Initial escape library

Not working yet

darkwater/Util.cpp

@@ -0,0 +1,70 @@
+#include <cstdio>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "Util.h"
+
+#define SCRIPT_PATH "../../../check_apm.sh"
+
+int write_file(const char *path, const char *fmt, ...)
+{
+    errno = 0;
+
+    int fd = ::open(path, O_WRONLY | O_CLOEXEC);
+    if (fd == -1) {
+        return -errno;
+    }
+
+    va_list args;
+    va_start(args, fmt);
+
+    int ret = ::vdprintf(fd, fmt, args);
+    int errno_bkp = errno;
+    ::close(fd);
+
+    va_end(args);
+
+    if (ret < 1) {
+        return -errno_bkp;
+    }
+
+    return ret;
+}
+
+int read_file(const char *path, const char *fmt, ...)
+{
+    errno = 0;
+
+    FILE *file = ::fopen(path, "re");
+    if (!file)
+        return -errno;
+
+    va_list args;
+    va_start(args, fmt);
+
+    int ret = ::vfscanf(file, fmt, args);
+    int errno_bkp = errno;
+    ::fclose(file);
+
+    va_end(args);
+
+    if (ret < 1)
+        return -errno_bkp;
+
+    return ret;
+}
+
+bool check_apm()
+{
+    int ret =  system("ps -AT | grep -c sched-timer > /dev/null");
+
+    if (WEXITSTATUS(ret) <= 0) {
+        fprintf(stderr, "APM is running. Can't launch the example\n");
+        return true;
+    }
+
+    return false;
+}