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authorFelix Janda <felix.janda@posteo.de>2016-09-16 20:54:00 -0400
committerRich Felker <dalias@aerifal.cx>2016-10-20 01:48:27 -0400
commit8fb28b0b3e7a5e958fb844722a4b2ef9bc244af1 (patch)
tree87e0d423b4fffd636fd305667802243a12dd88f7
parent3ca2d2d4aef910663785fe232d7d2127a22d8a84 (diff)
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add pthread_setname_np
the thread name is displayed by gdb's "info threads".
-rw-r--r--include/pthread.h1
-rw-r--r--src/thread/pthread_setname_np.c26
2 files changed, 27 insertions, 0 deletions
diff --git a/include/pthread.h b/include/pthread.h
index 3d2e0c45..94ef919c 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 00000000..82d35e17
--- /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;
+}