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From 3fcbd7978980dc1a29c626b701333e27599e506d Mon Sep 17 00:00:00 2001
From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Date: Wed, 23 Nov 2016 14:13:34 +0900
Subject: [PATCH] lsns: Fix parser for /proc/<pid>/stat which is including
space in comm
For example, child process of spamd has
32031 (spamd child) S 32026 32026 32026 0 -1 4210752 338 0 0 0 ...
fscanf("%d %*s %c %d*[^\n]") in read_process() can't parse above as we
expected, because %s only skips non-whitespace. I.e. it parses like
following,
32031 (spamd child) S 32026 32026 32026 0 -1 4210752 338 0 0 0 ...
+---+ +----+ +
%d %*s %c
and returns 2 (pid=32031, state=c).
This fixes it by skipping task->comm part manually.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
---
sys-utils/lsns.c | 30 ++++++++++++++++++++++++++----
1 file changed, 26 insertions(+), 4 deletions(-)
diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
index e4fd208..809737c 100644
--- a/sys-utils/lsns.c
+++ b/sys-utils/lsns.c
@@ -217,6 +217,30 @@ static int get_ns_ino(int dir, const char *nsname, ino_t *ino)
return 0;
}
+static int parse_proc_stat(FILE *fp, pid_t *pid, char *state, pid_t *ppid)
+{
+ char *line = NULL, *p;
+ size_t len = 0;
+ int rc;
+
+ if (getline(&line, &len, fp) < 0) {
+ rc = -errno;
+ goto error;
+ }
+
+ p = strrchr(line, ')');
+ if (p == NULL ||
+ sscanf(line, "%d (", pid) != 1 ||
+ sscanf(p, ") %c %d*[^\n]", state, ppid) != 2) {
+ rc = -EINVAL;
+ goto error;
+ }
+ rc = 0;
+
+error:
+ free(line);
+ return rc;
+}
static int read_process(struct lsns *ls, pid_t pid)
{
@@ -255,11 +279,9 @@ static int read_process(struct lsns *ls, pid_t pid)
rc = -errno;
goto done;
}
- rc = fscanf(f, "%d %*s %c %d*[^\n]", &p->pid, &p->state, &p->ppid);
- if (rc != 3) {
- rc = rc < 0 ? -errno : -EINVAL;
+ rc = parse_proc_stat(f, &p->pid, &p->state, &p->ppid);
+ if (rc < 0)
goto done;
- }
rc = 0;
for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
--
2.10.2
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