diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-07-31 14:10:50 +0400 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2014-08-04 21:07:11 +0400 |
| commit | 0097875bd41528922fb3bb5f348c53f17e00e2fd (patch) | |
| tree | 414cffac820d04e4542dc7654e7ef188f00ba0b2 /fs/proc/base.c | |
| parent | 6ba8ed79a3cce14bd5597218fd46408b8376f8f3 (diff) | |
| download | linux-0097875bd41528922fb3bb5f348c53f17e00e2fd.tar.xz | |
proc: Implement /proc/thread-self to point at the directory of the current thread
/proc/thread-self is derived from /proc/self. /proc/thread-self
points to the directory in proc containing information about the
current thread.
This funtionality has been missing for a long time, and is tricky to
implement in userspace as gettid() is not exported by glibc. More
importantly this allows fixing defects in /proc/mounts and /proc/net
where in a threaded application today they wind up being empty files
when only the initial pthread has exited, causing problems for other
threads.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index ed34e405c6b9..0131156ce7c9 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2847,7 +2847,7 @@ retry: return iter; } -#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 1) +#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) /* for the /proc/ directory itself, after non-process stuff has been done */ int proc_pid_readdir(struct file *file, struct dir_context *ctx) @@ -2859,14 +2859,19 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx) if (pos >= PID_MAX_LIMIT + TGID_OFFSET) return 0; - if (pos == TGID_OFFSET - 1) { + if (pos == TGID_OFFSET - 2) { struct inode *inode = ns->proc_self->d_inode; if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) return 0; - iter.tgid = 0; - } else { - iter.tgid = pos - TGID_OFFSET; + ctx->pos = pos = pos + 1; + } + if (pos == TGID_OFFSET - 1) { + struct inode *inode = ns->proc_thread_self->d_inode; + if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) + return 0; + ctx->pos = pos = pos + 1; } + iter.tgid = pos - TGID_OFFSET; iter.task = NULL; for (iter = next_tgid(ns, iter); iter.task; |