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-rw-r--r--libbb/procps.c133
1 files changed, 71 insertions, 62 deletions
diff --git a/libbb/procps.c b/libbb/procps.c
index 845a214..48e60a7 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -138,8 +138,8 @@ static unsigned long fast_strtoul_16(char **endptr)
return n;
}
/* TOPMEM uses fast_strtoul_10, so... */
-#undef ENABLE_FEATURE_FAST_TOP
-#define ENABLE_FEATURE_FAST_TOP 1
+# undef ENABLE_FEATURE_FAST_TOP
+# define ENABLE_FEATURE_FAST_TOP 1
#endif
#if ENABLE_FEATURE_FAST_TOP
@@ -223,14 +223,16 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
}
#endif
- /* After this point we have to break, not continue
- * ("continue" would mean that current /proc/NNN
- * is not a valid process info) */
+ /* After this point we can:
+ * "break": stop parsing, return the data
+ * "continue": try next /proc/XXX
+ */
memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
sp->pid = pid;
- if (!(flags & ~PSSCAN_PID)) break;
+ if (!(flags & ~PSSCAN_PID))
+ break; /* we needed only pid, we got it */
#if ENABLE_SELINUX
if (flags & PSSCAN_CONTEXT) {
@@ -243,7 +245,7 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
if (flags & PSSCAN_UIDGID) {
if (stat(filename, &sb))
- break;
+ continue; /* process probably exited */
/* Effective UID/GID, not real */
sp->uid = sb.st_uid;
sp->gid = sb.st_gid;
@@ -259,10 +261,10 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
strcpy(filename_tail, "stat");
n = read_to_buf(filename, buf);
if (n < 0)
- break;
+ continue; /* process probably exited */
cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
/*if (!cp || cp[1] != ' ')
- break;*/
+ continue;*/
cp[0] = '\0';
if (sizeof(sp->comm) < 16)
BUG_comm_size();
@@ -282,12 +284,12 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
"%lu " /* start_time */
"%lu " /* vsize */
"%lu " /* rss */
-#if ENABLE_FEATURE_TOP_SMP_PROCESS
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
"%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
"%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
"%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
"%d" /*cpu last seen on*/
-#endif
+# endif
,
sp->state, &sp->ppid,
&sp->pgid, &sp->sid, &tty,
@@ -296,17 +298,17 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
&sp->start_time,
&vsz,
&rss
-#if ENABLE_FEATURE_TOP_SMP_PROCESS
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
, &sp->last_seen_on_cpu
-#endif
+# endif
);
if (n < 11)
- break;
-#if ENABLE_FEATURE_TOP_SMP_PROCESS
+ continue; /* bogus data, get next /proc/XXX */
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
if (n < 11+15)
sp->last_seen_on_cpu = 0;
-#endif
+# endif
/* vsz is in bytes and we want kb */
sp->vsz = vsz >> 10;
@@ -336,14 +338,14 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
sp->vsz = fast_strtoul_10(&cp) >> 10;
/* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
-#if ENABLE_FEATURE_TOP_SMP_PROCESS
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
/* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
/* (4): signal, blocked, sigignore, sigcatch */
/* (4): wchan, nswap, cnswap, exit_signal */
cp = skip_fields(cp, 14);
//FIXME: is it safe to assume this field exists?
sp->last_seen_on_cpu = fast_strtoul_10(&cp);
-#endif
+# endif
#endif /* end of !ENABLE_FEATURE_TOP_SMP_PROCESS */
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
@@ -368,48 +370,48 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
strcpy(filename_tail, "smaps");
file = fopen_for_read(filename);
- if (!file)
- break;
- while (fgets(buf, sizeof(buf), file)) {
- unsigned long sz;
- char *tp;
- char w;
+ if (file) {
+ while (fgets(buf, sizeof(buf), file)) {
+ unsigned long sz;
+ char *tp;
+ char w;
#define SCAN(str, name) \
if (strncmp(buf, str, sizeof(str)-1) == 0) { \
tp = skip_whitespace(buf + sizeof(str)-1); \
sp->name += fast_strtoul_10(&tp); \
continue; \
}
- SCAN("Shared_Clean:" , shared_clean );
- SCAN("Shared_Dirty:" , shared_dirty );
- SCAN("Private_Clean:", private_clean);
- SCAN("Private_Dirty:", private_dirty);
+ SCAN("Shared_Clean:" , shared_clean );
+ SCAN("Shared_Dirty:" , shared_dirty );
+ SCAN("Private_Clean:", private_clean);
+ SCAN("Private_Dirty:", private_dirty);
#undef SCAN
- // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
- tp = strchr(buf, '-');
- if (tp) {
- *tp = ' ';
- tp = buf;
- sz = fast_strtoul_16(&tp); /* start */
- sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */
- // tp -> "rw-s" string
- w = tp[1];
- // skipping "rw-s ADR M:m OFS "
- tp = skip_whitespace(skip_fields(tp, 4));
- // filter out /dev/something (something != zero)
- if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
- if (w == 'w') {
- sp->mapped_rw += sz;
- } else if (w == '-') {
- sp->mapped_ro += sz;
+ // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
+ tp = strchr(buf, '-');
+ if (tp) {
+ *tp = ' ';
+ tp = buf;
+ sz = fast_strtoul_16(&tp); /* start */
+ sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */
+ // tp -> "rw-s" string
+ w = tp[1];
+ // skipping "rw-s ADR M:m OFS "
+ tp = skip_whitespace(skip_fields(tp, 4));
+ // filter out /dev/something (something != zero)
+ if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
+ if (w == 'w') {
+ sp->mapped_rw += sz;
+ } else if (w == '-') {
+ sp->mapped_ro += sz;
+ }
}
- }
//else printf("DROPPING %s (%s)\n", buf, tp);
- if (strcmp(tp, "[stack]\n") == 0)
- sp->stack += sz;
+ if (strcmp(tp, "[stack]\n") == 0)
+ sp->stack += sz;
+ }
}
+ fclose(file);
}
- fclose(file);
}
#endif /* TOPMEM */
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
@@ -418,23 +420,34 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
strcpy(filename_tail, "status");
file = fopen_for_read(filename);
- if (!file)
- break;
- while (fgets(buf, sizeof(buf), file)) {
- char *tp;
+ if (file) {
+ while (fgets(buf, sizeof(buf), file)) {
+ char *tp;
#define SCAN_TWO(str, name, statement) \
if (strncmp(buf, str, sizeof(str)-1) == 0) { \
tp = skip_whitespace(buf + sizeof(str)-1); \
sscanf(tp, "%u", &sp->name); \
statement; \
}
- SCAN_TWO("Uid:", ruid, continue);
- SCAN_TWO("Gid:", rgid, break);
+ SCAN_TWO("Uid:", ruid, continue);
+ SCAN_TWO("Gid:", rgid, break);
#undef SCAN_TWO
+ }
+ fclose(file);
}
- fclose(file);
}
#endif /* PS_ADDITIONAL_COLUMNS */
+ if (flags & PSSCAN_EXE) {
+ strcpy(filename_tail, "exe");
+ free(sp->exe);
+ sp->exe = xmalloc_readlink(filename);
+ }
+ /* Note: if /proc/PID/cmdline is empty,
+ * code below "breaks". Therefore it must be
+ * the last code to parse /proc/PID/xxx data
+ * (we used to have /proc/PID/exe parsing after it
+ * and were getting stale sp->exe).
+ */
#if 0 /* PSSCAN_CMD is not used */
if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
free(sp->argv0);
@@ -477,13 +490,9 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
}
}
#endif
- if (flags & PSSCAN_EXE) {
- strcpy(filename_tail, "exe");
- free(sp->exe);
- sp->exe = xmalloc_readlink(filename);
- }
break;
- }
+ } /* for (;;) */
+
return sp;
}
generated by cgit v1.1 at 2024-12-30 20:42:19 +0000