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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2006-11-05 00:45:47 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2006-11-05 00:45:47 +0000
commit9494919ea5116075e16daac1355265b023419cdc (patch)
treea6743775e25864bf7f1e656283752df7d988de36 /procps
parentaae0311356b4458e3a62fb19af656e00323e3bf1 (diff)
downloadbusybox-9494919ea5116075e16daac1355265b023419cdc.tar.gz
busybox-9494919ea5116075e16daac1355265b023419cdc.tar.bz2
ps: implement POSIX-like options, most notably -o
(activated by CONFIG_DESKTOP)
Diffstat (limited to 'procps')
-rw-r--r--procps/ps.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/procps/ps.c b/procps/ps.c
index 2ff6e77d4..3cb86e49c 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -9,6 +9,279 @@
#include "busybox.h"
+#if ENABLE_DESKTOP
+
+/* Print value to buf, max size+1 chars (including trailing '\0') */
+
+void func_user(char *buf, int size, const procps_status_t *ps)
+{
+ safe_strncpy(buf, get_cached_username(ps->uid), size+1);
+}
+
+void func_comm(char *buf, int size, const procps_status_t *ps)
+{
+ safe_strncpy(buf, ps->comm, size+1);
+}
+
+void func_args(char *buf, int size, const procps_status_t *ps)
+{
+ buf[0] = '\0';
+ if (ps->cmd)
+ safe_strncpy(buf, ps->cmd, size+1);
+ else if (size >= 2)
+ snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
+}
+
+void func_pid(char *buf, int size, const procps_status_t *ps)
+{
+ snprintf(buf, size+1, "%*u", size, ps->pid);
+}
+
+void func_ppid(char *buf, int size, const procps_status_t *ps)
+{
+ snprintf(buf, size+1, "%*u", size, ps->ppid);
+}
+
+void func_pgid(char *buf, int size, const procps_status_t *ps)
+{
+ snprintf(buf, size+1, "%*u", size, ps->pgid);
+}
+
+void func_rss(char *buf, int size, const procps_status_t *ps)
+{
+ char buf5[5];
+ smart_ulltoa5( ((unsigned long long)ps->rss) << 10, buf5);
+ snprintf(buf, size+1, "%.*s", size, buf5);
+}
+
+/*
+void func_nice(char *buf, int size, const procps_status_t *ps)
+{
+ ps->???
+}
+
+void func_etime(char *buf, int size, const procps_status_t *ps)
+{
+ elapled time [[dd-]hh:]mm:ss
+}
+
+void func_time(char *buf, int size, const procps_status_t *ps)
+{
+ cumulative time [[dd-]hh:]mm:ss
+}
+
+void func_pcpu(char *buf, int size, const procps_status_t *ps)
+{
+}
+
+void func_tty(char *buf, int size, const procps_status_t *ps)
+{
+}
+*/
+
+typedef struct {
+ char name[8];
+ const char *header;
+ void (*f)(char *buf, int size, const procps_status_t *ps);
+ int ps_flags;
+ int width;
+} ps_out_t;
+
+static const ps_out_t out_spec[] = {
+// Mandated by POSIX:
+ { "user" ,"USER" ,func_user ,PSSCAN_UIDGID,8 },
+ { "comm" ,"COMMAND",func_comm ,PSSCAN_COMM ,16 },
+ { "args" ,"COMMAND",func_args ,PSSCAN_CMD|PSSCAN_COMM,256 },
+ { "pid" ,"PID" ,func_pid ,PSSCAN_PID ,5 },
+ { "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID ,5 },
+ { "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID ,5 },
+// { "etime" ,"ELAPSED",func_etime ,PSSCAN_ ,sizeof("ELAPSED")-1 },
+// { "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID,sizeof("GROUP" )-1 },
+// { "nice" ,"NI" ,func_nice ,PSSCAN_ ,sizeof("NI" )-1 },
+// { "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ ,sizeof("%CPU" )-1 },
+// { "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
+// { "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER" )-1 },
+// { "time" ,"TIME" ,func_time ,PSSCAN_ ,sizeof("TIME" )-1 },
+// { "tty" ,"TT" ,func_tty ,PSSCAN_ ,sizeof("TT" )-1 },
+// { "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ ,4 },
+// Not mandated by POSIX:
+ { "rss" ,"RSS" ,func_rss ,PSSCAN_RSS ,4 },
+};
+
+#define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )
+
+static ps_out_t* out;
+static int out_cnt;
+static int print_header;
+static int ps_flags;
+static char *buffer;
+static unsigned terminal_width;
+
+
+static ps_out_t* new_out_t(void)
+{
+ int i = out_cnt++;
+ out = xrealloc(out, out_cnt * sizeof(*out));
+ return &out[i];
+}
+
+static const ps_out_t* find_out_spec(const char *name)
+{
+ int i;
+ for (i = 0; i < VEC_SIZE(out_spec); i++) {
+ if (!strcmp(name, out_spec[i].name))
+ return &out_spec[i];
+ }
+ bb_error_msg_and_die("bad -o argument '%s'", name);
+}
+
+static void parse_o(char* opt)
+{
+ ps_out_t* new;
+ // POSIX: "-o is blank- or comma-separated list" (FIXME)
+ char *comma, *equal;
+ while (1) {
+ comma = strchr(opt, ',');
+ equal = strchr(opt, '=');
+ if (comma && (!equal || equal > comma)) {
+ *comma = '\0';
+ *new_out_t() = *find_out_spec(opt);
+ *comma = ',';
+ opt = comma + 1;
+ continue;
+ }
+ break;
+ }
+ new = new_out_t();
+ if (equal)
+ *equal = '\0';
+ *new = *find_out_spec(opt);
+ if (equal) {
+ *equal = '=';
+ new->header = equal + 1;
+ // POSIX: the field widths shall be ... at least as wide as
+ // the header text (default or overridden value).
+ // If the header text is null, such as -o user=,
+ // the field width shall be at least as wide as the
+ // default header text
+ if (new->header[0]) {
+ new->width = strlen(new->header);
+ print_header = 1;
+ }
+ } else
+ print_header = 1;
+}
+
+static void post_process(void)
+{
+ int i;
+ int width = 0;
+ for (i = 0; i < out_cnt; i++) {
+ ps_flags |= out[i].ps_flags;
+ if (out[i].header[0]) {
+ print_header = 1;
+ }
+ width += out[i].width + 1; /* "FIELD " */
+ }
+ buffer = xmalloc(width + 1); /* for trailing \0 */
+}
+
+static void format_header(void)
+{
+ int i;
+ ps_out_t* op;
+ char *p = buffer;
+ if (!print_header)
+ return;
+ i = 0;
+ if (out_cnt) {
+ while (1) {
+ op = &out[i];
+ if (++i == out_cnt) /* do not pad last field */
+ break;
+ p += sprintf(p, "%-*s ", op->width, op->header);
+ }
+ strcpy(p, op->header);
+ }
+ printf("%.*s\n", terminal_width, buffer);
+}
+
+static void format_process(const procps_status_t *ps)
+{
+ int i, len;
+ char *p = buffer;
+ i = 0;
+ if (out_cnt) while (1) {
+ out[i].f(p, out[i].width, ps);
+ // POSIX: Any field need not be meaningful in all
+ // implementations. In such a case a hyphen ( '-' )
+ // should be output in place of the field value.
+ if (!*p) {
+ *p++ = '-';
+ *p = '\0';
+ }
+ len = strlen(p);
+ p += len;
+ len = out[i].width - len + 1;
+ if (++i == out_cnt) /* do not pad last field */
+ break;
+ while (len--)
+ *p++ = ' ';
+ *p = '\0';
+ }
+ printf("%.*s\n", terminal_width, buffer);
+}
+
+/* Cannot be const: parse_o() will choke */
+static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";
+
+int ps_main(int argc, char **argv)
+{
+ procps_status_t *p;
+ llist_t* opt_o = NULL;
+
+ // POSIX:
+ // -a Write information for all processes associated with terminals
+ // Implementations may omit session leaders from this list
+ // -A Write information for all processes
+ // -d Write information for all processes, except session leaders
+ // -e Write information for all processes (equivalent to -A.)
+ // -f Generate a full listing
+ // -l Generate a long listing
+ // -o col1,col2,col3=header
+ // Select which columns to distplay
+ /* We allow (and ignore) most of the above. FIXME */
+ opt_complementary = "o::";
+ getopt32(argc, argv, "o:aAdefl", &opt_o);
+ if (opt_o) {
+ opt_o = rev_llist(opt_o);
+ do {
+ parse_o(opt_o->data);
+ opt_o = opt_o->link;
+ } while (opt_o);
+ } else
+ parse_o(default_o);
+ post_process();
+
+ terminal_width = INT_MAX;
+ if (isatty(1)) {
+ get_terminal_width_height(1, &terminal_width, NULL);
+ terminal_width--;
+ }
+ format_header();
+
+ p = NULL;
+ while ((p = procps_scan(p, ps_flags))) {
+ format_process(p);
+ }
+
+ return EXIT_SUCCESS;
+}
+
+
+#else /* !ENABLE_DESKTOP */
+
+
int ps_main(int argc, char **argv)
{
procps_status_t *p = NULL;
@@ -111,3 +384,5 @@ int ps_main(int argc, char **argv)
clear_username_cache();
return EXIT_SUCCESS;
}
+
+#endif