diff options
Diffstat (limited to 'nptl/pthread_setname.c')
| -rw-r--r-- | nptl/pthread_setname.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/nptl/pthread_setname.c b/nptl/pthread_setname.c index adfb3e828f..29df46b77c 100644 --- a/nptl/pthread_setname.c +++ b/nptl/pthread_setname.c @@ -1,5 +1,5 @@ -/* pthread_setname_np -- Set thread name. Stub version. - Copyright (C) 2014-2020 Free Software Foundation, Inc. +/* pthread_setname_np -- Set thread name. Linux version + Copyright (C) 2010-2020 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 @@ -17,16 +17,47 @@ not, see <https://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; - if (INVALID_TD_P (pd)) - return ESRCH; + /* 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 = __open64_nocancel (fname, O_RDWR); + if (fd == -1) + return errno; + + int res = 0; + ssize_t n = TEMP_FAILURE_RETRY (__write_nocancel (fd, name, name_len)); + if (n < 0) + res = errno; + else if (n != name_len) + res = EIO; + + __close_nocancel_nostatus (fd); - return ENOSYS; + return res; } -stub_warning (pthread_setname_np) |