#include "utils.h"
#define MAX_LEN 16
+
+static
+int open_read_close(const char *path)
+{
+ int fd, ret;
+ char buf[MAX_LEN];
+ /*
+ * Start generating syscalls. We use syscall(2) to prevent libc to change
+ * the underlying syscall. e.g. calling openat(2) instead of open(2).
+ */
+ fd = syscall(SYS_openat, AT_FDCWD, path, O_RDONLY);
+ if (fd < 0) {
+ perror("open");
+ ret = -1;
+ goto error;
+ }
+
+ ret = syscall(SYS_read, fd, buf, MAX_LEN);
+ if (ret < 0) {
+ perror("read");
+ ret = -1;
+ goto error;
+ }
+
+ ret = syscall(SYS_close, fd);
+ if (ret == -1) {
+ perror("close");
+ ret = -1;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
/*
* The process waits for the creation of a file passed as argument from an
* external processes to execute a syscall and exiting. This is useful for tests
*/
int main(int argc, char **argv)
{
- int fd, ret;
- char buf[MAX_LEN];
+ int ret;
char *start_file;
if (argc != 2) {
* Start generating syscalls. We use syscall(2) to prevent libc to change
* the underlying syscall. e.g. calling openat(2) instead of open(2).
*/
- fd = syscall(SYS_openat, AT_FDCWD, "/proc/cpuinfo", O_RDONLY);
- if (fd < 0) {
- perror("open");
- ret = -1;
- goto error;
- }
-
- ret = syscall(SYS_read, fd, buf, MAX_LEN);
- if (ret < 0) {
- perror("read");
+ ret = open_read_close("/proc/cpuinfo");
+ if (ret == -1) {
ret = -1;
goto error;
}
- ret = syscall(SYS_close, fd);
+ ret = open_read_close("/proc/cmdline");
if (ret == -1) {
- perror("close");
ret = -1;
goto error;
}