toolchain/musl/patches/050-add-pthread_setname_np.patch

   1 From 8fb28b0b3e7a5e958fb844722a4b2ef9bc244af1 Mon Sep 17 00:00:00 2001
   2 From: Felix Janda <felix.janda@posteo.de>
   3 Date: Fri, 16 Sep 2016 20:54:00 -0400
   4 Subject: add pthread_setname_np
   5
   6 the thread name is displayed by gdb's "info threads".
   7 ---
   8  include/pthread.h               |  1 +
   9  src/thread/pthread_setname_np.c | 26 ++++++++++++++++++++++++++
  10  2 files changed, 27 insertions(+)
  11  create mode 100644 src/thread/pthread_setname_np.c
  12
  13 diff --git a/include/pthread.h b/include/pthread.h
  14 index 3d2e0c4..94ef919 100644
  15 --- a/include/pthread.h
  16 +++ b/include/pthread.h
  17 @@ -214,6 +214,7 @@ struct cpu_set_t;
  18  int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
  19  int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
  20  int pthread_getattr_np(pthread_t, pthread_attr_t *);
  21 +int pthread_setname_np(pthread_t, const char *);
  22  int pthread_tryjoin_np(pthread_t, void **);
  23  int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
  24  #endif
  25 diff --git a/src/thread/pthread_setname_np.c b/src/thread/pthread_setname_np.c
  26 new file mode 100644
  27 index 0000000..82d35e1
  28 --- /dev/null
  29 +++ b/src/thread/pthread_setname_np.c
  30 @@ -0,0 +1,26 @@
  31 +#define _GNU_SOURCE
  32 +#include <fcntl.h>
  33 +#include <string.h>
  34 +#include <unistd.h>
  35 +#include <sys/prctl.h>
  36 +
  37 +#include "pthread_impl.h"
  38 +
  39 +int pthread_setname_np(pthread_t thread, const char *name)
  40 +{
  41 +       int fd, cs, status = 0;
  42 +       char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
  43 +       size_t len;
  44 +
  45 +       if ((len = strnlen(name, 16)) > 15) return ERANGE;
  46 +
  47 +       if (thread == pthread_self())
  48 +               return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
  49 +
  50 +       snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
  51 +       pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
  52 +       if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
  53 +       if (fd >= 0) close(fd);
  54 +       pthread_setcancelstate(cs, 0);
  55 +       return status;
  56 +}
  57 --
  58 cgit v0.11.2