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| author | Stephen Smalley <sds@tycho.nsa.gov> | 2015-07-13 09:00:40 -0400 |
|---|---|---|
| committer | Stephen Smalley <sds@tycho.nsa.gov> | 2015-07-13 09:13:00 -0400 |
| commit | 3430519109c0423a49b9350aa8444beec798d5a7 (patch) | |
| tree | 3560cb32ac210f1a9ceb6c8631654c8c78faaa14 /libselinux/src/procattr.c | |
| parent | 0079008a54b18f2599d199bba03502ceede7d694 (diff) | |
| download | android_external_selinux-3430519109c0423a49b9350aa8444beec798d5a7.tar.gz android_external_selinux-3430519109c0423a49b9350aa8444beec798d5a7.tar.bz2 android_external_selinux-3430519109c0423a49b9350aa8444beec798d5a7.zip | |
libselinux: use /proc/thread-self when available
Linux 3.17 introduced a /proc/thread-self symlink that can be used
to reference the proc files of the current thread without needing to
use gettid(2). Use this symlink when it exists, falling back to
using gettid(2) when it does not. This is generally beneficial, but
was specifically motivated by https://github.com/systemd/systemd/issues/475.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Diffstat (limited to 'libselinux/src/procattr.c')
| -rw-r--r-- | libselinux/src/procattr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libselinux/src/procattr.c b/libselinux/src/procattr.c index f9903505..e444571c 100644 --- a/libselinux/src/procattr.c +++ b/libselinux/src/procattr.c @@ -95,6 +95,12 @@ static int openattr(pid_t pid, const char *attr, int flags) if (pid > 0) rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr); else { + rc = asprintf(&path, "/proc/thread-self/attr/%s", attr); + if (rc < 0) + return -1; + fd = open(path, flags | O_CLOEXEC); + if (fd >= 0 || errno != ENOENT) + goto out; if (!tid) tid = gettid(); rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); @@ -103,6 +109,7 @@ static int openattr(pid_t pid, const char *attr, int flags) return -1; fd = open(path, flags | O_CLOEXEC); +out: free(path); return fd; } |