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97 lines
2.6 KiB
97 lines
2.6 KiB
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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