utils

commit: ac87ab150f2422b2a5a7ad006690018fddaea576
parent: e130be699a76758f5642efc2659bb6e0c7ebc099
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Wed,  6 May 2020 08:29:55 +0200

sbin/memsys: New

Diffstat:
M
Makefile
3
+++
A
sbin/Makefile
9
+++++++++
A
sbin/Makefile.config
1
+
A
sbin/memsys.c
27
+++++++++++++++++++++++++++

4 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,8 +1,11 @@
 all:
 	cd bin ; $(MAKE)
+	cd sbin ; $(MAKE)
 
 clean:
 	cd bin ; $(MAKE) clean
+	cd sbin ; $(MAKE) clean
 
 install:
 	cd bin ; $(MAKE) install
+	cd sbin ; $(MAKE) install
diff --git a/sbin/Makefile b/sbin/Makefile
@@ -0,0 +1,9 @@
+# POSIX-ish Makefile with extensions common to *BSD and GNU such as:
+# - Usage of backticks for shell evaluation
+# - Usage of ?= for defining variables when not already defined
+# - Usage of += for appending to a variable
+
+include Makefile.config
+include ../Makefile.common
+
+BINDIR = $(PREFIX)/sbin
diff --git a/sbin/Makefile.config b/sbin/Makefile.config
@@ -0,0 +1 @@
+EXE = memsys
diff --git a/sbin/memsys.c b/sbin/memsys.c
@@ -0,0 +1,27 @@
+// Copyright 2020 Haelwenn (lanodan) Monnier <contact@hacktivis.me>
+// Distributed under the terms of the CC-BY-4.0 license
+
+#define _POSIX_C_SOURCE 200809L
+#include <fcntl.h> /* open() */
+#include <unistd.h> /* close(), write() */
+#include <stdio.h> /* perror() */
+
+#define SYS_POWER_STATE "/sys/power/state"
+
+int main(void) {
+	int fd, err = 0;
+	char *entry = "mem";
+	size_t entry_size = 3;
+
+	fd = open(SYS_POWER_STATE, O_WRONLY);
+
+	if(fd == -1) {
+		perror("memsys: open(\""SYS_POWER_STATE"\")");
+		err++;
+	} else {
+		write(fd, &entry, entry_size);
+		close(fd);
+	}
+
+	return 0;
+}