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- Log ----------------------------------------------------------------- commit a9a2380cf01cdae519fdaf8ab021d486c8917e43 Author: Waldemar Brodkorb wbx@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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