 = times(NULL);
        do {
                t2 = times(NULL);
        } while (t2 == t1);
        gettimeofday(&tv2, NULL);

        do {
                t1 = t2;
                tv1.tv_usec = tv2.tv_usec;

                /* Wait exactly one times() tick */
                do {
                        t2 = times(NULL);
                } while (t2 == t1);
                gettimeofday(&tv2, NULL);

                /* Calculate ticks per sec, rounding up to even */
                diff = tv2.tv_usec - tv1.tv_usec;
                if (diff <= 0) diff += 1000000;
                hz = 1000000u / (unsigned)diff;
                hz = (hz+1) & ~1;

                /* Count how many same hz values we saw */
                if (r != hz) {
                        r = hz;
                        cnt = 0;
                }
                cnt++;
        } while (cnt < 3); /* exit if saw 3 same values */

        return r;
}
#else
static inline unsigned get_HZ_by_waiting(void)
{
        /* Better method? */
        return 100;
}
#endif

static unsigned get_kernel_HZ(void)
{
        if (kernel_HZ)
                return kernel_HZ;

        /* Works for ELF only, Linux 2.4.0+ */
        kernel_HZ = find_elf_note(AT_CLKTCK);
        if (kernel_HZ == (unsigned)-1)
                kernel_HZ = get_HZ_by_waiting();

        G.seconds_since_boot = get_uptime();

        return kernel_HZ;
}
#endif

/* Print value to buf, max size+1 chars (including trailing '\0') */

static void func_user(char *buf, int size, const procps_status_t *ps)
{
#if 1
        safe_strncpy(buf, get_cached_username(ps->uid), size+1);
#else
        /* "compatible" version, but it's larger */
        /* procps 2.18 shows numeric UID if name overflows the field */
        /* TODO: get_cached_username() returns numeric string if
         * user has no passwd record, we will display it
         * left-justified here; too long usernames are shown
         * as _right-justified_ IDs. Is it worth fixing? */
        const char *user = get_cached_username(ps->uid);
        if (strlen(user) <= size)
                safe_strncpy(buf, user, size+1);
        else
                sprintf(buf, "%*u", size, (unsigned)ps->uid);
#endif
}

static void func_group(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
}

static void func_comm(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, ps->comm, size+1);
}

static void func_state(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, ps->state, size+1);
}

static void func_args(char *buf, int size, const procps_status_t *ps)
{
        read_cmdline(buf, size+1, ps->pid, ps->comm);
}

static void func_pid(char *buf, int size, const procps_status_t *ps)
{
        sprintf(buf, "%*u", size, ps->pid);
}

static void func_ppid(char *buf, int size, const procps_status_t *ps)
{
        sprintf(buf, "%*u", size, ps->ppid);
}

static void func_pgid(char *buf, int size, const procps_status_t *ps)
{
        sprintf(buf, "%*u", size, ps->pgid);
}

static void put_lu(char *buf, int size, unsigned long u)
{
        char buf4[5];

        /* see http://en.wikipedia.org/wiki/Tera */
        smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
        sprintf(buf, "%.*s", size, buf4);
}

static void func_vsz(char *buf, int size, const procps_status_t *ps)
{
        put_lu(buf, size, ps->vsz);
}

static void func_rss(char *buf, int size, const procps_status_t *ps)
{
        put_lu(buf, size, ps->rss);
}

static void func_tty(char *buf, int size, const procps_status_t *ps)
{
        buf[0] = '?';
        buf[1] = '\0';
        if (ps->tty_major) /* tty field of "0" means "no tty" */
                snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
}

#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS

static void func_rgroup(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
}

static void func_ruser(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
}

static void func_nice(char *buf, int size, const procps_status_t *ps)
{
        sprintf(buf, "%*d", size, ps->niceness);
}

#endif

#if ENABLE_FEATURE_PS_TIME

static void func_etime(char *buf, int size, const procps_status_t *ps)
{
        /* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
        unsigned long mm;
        unsigned ss;

        mm = ps->start_time / get_kernel_HZ();
        /* must be after get_kernel_HZ()! */
        mm = G.seconds_since_boot - mm;
        ss = mm % 60;
        mm /= 60;
        snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}

static void func_time(char *buf, int size, const procps_status_t *ps)
{
        /* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
        unsigned long mm;
        unsigned ss;

        mm = (ps->utime + ps->stime) / get_kernel_HZ();
        ss = mm % 60;
        mm /= 60;
        snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}

#endif

#if ENABLE_SELINUX
static void func_label(char *buf, int size, const procps_status_t *ps)
{
        safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
}
#endif

/*
static void func_nice(char *buf, int size, const procps_status_t *ps)
{
        ps->???
}

static void func_pcpu(char *buf, int size, const procps_status_t *ps)
{
}
*/

static const ps_out_t out_spec[] = {
/* Mandated by http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html: */
        { 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
        { 8                  , "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
        { 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
        { MAX_WIDTH          , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
        { 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
        { 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
        { 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
#if ENABLE_FEATURE_PS_TIME
        { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
#endif
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
        { 5                  , "nice"  ,"NI"     ,func_nice  ,PSSCAN_NICE    },
        { 8                  , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
        { 8                  , "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_RUIDGID },
//      { 5                  , "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
#endif
#if ENABLE_FEATURE_PS_TIME
        { 6                  , "time"  ,"TIME"   ,func_time  ,PSSCAN_STIME | PSSCAN_UTIME },
#endif
        { 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
        { 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
/* Not mandated, but useful: */
        { 4                  , "stat"  ,"STAT"   ,func_state ,PSSCAN_STATE   },
        { 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
#if ENABLE_SELINUX
        { 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
#endif
};

static ps_out_t* new_out_t(void)
{
        out = xrealloc_vector(out, 2, out_cnt);
        return &out[out_cnt++];
}

static const ps_out_t* find_out_spec(const char *name)
{
        unsigned i;
        char buf[ARRAY_SIZE(out_spec)*7 + 1];
        char *p = buf;

        for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
                if (strncmp(name, out_spec[i].name6, 6) == 0)
                        return &out_spec[i];
                p += sprintf(p, "%.6s,", out_spec[i].name6);
        }
        p[-1] = '\0';
        bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
}

static void parse_o(char* opt)
{
        ps_out_t* new;
        // POSIX: "-o is blank- or comma-separated list" (FIXME)
        char *comma, *equal;
        while (1) {
                comma = strchr(opt, ',');
                equal = strchr(opt, '=');
                if (comma && (!equal || equal > comma)) {
                        *comma = '\0';
                        *new_out_t() = *find_out_spec(opt);
                        *comma = ',';
                        opt = comma + 1;
                        continue;
                }
                break;
        }
        // opt points to last spec in comma separated list.
        // This one can have =HEADER part.
        new = new_out_t();
        if (equal)
                *equal = '\0';
        *new = *find_out_spec(opt);
        if (equal) {
                *equal = '=';
                new->header = equal + 1;
                // POSIX: the field widths shall be ... at least as wide as
                // the header text (default or overridden value).
                // If the header text is null, such as -o user=,
                // the field width shall be at least as wide as the
                // default header text
                if (new->header[0]) {
                        new->width = strlen(new->header);
                        print_header = 1;
                }
        } else
                print_header = 1;
}

static void alloc_line_buffer(void)
{
        int i;
        int width = 0;
        for (i = 0; i < out_cnt; i++) {
                need_flags |= out[i].ps_flags;
                if (out[i].header[0]) {
                        print_header = 1;
                }
                width += out[i].width + 1; /* "FIELD " */
                if ((int)(width - terminal_width) > 0) {
                        /* The rest does not fit on the screen */
                        //out[i].width -= (width - terminal_width - 1);
                        out_cnt = i + 1;
                        break;
                }
        }
#if ENABLE_SELINUX
        if (!is_selinux_enabled())
                need_flags &= ~PSSCAN_CONTEXT;
#endif
        buffer = xmalloc(width + 1); /* for trailing \0 */
}

static void format_header(void)
{
        int i;
        ps_out_t* op;
        char *p;

        if (!print_header)
                return;
        p = buffer;
        i = 0;
        if (out_cnt) {
                while (1) {
                        op = &out[i];
                        if (++i == out_cnt) /* do not pad last field */
                                break;
                        p += sprintf(p, "%-*s ", op->width, op->header);
                }
                strcpy(p, op->header);
        }
        printf("%.*s\n", terminal_width, buffer);
}

static void format_process(const procps_status_t *ps)
{
        int i, len;
        char *p = buffer;
        i = 0;
        if (out_cnt) while (1) {
                out[i].f(p, out[i].width, ps);
                // POSIX: Any field need not be meaningful in all
                // implementations. In such a case a hyphen ( '-' )
                // should be output in place of the field value.
                if (!p[0]) {
                        p[0] = '-';
                        p[1] = '\0';
                }
                len = strlen(p);
                p += len;
                len = out[i].width - len + 1;
                if (++i == out_cnt) /* do not pad last field */
                        break;
                p += sprintf(p, "%*s", len, "");
        }
        printf("%.*s\n", terminal_width, buffer);
}

#if ENABLE_SELINUX
# define SELINUX_O_PREFIX "label,"
# define DEFAULT_O_STR    (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#else
# define DEFAULT_O_STR    ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#endif

int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv)
{
        procps_status_t *p;
        llist_t* opt_o = NULL;
        char default_o[sizeof(DEFAULT_O_STR)];
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
        int opt;
#endif
        enum {
                OPT_Z = (1 << 0),
                OPT_o = (1 << 1),
                OPT_a = (1 << 2),
                OPT_A = (1 << 3),
                OPT_d = (1 << 4),
                OPT_e = (1 << 5),
                OPT_f = (1 << 6),
                OPT_l = (1 << 7),
                OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
        };

        INIT_G();

        // POSIX:
        // -a  Write information for all processes associated with terminals
        //     Implementations may omit session leaders from this list
        // -A  Write information for all processes
        // -d  Write information for all processes, except session leaders
        // -e  Write information for all processes (equivalent to -A)
        // -f  Generate a full listing
        // -l  Generate a long listing
        // -o col1,col2,col3=header
        //     Select which columns to display
        /* We allow (and ignore) most of the above. FIXME.
         * -T is picked for threads (POSIX hasn't standardized it).
         * procps v3.2.7 supports -T and shows tids as SPID column,
         * it also supports -L where it shows tids as LWP column.
         */
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
        opt =
#endif
                getopt32(argv, "Zo:*aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);

        if (opt_o) {
                do {
                        parse_o(llist_pop(&opt_o));
                } while (opt_o);
        } else {
                /* Below: parse_o() needs char*, NOT const char*,
                 * can't pass it constant string. Need to make a copy first.
                 */
#if ENABLE_SELINUX
                if (!(opt & OPT_Z) || !is_selinux_enabled()) {
                        /* no -Z or no SELinux: do not show LABEL */
                        strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
                } else
#endif
                {
                        strcpy(default_o, DEFAULT_O_STR);
                }
                parse_o(default_o);
        }
#if ENABLE_FEATURE_SHOW_THREADS
        if (opt & OPT_T)
                need_flags |= PSSCAN_TASKS;
#endif

        /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
         * and such large widths */
        terminal_width = MAX_WIDTH;
        if (isatty(1)) {
                terminal_width = get_terminal_width(0);
                if (--terminal_width > MAX_WIDTH)
                        terminal_width = MAX_WIDTH;
        }
        alloc_line_buffer();
        format_header();

        p = NULL;
        while ((p = procps_scan(p, need_flags)) != NULL) {
                format_process(p);
        }

        return EXIT_SUCCESS;
}


#else /* !ENABLE_DESKTOP */


int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
        procps_status_t *p;
        int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
                        | PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
        unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
        enum {
                OPT_Z = (1 << 0) * ENABLE_SELINUX,
                OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
                OPT_l = (1 << ENABLE_SELINUX) * (1 << ENABLE_FEATURE_SHOW_THREADS) * ENABLE_FEATURE_PS_LONG,
        };
#if ENABLE_FEATURE_PS_LONG
        time_t now = now; /* for compiler */
        unsigned long uptime = uptime;
#endif
        /* If we support any options, parse argv */
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG
        int opts = 0;
# if ENABLE_FEATURE_PS_WIDE
        /* -w is a bit complicated */
        int w_count = 0;
        opt_complementary = "-:ww";
        opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l")
                                        "w", &w_count);
        /* if w is given once, GNU ps sets the width to 132,
         * if w is given more than once, it is "unlimited"
         */
        if (w_count) {
                terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
        } else {
                terminal_width = get_terminal_width(0);
                /* Go one less... */
                if (--terminal_width > MAX_WIDTH)
                        terminal_width = MAX_WIDTH;
        }
# else
        /* -w is not supported, only -Z and/or -T */
        opt_complementary = "-";
        opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l"));
# endif

# if ENABLE_SELINUX
        if ((opts & OPT_Z) && is_selinux_enabled()) {
                psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
                                | PSSCAN_STATE | PSSCAN_COMM;
                puts("  PID CONTEXT                          STAT COMMAND");
        } else
# endif
        if (opts & OPT_l) {
                psscan_flags = PSSCAN_STATE | PSSCAN_UIDGID | PSSCAN_PID | PSSCAN_PPID
                        | PSSCAN_TTY | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_COMM
                        | PSSCAN_VSZ | PSSCAN_RSS;
/* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
 * mandates for -l:
 * -F     Flags (?)
 * S      State
 * UID,PID,PPID
 * -C     CPU usage
 * -PRI   The priority of the process; higher numbers mean lower priority
 * -NI    Nice value
 * -ADDR  The address of the process (?)
 * SZ     The size in blocks of the core image
 * -WCHAN The event for which the process is waiting or sleeping
 * TTY
 * TIME   The cumulative execution time
 * CMD
 * We don't show fields marked with '-'.
 * We show VSZ and RSS instead of SZ.
 * We also show STIME (standard says that -f shows it, -l doesn't).
 */
                puts("S   UID   PID  PPID   VSZ   RSS TTY   STIME TIME     CMD");
# if ENABLE_FEATURE_PS_LONG
                now = time(NULL);
                uptime = get_uptime();
# endif
        }
        else {
                puts("  PID USER       VSZ STAT COMMAND");
        }
        if (opts & OPT_T) {
                psscan_flags |= PSSCAN_TASKS;
        }
#endif

        p = NULL;
        while ((p = procps_scan(p, psscan_flags)) != NULL) {
                int len;
#if ENABLE_SELINUX
                if (psscan_flags & PSSCAN_CONTEXT) {
                        len = printf("%5u %-32.32s %s  ",
                                        p->pid,
                                        p->context ? p->context : "unknown",
                                        p->state);
                } else
#endif
                {
                        char buf6[6];
                        smart_ulltoa5(p->vsz, buf6, " mgtpezy")[0] = '\0';
#if ENABLE_FEATURE_PS_LONG
                        if (opts & OPT_l) {
                                char bufr[6], stime_str[6];
                                char tty[2 * sizeof(int)*3 + 2];
                                char *endp;
                                unsigned sut = (p->stime + p->utime) / 100;
                                unsigned elapsed = uptime - (p->start_time / 100);
                                time_t start = now - elapsed;
                                struct tm *tm = localtime(&start);

                                smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';

                                if (p->tty_major == 136)
                                        /* It should be pts/N, not ptsN, but N > 9
                                         * will overflow field width...
                                         */
                                        endp = stpcpy(tty, "pts");
                                else
                                if (p->tty_major == 4) {
                                        endp = stpcpy(tty, "tty");
                                        if (p->tty_minor >= 64) {
                                                p->tty_minor -= 64;
                                                *endp++ = 'S';
                                        }
                                }
                                else
                                        endp = tty + sprintf(tty, "%d:", p->tty_major);
                                strcpy(endp, utoa(p->tty_minor));

                                strftime(stime_str, 6, (elapsed >= (24 * 60 * 60)) ? "%b%d" : "%H:%M", tm);
                                stime_str[5] = '\0';
                                //            S  UID PID PPID VSZ RSS TTY STIME TIME        CMD
                                len = printf("%c %5u %5u %5u %5s %5s %-5s %s %02u:%02u:%02u ",
                                        p->state[0], p->uid, p->pid, p->ppid, buf6, bufr, tty,
                                        stime_str, sut / 3600, (sut % 3600) / 60, sut % 60);
                        } else
#endif
                        {
                                const char *user = get_cached_username(p->uid);
                                len = printf("%5u %-8.8s %s %s  ",
                                        p->pid, user, buf6, p->state);
                        }
                }

                {
                        int sz = terminal_width - len;
                        if (sz >= 0) {
                                char buf[sz + 1];
                                read_cmdline(buf, sz, p->pid, p->comm);
                                puts(buf);
                        }
                }
        }
        if (ENABLE_FEATURE_CLEAN_UP)
                clear_username_cache();
        return EXIT_SUCCESS;
}

#endif /* !ENABLE_DESKTOP */