From: Felix Janda <felix.janda@posteo.de>
To: musl@lists.openwall.com
Subject: [PATCH v2] add pthread_setname_np
Date: Fri, 16 Sep 2016 20:54:00 -0400 [thread overview]
Message-ID: <20160917005400.GA475@nyan> (raw)
the thread name is displayed by gdb's "info threads".
---
v1->v2: add _GNU_SOURCE, and "UL" to prctl arguments
I hope that there are no programs for which this function is
performance critical...
Thanks for the review so far!
---
include/pthread.h | 1 +
src/thread/pthread_setname_np.c | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+)
create mode 100644 src/thread/pthread_setname_np.c
diff --git a/include/pthread.h b/include/pthread.h
index 3d2e0c4..94ef919 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -214,6 +214,7 @@ struct cpu_set_t;
int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
int pthread_getattr_np(pthread_t, pthread_attr_t *);
+int pthread_setname_np(pthread_t, const char *);
int pthread_tryjoin_np(pthread_t, void **);
int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
#endif
diff --git a/src/thread/pthread_setname_np.c b/src/thread/pthread_setname_np.c
new file mode 100644
index 0000000..82d35e1
--- /dev/null
+++ b/src/thread/pthread_setname_np.c
@@ -0,0 +1,26 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "pthread_impl.h"
+
+int pthread_setname_np(pthread_t thread, const char *name)
+{
+ int fd, cs, status = 0;
+ char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
+ size_t len;
+
+ if ((len = strnlen(name, 16)) > 15) return ERANGE;
+
+ if (thread == pthread_self())
+ return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
+
+ snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+ if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
+ if (fd >= 0) close(fd);
+ pthread_setcancelstate(cs, 0);
+ return status;
+}
--
2.7.3
next reply other threads:[~2016-09-17 0:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-17 0:54 Felix Janda [this message]
2016-09-17 2:36 ` Rich Felker
2016-10-20 5:49 ` Rich Felker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160917005400.GA475@nyan \
--to=felix.janda@posteo.de \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).