pthread_getname_np implementation

["Poggiali, Antonio" <Antonio.Poggiali@datalogic.com>]

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Hello,

I've written the missing API pthread_getname_np for the latest version of the library.
 In attachment the patch to apply in on the master branch.

I'd really like to see it integrated in the next release.

Regards


Antonio Poggiali
R&D Senior SW Engineer Automation Products

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[-- Attachment #2: 0001-Add-pthread_getname_np-API.patch --]
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From 20cea82579d482b90bd3db956fb0aecde8fd9fc8 Mon Sep 17 00:00:00 2001
From: apoggiali <antonio.poggiali@datalogic.com>
Date: Fri, 21 Jun 2019 14:57:04 +0200
Subject: [PATCH] Add pthread_getname_np API

---
 include/pthread.h               |  1 +
 src/thread/pthread_getname_np.c | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 src/thread/pthread_getname_np.c

diff --git a/include/pthread.h b/include/pthread.h
index e238321b..57fa905c 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -218,6 +218,7 @@ 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_getname_np(pthread_t, char *, size_t);
 int pthread_getattr_default_np(pthread_attr_t *);
 int pthread_setattr_default_np(const pthread_attr_t *);
 int pthread_tryjoin_np(pthread_t, void **);
diff --git a/src/thread/pthread_getname_np.c b/src/thread/pthread_getname_np.c
new file mode 100644
index 00000000..3b5584ca
--- /dev/null
+++ b/src/thread/pthread_getname_np.c
@@ -0,0 +1,27 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "pthread_impl.h"
+
+int pthread_getname_np(pthread_t thread, char *name, size_t len)
+{
+	int fd, cs, status = 0;
+	ssize_t nlen;
+	char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
+
+	if (len < 16) return ERANGE;
+
+	if (thread == pthread_self())
+		return prctl(PR_GET_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_RDONLY)) < 0 || (nlen =read(fd, name, len)) < 0) status = errno;
+	if (fd >= 0) close(fd);
+	pthread_setcancelstate(cs, 0);
+    name[nlen-1] = '\0';	
+	return status;
+}
-- 
2.19.1