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-rw-r--r--toys/pending/ps.c531
1 files changed, 169 insertions, 362 deletions
diff --git a/toys/pending/ps.c b/toys/pending/ps.c
index 3427557a..43818ee8 100644
--- a/toys/pending/ps.c
+++ b/toys/pending/ps.c
@@ -1,410 +1,217 @@
-/* ps.c - Show running process statistics.
+/* ps.c - show process list
*
- * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
- * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ * Copyright 2015 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
+ * And http://kernel.org/doc/Documentation/filesystems/proc.txt Table 1-4
+ * And linux kernel source fs/proc/array.c function do_task_stat()
+ *
+ * Deviation from posix: no -n
-USE_PS(NEWTOY(ps, ">0o*T", TOYFLAG_BIN))
+USE_PS(NEWTOY(ps, "aAdeo*", TOYFLAG_USR|TOYFLAG_BIN))
config PS
bool "ps"
default n
help
- usage: ps [-o COL1,COL2=HEADER] [-T]
-
- Show list of processes
-
- -a Show all processes with a tty
- -A Show all processes
- -o Select columns for display
- -T Show threads
+ usage: ps [-Aade] [-fl] [-gG GROUP] [-o FIELD] [-p PID] [-t TTY] [-u USER]
+
+ List processes.
+
+ -A All processes
+ -a Processes with terminals, except session leaders
+ -d Processes that aren't session leaders
+ -e Same as -A
+
+
+ -f Full listing
+ -g Processes belonging to these session leaders
+ -G Processes with these real group IDs
+ -l Long listing
+ -o Show FIELDS for each process
+ -p select by PID
+ -t select by TTY
+ -u select by USER
+ -U select by USER
+
+ GROUP, FIELD, PID, TTY, and USER are comma separated lists.
+
+ OUTPUT (-o) FIELDS:
+
+ S Linux defines the process state letters as:
+ R (running) S (sleeping) D (disk sleep) T (stopped) t (tracing stop)
+ Z (zombie) X (dead) x (dead) K (wakekill) W (waking)
+ F Process flags (PF_*) from linux source file include/sched.h
+ (in octal rather than hex because posix inexplicably says so)
+
+ Default is PID,TTY,TIME,CMD With -f UID,PID,PPID,C,STIME,TTY,TIME,CMD
+ With -l F,S,UID,PID,PPID,C,PRI,NI,ADDR,SZ,WCHAN,TTY,TIME,CMD
*/
#define FOR_ps
#include "toys.h"
GLOBALS(
- struct arg_list *llist_o;
- unsigned screen_width;
+ struct arg_list *o;
- void *o;
+ unsigned width;
+ dev_t tty;
+ void *oo;
)
-#define BUFF_SIZE 1024
-struct header_list {
- struct header_list *next;
- char *name, *header, *format;
- int width, position;
-};
+/*
+ l l fl a fl fl l l l l l f a a a
+ F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
+ ruser user rgroup group pid ppid pgid pcpu vsz nice etime time tty comm args
-// create list of header attributes taking care of -o (-o ooid=MOM..)
-// and width of attributes.
-static void list_add(struct header_list *data, char *c_data)
+ todo: thread support /proc/$d/task/%d/stat
+ man page: F flags mean...
+*/
+
+// dirtree callback.
+// toybuf used as: 1024 /proc/$PID/stat, 1024 slot[], 2048 /proc/$PID/cmdline
+static int do_ps(struct dirtree *new)
{
- struct header_list *temp = TT.o, *new;
+ long long *slot = (void *)(toybuf+1024);
+ char *name, *s, state;
+ int nlen, slots, i, field, width = TT.width, idxes[] = {0, -1, -2, -3};
+ struct passwd *pw;
+ struct group *gr;
- memcpy(new = xmalloc(sizeof(*new)), data, sizeof(*new));
- if (c_data) new->header = c_data;
- else new->header = xstrdup(data->header);
- if (c_data && (strlen(c_data) > data->width)) new->width = strlen(c_data);
+width=18;
- if (temp) {
- while (temp->next) temp = temp->next;
- temp->next = new;
- } else TT.o = new;
-}
+ if (!new->parent) return DIRTREE_RECURSE;
+ if (!(*slot = atol(new->name))) return 0;
-// parse -o arguments
-static void parse_o(struct header_list *hdr)
-{
- int i;
- char *ptr, *str, *temp;
- struct arg_list *node = TT.llist_o;
-
- while (node) {
- char *s = str = xstrdup(node->arg);
-
- i = 0;
- while (str) {
- if ((ptr = strsep(&str, ","))) { //seprate list
- if ((temp = strchr(ptr, '='))) { // Handle ppid = MOM
- *temp++ = 0;
- while (hdr[i].name) {
- // search from default header
- if (!(strcmp(hdr[i].name, ptr))) {
- //handle condition like ppid = M,OM
- if (str) ptr = xmprintf("%s,%s", temp, str);
- else ptr = xmprintf("%s", temp);
- list_add(hdr+i, ptr);
- break;
- }
- i++;
- }
- if (!hdr[i].name) perror_exit("Invalid arg for -o option");
- break;
- } else {
- while (hdr[i].name) {
- if (!(strcmp(hdr[i].name, ptr))) {
- list_add(hdr+i, 0);
- break;
- }
- i++;
- }
- if (!hdr[i].name) error_exit("bad -o");
- i = 0;
- }
- }
- }
- free(s);
- node = node->next;
- }
-}
+ // name field limited to 256 bytes by VFS, plus 40 fields * max 20 chars:
+ // 1000-ish total, but some forced zero so actually there's headroom.
+ sprintf(toybuf, "%lld/stat", *slot);
+ if (!readfileat(dirtree_parentfd(new), toybuf, toybuf, 1024)) return 0;
-//get uid/gid for processes.
-static void get_uid_gid(char *p, char *id_str, unsigned *id)
-{
- FILE *f;
-
- if(!p) return;
- f = xfopen(p, "r");
- while (fgets(toybuf, BUFF_SIZE, f)) {
- if (!strncmp(toybuf, id_str, strlen(id_str))) {
- sscanf(toybuf, "%*s %u", id);
- break;
- }
- }
- fclose(f);
-}
+ // parse oddball fields (name and state)
+ if (!(s = strchr(toybuf, '('))) return 0;
+ for (name = ++s; *s != ')'; s++) if (!*s) return 0;
+ nlen = s++-name;
+ if (1>sscanf(++s, " %c%n", &state, &i)) return 0;
-//get etime for processes.
-void get_etime(unsigned long s_time)
-{
- unsigned long min;
- unsigned sec;
- struct sysinfo info;
- char *temp;
-
- sysinfo(&info);
- min = s_time/sysconf(_SC_CLK_TCK);
- min = info.uptime - min;
- sec = min % 60;
- min = min / 60;
- temp = xmprintf("%3lu:%02u", min,sec);
- xprintf("%*.*s",7,7,temp);
- free(temp);
-}
+ // parse numeric fields
+ for (slots = 1; slots<100; slots++)
+ if (1>sscanf(s += i, " %lld%n", slot+slots, &i)) break;
-//get time attributes for processes.
-void get_time(unsigned long s_time, unsigned long u_time)
-{
- unsigned long min;
- unsigned sec;
- char *temp;
-
- min = (s_time + u_time)/sysconf(_SC_CLK_TCK);
- sec = min % 60;
- min = min / 60;
- temp = xmprintf("%3lu:%02u", min,sec);
- xprintf("%*.*s",6,6,temp);
- free(temp);
-}
+ // skip entries we don't care about.
+ if ((toys.optflags&(FLAG_a|FLAG_d)) && getsid(*slot)==*slot) return 0;
+ if ((toys.optflags&FLAG_a) && !slot[4]) return 0;
+ if (!(toys.optflags*(FLAG_a|FLAG_d|FLAG_A|FLAG_e)) && TT.tty!=slot[4])
+ return 0;
-// read command line taking care of in between NUL's in command line
-static void read_cmdline(int fd, char *cmd_ptr)
-{
- int size = read(fd, cmd_ptr, BUFF_SIZE); //sizeof(cmd_buf)
+ // default: pidi=1 user time args
- cmd_ptr[size] = '\0';
- while (--size > 0 && cmd_ptr[size] == '\0'); //reach to last char
+ for (field = 0; field<ARRAY_LEN(idxes); field++) {
+ char *out = toybuf+2048;
+ int idx = idxes[field];
- while (size >= 0) {
- if ((unsigned char)cmd_ptr[size] < ' ') cmd_ptr[size] = ' ';
- size--;
- }
-}
+ // Default: unsupported
+ sprintf(out, "-");
-// get the processes stats and print the stats
-// corresponding to header attributes.
-static void do_ps_line(int pid, int tid)
-{
- char *stat_buff = toybuf + BUFF_SIZE, *cmd_buff = toybuf + (2*BUFF_SIZE);
- char state[4] = {0,};
- int tty, tty_major, tty_minor, fd, n, nice, width_counter = 0;
- struct stat stats;
- struct passwd *pw;
- struct group *gr;
- char *name, *user, *group, *ruser, *rgroup, *ptr;
- long rss;
- unsigned long stime, utime, start_time, vsz;
- unsigned ppid, ruid, rgid, pgid;
- struct header_list *p = TT.o;
-
- sprintf(stat_buff, "/proc/%d", pid);
- if(stat(stat_buff, &stats)) return;
-
- if (tid) {
- if (snprintf(stat_buff, BUFF_SIZE, "/proc/%d/task/%d/stat", pid, tid) >= BUFF_SIZE) return;
- if (snprintf(cmd_buff, BUFF_SIZE, "/proc/%d/task/%d/cmdline", pid, tid) >= BUFF_SIZE) return;
- } else {
- if (snprintf(stat_buff, BUFF_SIZE, "/proc/%d/stat", pid) >= BUFF_SIZE) return;
- if (snprintf(cmd_buff, BUFF_SIZE, "/proc/%d/cmdline", pid) >= BUFF_SIZE) return;
- }
+ // Our tests here are in octal to match \123 character escapes in typos[]
- fd = xopen(stat_buff, O_RDONLY);
- n = readall(fd, stat_buff, BUFF_SIZE);
- xclose(fd);
- if (n < 0) return;
- stat_buff[n] = 0; //Null terminate the buffer.
- ptr = strchr(stat_buff, '(');
- ptr++;
- name = ptr;
- ptr = strrchr(stat_buff, ')');
- *ptr = '\0'; //unecessary if?
- name = xmprintf("[%s]", name);
- ptr += 2; // goto STATE
- n = sscanf(ptr, "%c %u %u %*u %d %*s %*s %*s %*s %*s %*s "
- "%lu %lu %*s %*s %*s %d %*s %*s %lu %lu %ld",
- &state[0],&ppid, &pgid, &tty, &utime, &stime,
- &nice,&start_time, &vsz,&rss);
-
- if (tid) pid = tid;
- vsz >>= 10; //Convert into KB
- rss = rss * 4; //Express in pages
- tty_major = (tty >> 8) & 0xfff;
- tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
-
- if (vsz == 0 && state[0] != 'Z') state[1] = 'W';
- else state[1] = ' ';
- if (nice < 0 ) state[2] = '<';
- else if (nice) state[2] = 'N';
- else state[2] = ' ';
-
- if (tid) {
- if (snprintf(stat_buff, BUFF_SIZE, "/proc/%d/task/%d/status", pid, tid) >= BUFF_SIZE)
- goto clean;
- } else {
- if (snprintf(stat_buff, BUFF_SIZE, "/proc/%d/status", pid) >= BUFF_SIZE)
- goto clean;
- }
+ // Print a raw stat field?
+ if (idx<0300)
+ sprintf(out, (char *[]){"%lld","%llx","%llo"}[idx>>6], slot[idx&63]);
- fd = -1;
- while (p) {
- int width;
- width = p->width;
- width_counter += (width + 1); //how much screen we hv filled, +1, extra space b/w headers
- switch (p->position) {
- case 0:
- pw = getpwuid(stats.st_uid);
- if (!pw) user = xmprintf("%d",(int)stats.st_uid);
- else user = xmprintf("%s", pw->pw_name);
- printf("%-*.*s", width, width, user);
- free(user);
- break;
- case 1:
- gr = getgrgid(stats.st_gid);
- if (!gr) group = xmprintf("%d",(int)stats.st_gid);
- else group = xmprintf("%s", gr->gr_name);
- printf("%-*.*s", width, width, group);
- free(group);
- break;
- case 2:
- name[strlen(name) - 1] = '\0';
- printf("%-*.*s", width,width, name + 1);
- name[strlen(name)] = ']'; //Refill it for further process.
- break;
- case 3:
- {
- int j = 0;
- width_counter -= width;
- if(p->next) j = width; //is args is in middle. ( -o pid,args,ppid)
- else j = (TT.screen_width - width_counter % TT.screen_width); //how much screen left.
- if (fd == -1) fd = open(cmd_buff, O_RDONLY); //don't want to die
- else xlseek(fd, 0, SEEK_SET);
- if (fd < 0) cmd_buff[0] = 0;
- else read_cmdline(fd, cmd_buff);
- if (cmd_buff[0]) printf("%-*.*s", j, j, cmd_buff);
- else printf("%-*.*s", j, j, name);
- width_counter += width;
- break;
+ else if (idx == 0300) sprintf(out, "%c", state); // S
+ else if (idx == 0301 || idx == 0302) { // UID and USER
+ sprintf(out, "%d", new->st.st_uid);
+ if (idx == 302 || (toys.optflags&FLAG_f)) {
+ struct passwd *pw = getpwuid(new->st.st_uid);
+
+ if (pw) out = pw->pw_name;
+ }
+ } else if (idx == 0303); // C (unsupported for now)
+ else if (idx == 0304) // SZ
+ sprintf(out, "%lld", slot[22]/4096);
+ else if (idx == 0305) { // WCHAN
+ sprintf(toybuf+512, "%lld/wchan");
+ readfileat(dirtree_parentfd(new), toybuf+512, out, 2047);
+
+ // time
+ } else if (idx == -2) {
+ long seconds = (slot[11]+(idx==-3)*slot[12])/sysconf(_SC_CLK_TCK),
+ ll = 60*60*24;
+
+ for (s = out, i = 0; i<4; i++) {
+ if (i>1 || seconds > ll)
+ s += sprintf(s, "%*ld%c", 2*(i==3), seconds/ll, "-::"[i]);
+ ll /= i ? 60 : 24;
+ }
+
+ // Command line limited to 2k displayable. We could dynamically malloc, but
+ // it'd almost never get used, querying length of a proc file is awkward,
+ // fixed buffer is nommu friendly... Waiting for somebody to complain. :)
+ } else if (idx == -3) {
+ int fd, len = 0;
+
+ sprintf(out, "%lld/cmdline", *slot);
+ fd = openat(dirtree_parentfd(new), out, O_RDONLY);
+
+ if (fd != -1) {
+ if (0<(len = read(fd, out, 2047))) {
+ out[len] = 0;
+ for (i = 0; i<len; i++) if (out[i] < ' ') out[i] = ' ';
}
- case 4:
- printf("%*d", width, pid);
- break;
- case 5:
- printf("%*d", width, ppid);
- break;
- case 6:
- printf("%*d", width, pgid);
- break;
- case 7:
- get_etime(start_time);
- break;
- case 8:
- printf("%*d", width, nice);
- break;
- case 9:
- get_uid_gid(stat_buff, "Gid:", &rgid);
- gr = getgrgid(rgid);
- if (!gr) rgroup = xmprintf("%d",(int)stats.st_gid);
- else rgroup = xmprintf("%s", gr->gr_name);
- printf("%-*.*s", width, width, rgroup);
- free(rgroup);
- break;
- case 10:
- get_uid_gid(stat_buff, "Uid:", &ruid);
- pw = getpwuid(ruid);
- if (!pw) ruser = xmprintf("%d",(int)stats.st_uid);
- else ruser = xmprintf("%s", pw->pw_name);
- printf("%-*.*s", width, width, ruser);
- free(ruser);
- break;
- case 11:
- get_time(utime, stime);
- break;
- case 12:
- if (tty_major) {
- char *temp = xmprintf("%d,%d", tty_major,tty_minor);
- printf("%-*s", width, temp);
- free(temp);
- } else printf("%-*s", width, "?");
- break;
- case 13:
- printf("%*lu", width, vsz);
- break;
- case 14:
- printf("%-*s", width, state);
- break;
- case 15:
- printf("%*lu", width, rss);
- break;
+ close(fd);
+ }
+ if (len<1) sprintf(out, "[%.*s]", nlen, name);
}
- p = p->next;
- xputc(' '); //space char
+
+ printf(" %*.*s", width, width, out);
}
- if (fd >= 0) xclose(fd);
xputc('\n');
-clean:
- free(name);
-}
-// Do stats for threads (for -T option)
-void do_ps_threads(int pid)
-{
- DIR *d;
- int tid;
- struct dirent *de;
- char *tmp = xmprintf("/proc/%d/task",pid);
-
- if (!(d = opendir(tmp))) {
- free(tmp);
- return;
- }
- while ((de = readdir(d))) {
- if (isdigit(de->d_name[0])) {
- tid = atoi(de->d_name);
- if (tid == pid) continue;
- do_ps_line(pid, tid);
- }
- }
- closedir(d);
- free(tmp);
+ return 0;
}
void ps_main(void)
{
- DIR *dp;
- struct dirent *entry;
- int pid;
- struct header_list *hdr, def_header[] = {
- {0, "user", "USER", "%-*s ", 8, 0},
- {0, "group", "GROUP", "%-*s ", 8, 1},
- {0, "comm", "COMMAND", "%-*s ",16, 2},
- {0, "args", "COMMAND", "%-*s ",30, 3},
- {0, "pid", "PID", "%*s ", 5, 4},
- {0, "ppid","PPID", "%*s ", 5, 5},
- {0, "pgid", "PGID", "%*s ", 5, 6},
- {0, "etime","ELAPSED", "%*s ", 7, 7},
- {0, "nice", "NI", "%*s ", 5, 8},
- {0, "rgroup","RGROUP", "%-*s ", 8, 9},
- {0, "ruser","RUSER", "%-*s ", 8, 10},
- {0, "time", "TIME", "%*s ", 6, 11},
- {0, "tty", "TT", "%-*s ", 6, 12},
- {0, "vsz","VSZ", "%*s ", 7, 13},
- {0, "stat", "STAT", "%-*s ", 4, 14},
- {0, "rss", "RSS", "%*s ", 4, 15},
-{0,0,0,0,0,0}
+ int i, fd = -1;
+ // Octal output code followed by header name
+ char *typos[] = {
+ "\207F", "\300S", "\301UID", "\0PID", "\02PPID", "\303C", "\20PRI",
+ "\21NI", "\34ADDR", "\304SZ", "\305WCHAN", "STIME", "TTY", "TIME", "CMD"
};
-
- TT.screen_width = 80; //default width
- terminal_size(&TT.screen_width, NULL);
-
- // Default pid, user, time, comm
- if (!TT.llist_o) {
- list_add(def_header+4, 0);
- list_add(def_header, 0);
- list_add(def_header+11, 0);
- list_add(def_header+3, 0);
- } else parse_o(def_header); // ARRAY_LEN(def_header)
-
- for (hdr = TT.o; hdr; hdr = hdr->next)
- printf(hdr->format , hdr->width, hdr->header);
- xputc('\n');
- if (!(dp = opendir("/proc"))) perror_exit("opendir");
- while ((entry = readdir(dp))) {
- if (!isdigit(*entry->d_name)) continue;
- pid = atoi(entry->d_name);
- do_ps_line(pid, 0);
- if (toys.optflags & FLAG_T) do_ps_threads(pid);
+ // l l fl a fl fl l l l l l f a a a
+ // F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
+ // 7
+
+ TT.width = 80;
+ terminal_size(&TT.width, 0);
+
+ // find controlling tty, falling back to /dev/tty if none
+ for (i = fd = 0; i < 4; i++) {
+ struct stat st;
+
+ if (i != 3 || -1 != (i = fd = open("/dev/tty", O_RDONLY))) {
+ if (isatty(i) && !fstat(i, &st)) {
+ TT.tty = st.st_rdev;
+ break;
+ }
+ }
}
- closedir(dp);
+ if (fd != -1) close(fd);
+
+ if (FLAG_o) {
+ printf("todo\n");
+ } else {
+ short def = 0x0807;
- while (CFG_TOYBOX_FREE) {
- struct header_list *temp = llist_pop(&TT.o);
+ if (toys.optflags&FLAG_f) def = 0x1e0f;
+ if (toys.optflags&FLAG_l) def = 0x7ff7;
- if (!temp) break;
- free(temp->header);
- free(temp);
+ // order of fields[] matches posix STDOUT section, so add enabled XSI
+ // defaults according to bitmask
}
+
+ printf("pid user time args\n");
+ dirtree_read("/proc", do_ps);
}
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