diff mbox series

[v3,2/7] libltpswap: alter tst_count_swaps api

Message ID 20240208100517.1974-2-xuyang2018.jy@fujitsu.com
State Superseded
Headers show
Series [v3,1/7] libltpswap: Add tst_max_swapfiles api | expand

Commit Message

Yang Xu Feb. 8, 2024, 10:05 a.m. UTC 
Like we count the ipc resource total, we can also add a
similar api for swapfiles, so we can use it for swapon03 case.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 include/libswap.h         |  5 +++++
 libs/libltpswap/libswap.c | 27 +++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
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Patch

diff --git a/include/libswap.h b/include/libswap.h
index 361d73175..76a3ed0c0 100644
--- a/include/libswap.h
+++ b/include/libswap.h
@@ -27,4 +27,9 @@  bool is_swap_supported(const char *filename);
  */
 int tst_max_swapfiles(void);
 
+/*
+ * Get the used swapfiles number
+ */
+int tst_count_swaps(void);
+
 #endif /* __LIBSWAP_H__ */
diff --git a/libs/libltpswap/libswap.c b/libs/libltpswap/libswap.c
index 69273fb33..fa0d42543 100644
--- a/libs/libltpswap/libswap.c
+++ b/libs/libltpswap/libswap.c
@@ -261,3 +261,30 @@  int tst_max_swapfiles(void)
 
 	return max_swapfile - swp_migration_num - swp_hwpoison_num - swp_device_num - swp_pte_marker_num;
 }
+
+/*
+ * Get the used swapfiles number
+ */
+int tst_count_swaps(void)
+{
+	FILE *fp;
+	int used = -1;
+	char c;
+
+	fp = fopen("/proc/swaps", "r");
+	if (fp == NULL) {
+		return -1;
+	}
+
+	while ((c = fgetc(fp)) != EOF) {
+		if (c == '\n')
+			used++;
+	}
+
+	fclose(fp);
+	if (used < 0) {
+		tst_brk(TBROK, "can't read /proc/swaps to get used swapfiles resource total ");
+	}
+
+	return used;
+}