Merge pull request #25 from jodizzle/dev/swap

Add functions for measuring swap

README.md

@@ -19,6 +19,7 @@ The following information is included:
 - IP addresses
 - Load averages
 - Memory status (free memory, percentage, total memory and used memory)
+- Swap status (free swap, percentage, total swap and used swap)
 - Temperature
 - Uptime
 - Volume percentage (ALSA)

config.def.h

@@ -11,21 +11,25 @@
 - battery_state (battery charging state) [argument: battery name]
 - cpu_perc (cpu usage in percent) [argument: NULL]
 - datetime (date and time) [argument: format]
-- disk_free (disk usage in percent) [argument: mountpoint]
+- disk_free (free disk space in GB) [argument: mountpoint]
 - disk_perc (disk usage in percent) [argument: mountpoint]
-- disk_total (disk usage in percent) [argument: mountpoint]
+- disk_total (total disk space in GB) [argument: mountpoint]
-- disk_used (disk usage in percent) [argument: mountpoint]
+- disk_used (used disk space in GB) [argument: mountpoint]
 - entropy (available entropy) [argument: NULL]
 - gid (gid of current user) [argument: NULL]
 - hostname [argument: NULL]
 - ip (ip address) [argument: interface]
 - load_avg (load average) [argument: NULL]
-- ram_free (ram usage in percent) [argument: NULL]
+- ram_free (free ram in GB) [argument: NULL]
 - ram_perc (ram usage in percent) [argument: NULL]
-- ram_total (ram usage in percent) [argument: NULL]
+- ram_total (total ram in GB) [argument: NULL]
-- ram_used (ram usage in percent) [argument: NULL]
+- ram_used (used ram in GB) [argument: NULL]
 - run_command (run custom shell command) [argument: command]
-- temp (temperature in degrees) [argument: temperature file]
+- swap_free (free swap in GB) [argument: NULL]
+- swap_perc (swap usage in percent) [argument: NULL]
+- swap_total (total swap in GB) [argument: NULL]
+- swap_used (used swap in GB) [argument: NULL]
+- temp (temperature in celsius) [argument: temperature file]
 - uid (uid of current user) [argument: NULL]
 - uptime (uptime) [argument: NULL]
 - username (username of current user) [argument: NULL]

slstatus.c

@@ -57,6 +57,10 @@ static char *ram_perc(void);
 static char *ram_used(void);
 static char *ram_total(void);
 static char *run_command(const char *cmd);
+static char *swap_free(void);
+static char *swap_perc(void);
+static char *swap_used(void);
+static char *swap_total(void);
 static char *temp(const char *file);
 static char *uid(void);
 static char *uptime(void);
@@ -417,6 +421,145 @@ run_command(const char *cmd)
 	return smprintf("%s", buf);
 }
 
+static char *
+swap_free(void)
+{
+	long total, free;
+	FILE *fp;
+	char buf[2048];
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return smprintf(UNKNOWN_STR);
+	}
+	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	buf[bytes_read] = '\0';
+	fclose(fp);
+	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+		warn("Failed to read /proc/meminfo\n");
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapTotal");
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+	if (total == 0) {
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapFree");
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return smprintf("%f", (float)free / 1024 / 1024);
+}
+
+static char *
+swap_perc(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	char buf[2048];
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return smprintf(UNKNOWN_STR);
+	}
+	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	buf[bytes_read] = '\0';
+	fclose(fp);
+	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+		warn("Failed to read /proc/meminfo\n");
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapTotal");
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+	if (total == 0) {
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapCached");
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	match = strstr(buf, "SwapFree");
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return smprintf("%d%%", 100 * (total - free - cached) / total);
+}
+
+static char *
+swap_total(void)
+{
+	long total;
+	FILE *fp;
+	char buf[2048];
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return smprintf(UNKNOWN_STR);
+	}
+	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	buf[bytes_read] = '\0';
+	fclose(fp);
+	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+		warn("Failed to read /proc/meminfo\n");
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapTotal");
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+	if (total == 0) {
+		return smprintf(UNKNOWN_STR);
+	}
+
+	return smprintf("%f", (float)total / 1024 / 1024);
+}
+
+static char *
+swap_used(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	char buf[2048];
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return smprintf(UNKNOWN_STR);
+	}
+	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	buf[bytes_read] = '\0';
+	fclose(fp);
+	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+		warn("Failed to read /proc/meminfo\n");
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapTotal");
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+	if (total == 0) {
+		return smprintf(UNKNOWN_STR);
+	}
+
+	match = strstr(buf, "SwapCached");
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	match = strstr(buf, "SwapFree");
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
+}
+
 static char *
 temp(const char *file)
 {