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ps: add conditional support for -o [e]time

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This commit is contained in:
Denis Vlasenko
2008-01-05 03:26:41 +00:00
parent 9cd30d30a0
commit 5fee2e1a79
5 changed files with 195 additions and 49 deletions
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216
procps/ps.c
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@ -16,6 +16,143 @@ enum { MAX_WIDTH = 2*1024 };
#if ENABLE_DESKTOP
#include <sys/times.h> /* for times() */
//#include <sys/sysinfo.h> /* for sysinfo() */
#ifndef AT_CLKTCK
#define AT_CLKTCK 17
#endif
#if ENABLE_SELINUX
#define SELINIX_O_PREFIX "label,"
#define DEFAULT_O_STR (SELINIX_O_PREFIX "pid,user" USE_FEATURE_PS_TIME(",time"))
#else
#define DEFAULT_O_STR ("pid,user" USE_FEATURE_PS_TIME(",time"))
#endif
typedef struct {
uint16_t width;
char name[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 long seconds_since_boot;
#endif
char default_o[sizeof(DEFAULT_O_STR)];
};
#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 seconds_since_boot (G.seconds_since_boot)
#define default_o (G.default_o )
#if ENABLE_FEATURE_PS_TIME
/* for ELF executables, notes are pushed before environment and args */
static ptrdiff_t find_elf_note(ptrdiff_t findme)
{
ptrdiff_t *ep = (ptrdiff_t *) environ;
while (*ep++);
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)
{
//char buf[64];
struct sysinfo info;
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();
//if (open_read_close("/proc/uptime", buf, sizeof(buf) <= 0)
// bb_perror_msg_and_die("cannot read %s", "/proc/uptime");
//buf[sizeof(buf)-1] = '\0';
///sscanf(buf, "%llu", &seconds_since_boot);
sysinfo(&info);
seconds_since_boot = info.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)
@ -73,6 +210,34 @@ static void func_tty(char *buf, int size, const procps_status_t *ps)
snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
}
#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 = 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)
{
@ -86,29 +251,11 @@ static void func_nice(char *buf, int size, const procps_status_t *ps)
ps->???
}
static void func_etime(char *buf, int size, const procps_status_t *ps)
{
elapled time [[dd-]hh:]mm:ss
}
static void func_time(char *buf, int size, const procps_status_t *ps)
{
cumulative time [[dd-]hh:]mm:ss
}
static void func_pcpu(char *buf, int size, const procps_status_t *ps)
{
}
*/
typedef struct {
uint16_t width;
char name[6];
const char *header;
void (*f)(char *buf, int size, const procps_status_t *ps);
int ps_flags;
} ps_out_t;
static const ps_out_t out_spec[] = {
// Mandated by POSIX:
{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
@ -117,13 +264,17 @@ static const ps_out_t out_spec[] = {
{ 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
{ 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
{ 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
// { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_ },
#if ENABLE_FEATURE_PS_TIME
{ sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
#endif
// { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
// { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
// { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
// { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
// { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
// { sizeof("TIME" )-1, "time" ,"TIME" ,func_time ,PSSCAN_ },
#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 by POSIX, but useful:
@ -133,31 +284,6 @@ static const ps_out_t out_spec[] = {
#endif
};
#if ENABLE_SELINUX
#define SELINIX_O_PREFIX "label,"
#define DEFAULT_O_STR SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
#else
#define DEFAULT_O_STR "pid,user" /* TODO: ,vsz,stat */ ",args"
#endif
struct globals {
ps_out_t* out;
int out_cnt;
int print_header;
int need_flags;
char *buffer;
unsigned terminal_width;
char default_o[sizeof(DEFAULT_O_STR)];
};
#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 default_o (G.default_o )
static ps_out_t* new_out_t(void)
{
int i = out_cnt++;