void (*show_process)(void *tb);
)
+/* Linked list of fields selected for display, in order, with :len and =title */
+
struct strawberry {
struct strawberry *next, *prev;
short which, len, reverse;
char forever[];
};
-/* The slot[] array is mostly populated from /proc/$PID/stat (kernel proc.txt
- * table 1-4) but we shift and repurpose fields, with the result being: */
+/* The function get_ps() reads all the data about one process, saving it in
+ * toybox as a struct carveup. Simple ps calls then pass toybuf directly to
+ * show_ps(), but features like sorting instead append a copy to a linked list
+ * for further processing once all processes have been read.
+ *
+ * struct carveup contains a slot[] array of 64 bit values, with the following
+ * data at each position in the array. Most is read from /proc/$PID/stat (see
+ * https://kernel.org/doc/Documentation/filesystems/proc.txt table 1-4) but
+ * we we replace several fields with don't use with other data. */
enum {
SLOT_pid, /*process id*/ SLOT_ppid, // parent process id
SLOT_flags, /*task flags*/ SLOT_minflt, // minor faults
SLOT_cminflt, /*minor faults+child*/ SLOT_majflt, // major faults
SLOT_cmajflt, /*major faults+child*/ SLOT_utime, // user+kernel jiffies
- SLOT_stime, /*kernel mode jiffies*/ SLOT_cutime, // utime+child
+ SLOT_stime, /*kernel mode jiffies*/ SLOT_cutime, // utime+child utime
SLOT_cstime, /*stime+child*/ SLOT_priority, // priority level
SLOT_nice, /*nice level*/ SLOT_numthreads,// thread count
SLOT_vmlck, /*locked memory*/ SLOT_starttime, // jiffies after boot
SLOT_policy, /*man sched_setscheduler*/SLOT_blkioticks,// IO wait time
SLOT_gtime, /*guest jiffies of task*/ SLOT_cgtime, // gtime+child
SLOT_startbss, /*data/bss address*/ SLOT_endbss, // end addr data+bss
- SLOT_upticks, /*46-19 (divisor for %)*/ SLOT_argv0len, // argv[0] length
+ SLOT_upticks, /*uptime-starttime*/ SLOT_argv0len, // argv[0] length
SLOT_uptime, /*si.uptime @read time*/ SLOT_vsz, // Virtual mem Size
SLOT_rss2, /*Resident Set Size*/ SLOT_shr, // Shared memory
SLOT_rchar, /*All bytes read*/ SLOT_wchar, // All bytes written
SLOT_tid, /*Thread ID*/ SLOT_tcount, // Thread count
SLOT_pcy, /*Android sched policy*/
- SLOT_count
+ SLOT_count /* Size of array */
};
+/* In addition to slot[], carevup contains 6 string fields to display
+ command name, tty device, selinux label... They're stored one after the
+ other in str[] (separated by null terminators), and offset[] contains the
+ starting position of each string after the first (which is always 0). */
+
// Data layout in toybuf
struct carveup {
long long slot[SLOT_count]; // data (see enum above)
- unsigned short offset[6]; // offset of fields in str[] (skip name, always 0)
+ unsigned short offset[6]; // offset of fields in str[] (skip CMD, always 0)
char state;
- char str[]; // name, tty, command, wchan, attr, cmdline
+ char str[]; // CMD, TTY, WCHAN, LABEL, COMM, ARGS, NAME
};
+/* The typos[] array lists all the types understood by "ps -o", I.E all the
+ * columns ps and top know how to display. Each entry has:
+ *
+ * name: the column name, displayed at top and used to select column with -o
+ *
+ * width: the display width. Fields are padded to this width when displaying
+ * to a terminal (negative means right justified). Strings are truncated
+ * to fit, numerical fields are padded but not truncated (although
+ * the display code reclaims unused padding from later fields to try to
+ * get the overflow back).
+ *
+ * slot: which slot[] out of carveup. Negative means it's a string field.
+ * Setting bit |64 requests extra display/sort processing.
+ *
+ * The TAGGED_ARRAY plumbing produces an enum of indexes, the "tag" is the
+ * first string argument and the prefix is the first argument to TAGGED_ARRAY
+ * so in this case "NAME" becomes PS_NAME which is the offset into typos[]
+ * for that entry, and also _PS_NAME (the bit position, 1<<PS_NAME).
+ * We record active columns in TT.bits, ala:
+ *
+ * if (TT.bits & _PS_NAME) printf("-o included PS_NAME");
+ */
+
// TODO: Android uses -30 for LABEL, but ideally it would auto-size.
// 64|slot means compare as string when sorting
struct typography {
char *name;
signed char width, slot;
} static const typos[] = TAGGED_ARRAY(PS,
- // Numbers
+ // Numbers. (What's in slot[] is what's displayed, sorted numerically.)
{"PID", 5, SLOT_pid}, {"PPID", 5, SLOT_ppid}, {"PRI", 3, SLOT_priority},
{"NI", 3, SLOT_nice}, {"ADDR", 4+sizeof(long), SLOT_eip},
{"SZ", 5, SLOT_vsize}, {"RSS", 6, SLOT_rss}, {"PGID", 5, SLOT_pgrp},
{"RTPRIO", 6, SLOT_rtprio}, {"SCH", 3, SLOT_policy}, {"CPU", 3, SLOT_taskcpu},
{"TID", 5, SLOT_tid}, {"TCNT", 4, SLOT_tcount}, {"BIT", 3, SLOT_bits},
- // String fields
+ // String fields (-1 is carveup->str, rest are str+offset[1-slot])
{"TTY", -8, -2}, {"WCHAN", -6, -3}, {"LABEL", -30, -4}, {"COMM", -27, -5},
{"NAME", -27, -7}, {"COMMAND", -27, -5}, {"CMDLINE", -27, -6},
{"ARGS", -27, -6}, {"CMD", -15, -1},
- // user/group
+ // user/group (may call getpwuid() or similar)
{"UID", 5, SLOT_uid}, {"USER", -12, 64|SLOT_uid}, {"RUID", 4, SLOT_ruid},
{"RUSER", -8, 64|SLOT_ruid}, {"GID", 8, SLOT_gid}, {"GROUP", -8, 64|SLOT_gid},
{"RGID", 4, SLOT_rgid}, {"RGROUP", -8, 64|SLOT_rgid},
- // clock displays
+ // clock displays (00:00:00)
{"TIME", 8, SLOT_utime}, {"ELAPSED", 11, SLOT_starttime},
{"TIME+", 9, SLOT_utime},
- // Percentage displays
+ // Percentage displays (fixed point, one decimal digit. 123 -> 12.3)
{"C", 1, SLOT_utime2}, {"%VSZ", 5, SLOT_vsize}, {"%MEM", 5, SLOT_rss},
{"%CPU", 4, SLOT_utime2},
- // human_readable
+ // human_readable (function human_readable() in lib, 1.23M, 1.4G, etc)
{"VIRT", 4, SLOT_vsz}, {"RES", 4, SLOT_rss2},
{"SHR", 4, SLOT_shr}, {"READ", 6, SLOT_rchar}, {"WRITE", 6, SLOT_wchar},
{"IO", 6, SLOT_iobytes}, {"DREAD", 6, SLOT_rbytes},
{"DWRITE", 6, SLOT_wbytes}, {"SWAP", 6, SLOT_swap}, {"DIO", 6, SLOT_diobytes},
- // Misc
+ // Misc (special cases)
{"STIME", 5, SLOT_starttime}, {"F", 1, 64|SLOT_flags}, {"S", -1, 64},
{"STAT", -5, 64}, {"PCY", 3, 64|SLOT_pcy},
);
TT.pgrep.self = getpid();
- // No signal names start with "L", so no need for "L: " parsing.
+ // No signal names start with "L", so no need for "L: " in optstr.
if (TT.pgrep.L && 1>(TT.pgrep.signal = sig_to_num(TT.pgrep.L)))
error_exit("bad -L '%s'", TT.pgrep.L);
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