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-rw-r--r--toys/posix/ps.c91
1 files changed, 57 insertions, 34 deletions
diff --git a/toys/posix/ps.c b/toys/posix/ps.c
index b204962b..8aaeb933 100644
--- a/toys/posix/ps.c
+++ b/toys/posix/ps.c
@@ -91,9 +91,10 @@ config PS
Command line -o fields:
- ARGS Command line (argv[] -path) CMD COMM, or ARGS with -f
- CMDLINE Command line (argv[]) COMM Original command name (stat[2])
- COMMAND Command name (argv[0]) NAME Command name (argv[0] -path)
+ ARGS Command line (argv[] -path) CMD COMM, or ARGS with -f
+ CMDLINE Command line (argv[]) COMM Original command name (stat[2])
+ COMMAND Command name (/proc/$PID/exe) NAME Command name (COMMAND -path)
+ TNAME Thread name (argv[0] of $PID)
Process attribute -o FIELDs:
@@ -324,7 +325,7 @@ enum {
// Data layout in toybuf
struct carveup {
long long slot[SLOT_count]; // data (see enum above)
- unsigned short offset[5]; // offset of fields in str[] (skip name, always 0)
+ unsigned short offset[6]; // offset of fields in str[] (skip name, always 0)
char state;
char str[]; // name, tty, command, wchan, attr, cmdline
};
@@ -346,8 +347,8 @@ struct typography {
// String fields
{"COMM", -15, -1}, {"TTY", -8, -2}, {"WCHAN", -6, -3}, {"LABEL", -30, -4},
- {"COMMAND", -27, -5}, {"CMDLINE", -27, -6}, {"ARGS", -27, -6},
- {"NAME", -15, -6}, {"CMD", -27, -1},
+ {"NAME", -15, -5}, {"TNAME", -15, -7}, {"COMMAND", -27, -5},
+ {"CMDLINE", -27, -6}, {"ARGS", -27, -6}, {"CMD", -27, -1},
// user/group
{"UID", 5, SLOT_uid}, {"USER", -8, 64|SLOT_uid}, {"RUID", 4, SLOT_ruid},
@@ -438,15 +439,18 @@ static char *string_field(struct carveup *tb, struct strawberry *field)
// String fields
} else if (sl < 0) {
- // If there's data after argv[0], insert null or space as appropriate
- if (slot[SLOT_argv0len])
- tb->str[tb->offset[4]+slot[SLOT_argv0len]] = (which==PS_NAME) ? 0 : ' ';
out = tb->str;
sl *= -1;
// First string slot has offset 0, others are offset[-slot-2]
if (--sl) out += tb->offset[--sl];
- if (which==PS_ARGS)
- for (s = out; *s && *s != ' '; s++) if (*s == '/') out = s+1;
+ if (which==PS_ARGS || which==PS_NAME) {
+ int i;
+
+ s = out;
+ for (i = 0; (which==PS_ARGS) ? i < slot[SLOT_argv0len] : out[i]; i++)
+ if (out[i] == '/') s = out+i+1;
+ out = s;
+ }
if (which>PS_COMMAND && (!*out || *slot != slot[SLOT_tid]))
sprintf(out = buf, "[%s]", tb->str);
@@ -545,13 +549,15 @@ static char *string_field(struct carveup *tb, struct strawberry *field)
static void show_ps(struct carveup *tb)
{
struct strawberry *field;
- int pad, len, width = TT.width, abslen, adjlen, olen, extra = 0;
+ int pad, len, width = TT.width, abslen, sign, olen, extra = 0;
// Loop through fields to display
for (field = TT.fields; field; field = field->next) {
char *out = string_field(tb, field);
// Output the field, appropriately padded
+
+ // Minimum one space between each field
if (field != TT.fields) {
putchar(' ');
width--;
@@ -560,23 +566,24 @@ static void show_ps(struct carveup *tb)
// Don't truncate number fields, but try to reclaim extra offset from later
// fields that can naturally be shorter
abslen = abs(field->len);
- adjlen = field->len;
+ sign = field->len<0 ? -1 : 1;
if (field->which<=PS_BIT || extra) olen = strlen(out);
if (field->which<=PS_BIT && olen>abslen) {
+ // overflow but remember by how much
extra += olen-abslen;
abslen = olen;
- adjlen = (adjlen<0) ? -olen : olen;
} else if (extra && olen<abslen) {
+ // If later fields have slack space, take back overflow
olen = abslen-olen;
if (olen>extra) olen = extra;
abslen -= olen;
- adjlen -= (adjlen<0) ? -olen : olen;
extra -= olen;
}
- len = width;
- pad = 0;
- if (field->next || field->len>0)
- len = abs(pad = width<abslen ? width : adjlen);
+ if (abslen>width) abslen = width;
+ len = pad = abslen;
+ pad *= sign;
+ // If last field is left justified, no trailing spaces.
+ if (!field->next && sign<0) pad = 0;
if (TT.tty) width -= draw_trim(out, pad, len);
else width -= printf("%*.*s", pad, len, out);
@@ -591,12 +598,13 @@ static void show_ps(struct carveup *tb)
static int get_ps(struct dirtree *new)
{
struct {
- char *name;
- long long bits;
+ char *name; // Path under /proc/$PID directory
+ long long bits; // Only fetch extra data if an -o field is displaying it
} fetch[] = {
// sources for carveup->offset[] data
{"fd/", _PS_TTY}, {"wchan", _PS_WCHAN}, {"attr/current", _PS_LABEL},
- {"exe", _PS_COMMAND}, {"cmdline", _PS_CMDLINE|_PS_ARGS|_PS_NAME}
+ {"exe", _PS_COMMAND|_PS_NAME}, {"cmdline", _PS_CMDLINE|_PS_ARGS|_PS_TNAME},
+ {"", _PS_TNAME}
};
struct carveup *tb = (void *)toybuf;
long long *slot = tb->slot;
@@ -733,16 +741,31 @@ static int get_ps(struct dirtree *new)
sprintf(buf, "%lld/%s", *slot, fetch[j].name);
// For exe we readlink instead of read contents
- if (j==3) {
- // Thread doesn't have exe, so use parent's
- if (TT.threadparent && TT.threadparent->extra) {
- struct carveup *ptb = (void *)TT.threadparent->extra;
- i = strlen(s = ptb->str+ptb->offset[3]);
+ if (j==3 || j==5) {
+ struct carveup *ptb = 0;
+ int k;
+
+ // Thread doesn't have exe or argv[0], so use parent's
+ if (TT.threadparent && TT.threadparent->extra)
+ ptb = (void *)TT.threadparent->extra;
+
+ if (j==3 && !ptb) {
+ if ((len = readlinkat(fd, buf, buf, len))<1) len = 0;
+ } else {
+ if (j==3) i = strlen(s = ptb->str+ptb->offset[3]);
+ else {
+ if (!ptb || tb->slot[SLOT_argv0len]) ptb = tb;
+ i = ptb->slot[SLOT_argv0len];
+ s = ptb->str+ptb->offset[4];
+ while (-1!=(k = stridx(s, '/')) && k<i) {
+ s += k+1;
+ i -= k+1;
+ }
+ }
if (i<len) len = i;
- memcpy(buf, s, i);
- buf[len] = 0;
- } else if ((len = readlinkat(fd, buf, buf, len))>0) buf[len] = 0;
- else *buf = len = 0;
+ memcpy(buf, s, len);
+ }
+ buf[len] = 0;
// If it's not the TTY field, data we want is in a file.
// Last length saved in slot[] is command line (which has embedded NULs)
@@ -812,9 +835,9 @@ static int get_ps(struct dirtree *new)
} else if (!TT.tty && c<' ') c = '?';
buf[i] = c;
}
- // Store end of argv[0] so NAME and CMDLINE can differ.
+ // Store end of argv[0] so ARGS and CMDLINE can differ.
// We do it for each file string slot but last is cmdline, which sticks.
- slot[SLOT_argv0len] = temp; // Position of _first_ NUL
+ slot[SLOT_argv0len] = temp ? temp : len; // Position of _first_ NUL
} else *buf = len = 0;
}
@@ -1187,7 +1210,7 @@ void ps_main(void)
if (!(toys.optflags&(FLAG_k|FLAG_M))) TT.show_process = (void *)show_ps;
TT.match_process = ps_match_process;
dt = dirtree_read("/proc",
- ((toys.optflags&FLAG_T) || (TT.bits&(_PS_TID|_PS_TCNT)))
+ ((toys.optflags&FLAG_T) || (TT.bits&(_PS_TID|_PS_TCNT|_PS_TNAME)))
? get_threads : get_ps);
if (toys.optflags&(FLAG_k|FLAG_M)) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 23:14:08 +0000