feat(process): fork/exec/id/session + system/popen

src/process/execlp.c

@@ -0,0 +1,47 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdarg.h>
+#include <unistd.h>
+
+#include "../internal/syscall.h"
+
+/*
+ * execlp: like execl, but the file is located through PATH (see
+ * execvp.c). The argv staging uses a VLA; the POSIX signature is fixed
+ * and the adjacent-parameter check is waived per the house NOLINT
+ * convention.
+ */
+// NOLINTBEGIN(bugprone-easily-swappable-parameters)
+int
+execlp(const char *file, const char *arg0, ...)
+{
+    va_list ap;
+    int argc;
+    int i;
+    int ret;
+
+    va_start(ap, arg0);
+    argc = 1;
+    while (va_arg(ap, const char *) != 0)
+    {
+        argc++;
+    }
+    va_end(ap);
+
+    {
+        char *argv[argc + 1];
+
+        argv[0] = (char *)arg0;
+        va_start(ap, arg0);
+        for (i = 1; i <= argc; i++)
+        {
+            argv[i] = va_arg(ap, char *);
+        }
+        va_end(ap);
+        ret = execvp(file, argv);
+    }
+    return ret;
+}
+// NOLINTEND(bugprone-easily-swappable-parameters)