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