10 Nov
2016
10 Nov
'16
1:27 a.m.
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- Log -----------------------------------------------------------------
commit a9a2380cf01cdae519fdaf8ab021d486c8917e43
Author: Waldemar Brodkorb <wbx(a)uclibc-ng.org>
Date: Thu Nov 10 02:26:09 2016 +0100
nptl: add pthread_getname_np/pthread_setname_np from GNU libc
These functions are used by firefox for example.
Tested with running firefox on x86 system.
-----------------------------------------------------------------------
Summary of changes:
libc/sysdeps/linux/common/not-cancel.h | 2 +-
libpthread/nptl/pthread_getname.c | 69 +++++++++++++++++++++++++++++++
libpthread/nptl/pthread_setname.c | 63 ++++++++++++++++++++++++++++
libpthread/nptl/sysdeps/pthread/pthread.h | 10 +++++
4 files changed, 143 insertions(+), 1 deletion(-)
create mode 100644 libpthread/nptl/pthread_getname.c
create mode 100644 libpthread/nptl/pthread_setname.c
diff --git a/libc/sysdeps/linux/common/not-cancel.h
b/libc/sysdeps/linux/common/not-cancel.h
index 08c544b..9d15884 100644
--- a/libc/sysdeps/linux/common/not-cancel.h
+++ b/libc/sysdeps/linux/common/not-cancel.h
@@ -70,7 +70,7 @@ extern int __openat64_nocancel (int fd, const char *fname, int oflag,
#define read_not_cancel(fd, buf, n) \
INLINE_SYSCALL (read, 3, (fd), (buf), (n))
-#ifdef __UCLIBC_HAS_LINUXTHREADS__
+#ifdef __UCLIBC_HAS_THREADS__
/* Uncancelable write. */
#define write_not_cancel(fd, buf, n) \
INLINE_SYSCALL (write, 3, (fd), (buf), (n))
diff --git a/libpthread/nptl/pthread_getname.c b/libpthread/nptl/pthread_getname.c
new file mode 100644
index 0000000..862c8c7
--- /dev/null
+++ b/libpthread/nptl/pthread_getname.c
@@ -0,0 +1,69 @@
+/* pthread_getname_np -- Get thread name. Linux version
+ Copyright (C) 2010-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthreadP.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include <not-cancel.h>
+
+
+int
+pthread_getname_np (pthread_t th, char *buf, size_t len)
+{
+ const struct pthread *pd = (const struct pthread *) th;
+
+ /* Unfortunately the kernel headers do not export the TASK_COMM_LEN
+ macro. So we have to define it here. */
+#define TASK_COMM_LEN 16
+ if (len < TASK_COMM_LEN)
+ return ERANGE;
+
+ if (pd == THREAD_SELF)
+ return prctl (PR_GET_NAME, buf) ? errno : 0;
+
+#define FMT "/proc/self/task/%u/comm"
+ char fname[sizeof (FMT) + 8];
+ sprintf (fname, FMT, (unsigned int) pd->tid);
+
+ int fd = open_not_cancel_2 (fname, O_RDONLY);
+ if (fd == -1)
+ return errno;
+
+ int res = 0;
+ ssize_t n = TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, len));
+ if (n < 0)
+ res = errno;
+ else
+ {
+ if (buf[n - 1] == '\n')
+ buf[n - 1] = '\0';
+ else if (n == len)
+ res = ERANGE;
+ else
+ buf[n] = '\0';
+ }
+
+ close_not_cancel_no_status (fd);
+
+ return res;
+}
diff --git a/libpthread/nptl/pthread_setname.c b/libpthread/nptl/pthread_setname.c
new file mode 100644
index 0000000..6c5e1d6
--- /dev/null
+++ b/libpthread/nptl/pthread_setname.c
@@ -0,0 +1,63 @@
+/* pthread_setname_np -- Set thread name. Linux version
+ Copyright (C) 2010-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthreadP.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include <not-cancel.h>
+
+
+int
+pthread_setname_np (pthread_t th, const char *name)
+{
+ const struct pthread *pd = (const struct pthread *) th;
+
+ /* Unfortunately the kernel headers do not export the TASK_COMM_LEN
+ macro. So we have to define it here. */
+#define TASK_COMM_LEN 16
+ size_t name_len = strlen (name);
+ if (name_len >= TASK_COMM_LEN)
+ return ERANGE;
+
+ if (pd == THREAD_SELF)
+ return prctl (PR_SET_NAME, name) ? errno : 0;
+
+#define FMT "/proc/self/task/%u/comm"
+ char fname[sizeof (FMT) + 8];
+ sprintf (fname, FMT, (unsigned int) pd->tid);
+
+ int fd = open_not_cancel_2 (fname, O_RDWR);
+ if (fd == -1)
+ return errno;
+
+ int res = 0;
+ ssize_t n = TEMP_FAILURE_RETRY (write_not_cancel (fd, name, name_len));
+ if (n < 0)
+ res = errno;
+ else if (n != name_len)
+ res = EIO;
+
+ close_not_cancel_no_status (fd);
+
+ return res;
+}
diff --git a/libpthread/nptl/sysdeps/pthread/pthread.h
b/libpthread/nptl/sysdeps/pthread/pthread.h
index 4103a06..b2897b3 100644
--- a/libpthread/nptl/sysdeps/pthread/pthread.h
+++ b/libpthread/nptl/sysdeps/pthread/pthread.h
@@ -428,6 +428,16 @@ extern int pthread_getschedparam (pthread_t __target_thread,
extern int pthread_setschedprio (pthread_t __target_thread, int __prio)
__THROW;
+#ifdef __USE_GNU
+/* Get thread name visible in the kernel and its interfaces. */
+extern int pthread_getname_np (pthread_t __target_thread, char *__buf,
+ size_t __buflen)
+ __THROW __nonnull ((2));
+
+/* Set thread name visible in the kernel and its interfaces. */
+extern int pthread_setname_np (pthread_t __target_thread, const char *__name)
+ __THROW __nonnull ((2));
+#endif
#if defined __USE_UNIX98 && defined __UCLIBC_SUSV4_LEGACY__
/* Determine level of concurrency. */
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