98 lines
2.6 KiB
Diff
98 lines
2.6 KiB
Diff
|
commit f988b7f228851370d1faa1e8f28d02f4b4e6dc46
|
||
|
|
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
|
||
|
|
Date: Thu Nov 25 09:12:00 2021 -0300
|
||
|
|
|
||
|
|
linux: Use /proc/stat fallback for __get_nprocs_conf (BZ #28624)
|
||
|
|
|
||
|
|
The /proc/statm fallback was removed by f13fb81ad3159 if sysfs is
|
||
|
|
not available, reinstate it.
|
||
|
|
|
||
|
|
Checked on x86_64-linux-gnu.
|
||
|
|
(cherry-picked from commit 137ed5ac440a4d3cf4178ce97f349b349a9c2c66)
|
||
|
|
|
||
|
|
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
|
||
|
|
index d70ed9586950615c..7fc6521942e87293 100644
|
||
|
|
--- a/sysdeps/unix/sysv/linux/getsysstats.c
|
||
|
|
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
|
||
|
|
@@ -108,6 +108,37 @@ next_line (int fd, char *const buffer, char **cp, char **re,
|
||
|
|
return res == *re ? NULL : res;
|
||
|
|
}
|
||
|
|
|
||
|
|
+static int
|
||
|
|
+get_nproc_stat (char *buffer, size_t buffer_size)
|
||
|
|
+{
|
||
|
|
+ char *buffer_end = buffer + buffer_size;
|
||
|
|
+ char *cp = buffer_end;
|
||
|
|
+ char *re = buffer_end;
|
||
|
|
+
|
||
|
|
+ /* Default to an SMP system in case we cannot obtain an accurate
|
||
|
|
+ number. */
|
||
|
|
+ int result = 2;
|
||
|
|
+
|
||
|
|
+ const int flags = O_RDONLY | O_CLOEXEC;
|
||
|
|
+ int fd = __open_nocancel ("/proc/stat", flags);
|
||
|
|
+ if (fd != -1)
|
||
|
|
+ {
|
||
|
|
+ result = 0;
|
||
|
|
+
|
||
|
|
+ char *l;
|
||
|
|
+ while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
|
||
|
|
+ /* The current format of /proc/stat has all the cpu* entries
|
||
|
|
+ at the front. We assume here that stays this way. */
|
||
|
|
+ if (strncmp (l, "cpu", 3) != 0)
|
||
|
|
+ break;
|
||
|
|
+ else if (isdigit (l[3]))
|
||
|
|
+ ++result;
|
||
|
|
+
|
||
|
|
+ __close_nocancel_nostatus (fd);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ return result;
|
||
|
|
+}
|
||
|
|
|
||
|
|
int
|
||
|
|
__get_nprocs (void)
|
||
|
|
@@ -163,30 +194,7 @@ __get_nprocs (void)
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
- cp = buffer_end;
|
||
|
|
- re = buffer_end;
|
||
|
|
-
|
||
|
|
- /* Default to an SMP system in case we cannot obtain an accurate
|
||
|
|
- number. */
|
||
|
|
- result = 2;
|
||
|
|
-
|
||
|
|
- fd = __open_nocancel ("/proc/stat", flags);
|
||
|
|
- if (fd != -1)
|
||
|
|
- {
|
||
|
|
- result = 0;
|
||
|
|
-
|
||
|
|
- while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
|
||
|
|
- /* The current format of /proc/stat has all the cpu* entries
|
||
|
|
- at the front. We assume here that stays this way. */
|
||
|
|
- if (strncmp (l, "cpu", 3) != 0)
|
||
|
|
- break;
|
||
|
|
- else if (isdigit (l[3]))
|
||
|
|
- ++result;
|
||
|
|
-
|
||
|
|
- __close_nocancel_nostatus (fd);
|
||
|
|
- }
|
||
|
|
-
|
||
|
|
- return result;
|
||
|
|
+ return get_nproc_stat (buffer, buffer_size);
|
||
|
|
}
|
||
|
|
libc_hidden_def (__get_nprocs)
|
||
|
|
weak_alias (__get_nprocs, get_nprocs)
|
||
|
|
@@ -220,7 +228,9 @@ __get_nprocs_conf (void)
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
- return 1;
|
||
|
|
+ enum { buffer_size = 1024 };
|
||
|
|
+ char buffer[buffer_size];
|
||
|
|
+ return get_nproc_stat (buffer, buffer_size);
|
||
|
|
}
|
||
|
|
libc_hidden_def (__get_nprocs_conf)
|
||
|
|
weak_alias (__get_nprocs_conf, get_nprocs_conf)
|