diff options
Diffstat (limited to 'nptl/pthread_getname.c')
| -rw-r--r-- | nptl/pthread_getname.c | 49 |
1 files changed, 43 insertions, 6 deletions
diff --git a/nptl/pthread_getname.c b/nptl/pthread_getname.c index b771f2ef76..c78cccffd4 100644 --- a/nptl/pthread_getname.c +++ b/nptl/pthread_getname.c @@ -1,5 +1,5 @@ -/* pthread_getname_np -- Get thread name. Stub version. - Copyright (C) 2014-2020 Free Software Foundation, Inc. +/* pthread_getname_np -- Get 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 +17,53 @@ 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_getname_np (pthread_t th, char *buf, size_t len) { 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 + 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 = __open64_nocancel (fname, O_RDONLY); + if (fd == -1) + return errno; + + int res = 0; + ssize_t n = TEMP_FAILURE_RETRY (__read_nocancel (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_nocancel_nostatus (fd); - return ENOSYS; + return res; } -stub_warning (pthread_getname_np) |