ps: fix sscanf format specifier (%l); make uptime unsigned

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/procps/ps.c b/procps/ps.c
index efc087e..5f73722 100644 (file)
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -70,7 +70,7 @@
 enum { MAX_WIDTH = 2*1024 };
 
 #if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
-static long get_uptime(void)
+static unsigned long get_uptime(void)
 {
 #ifdef __linux__
        struct sysinfo info;
@@ -78,12 +78,15 @@ static long get_uptime(void)
                return 0;
        return info.uptime;
 #elif 1
-       char buf[64];
-       long uptime;
+       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");
+               bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
        buf[sizeof(buf)-1] = '\0';
-       sscanf(buf, "%l", &uptime);
+       sscanf(buf, "%lu", &uptime);
        return uptime;
 #else
        struct timespec ts;
@@ -138,7 +141,10 @@ struct globals {
        unsigned terminal_width;
 #if ENABLE_FEATURE_PS_TIME
        unsigned kernel_HZ;
-       unsigned long long seconds_since_boot;
+       /* used to be long long, but 64 bits is enough
+        * (long long may become 128 bits in the future):
+        */
+       uint64_t seconds_since_boot;
 #endif
 } FIX_ALIASING;
 #define G (*(struct globals*)&bb_common_bufsiz1)
@@ -149,14 +155,13 @@ struct globals {
 #define buffer             (G.buffer            )
 #define terminal_width     (G.terminal_width    )
 #define kernel_HZ          (G.kernel_HZ         )
-#define seconds_since_boot (G.seconds_since_boot)
 #define INIT_G() do { } while (0)
 
 #if ENABLE_FEATURE_PS_TIME
 /* for ELF executables, notes are pushed before environment and args */
-static ptrdiff_t find_elf_note(ptrdiff_t findme)
+static uintptr_t find_elf_note(uintptr_t findme)
 {
-       ptrdiff_t *ep = (ptrdiff_t *) environ;
+       uintptr_t *ep = (uintptr_t *) environ;
 
        while (*ep++)
                continue;
@@ -222,7 +227,6 @@ static inline unsigned get_HZ_by_waiting(void)
 
 static unsigned get_kernel_HZ(void)
 {
-
        if (kernel_HZ)
                return kernel_HZ;
 
@@ -231,7 +235,7 @@ static unsigned get_kernel_HZ(void)
        if (kernel_HZ == (unsigned)-1)
                kernel_HZ = get_HZ_by_waiting();
 
-       seconds_since_boot = get_uptime();
+       G.seconds_since_boot = get_uptime();
 
        return kernel_HZ;
 }
@@ -350,7 +354,7 @@ static void func_etime(char *buf, int size, const procps_status_t *ps)
 
        mm = ps->start_time / get_kernel_HZ();
        /* must be after get_kernel_HZ()! */
-       mm = seconds_since_boot - mm;
+       mm = G.seconds_since_boot - mm;
        ss = mm % 60;
        mm /= 60;
        snprintf(buf, size+1, "%3lu:%02u", mm, ss);
@@ -588,7 +592,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv)
        // -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 it standardized).
+        * -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.
         */
@@ -599,7 +603,9 @@ int ps_main(int argc UNUSED_PARAM, char **argv)
                        parse_o(llist_pop(&opt_o));
                } while (opt_o);
        } else {
-               /* Below: parse_o() needs char*, NOT const char*, can't give it default_o */
+               /* 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 */
@@ -653,7 +659,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
        };
 #if ENABLE_FEATURE_PS_LONG
        time_t now = now;
-       long uptime;
+       unsigned long uptime;
 #endif
        /* If we support any options, parse argv */
 #if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG