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usr/apps/test_process.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/cervus.h>
+
+static int failed = 0;
+static void ok(const char *s)   { printf("  [OK]  %s\n", s); }
+static void fail(const char *s) { printf("  [FAIL] %s\n", s); failed = 1; }
+
+int main(int argc, char **argv)
+{
+    (void)argc; (void)argv;
+    puts("--- test_process ---");
+
+    pid_t my_pid = getpid();
+    if (my_pid > 0) ok("getpid > 0"); else fail("getpid > 0");
+
+    pid_t my_ppid = getppid();
+    if (my_ppid > 0) ok("getppid > 0"); else fail("getppid > 0");
+
+    pid_t child = fork();
+    if (child < 0) { fail("fork"); return 1; }
+
+    if (child == 0) {
+        if (getppid() == my_pid) ok("child: ppid == parent pid");
+        else fail("child: ppid == parent pid");
+        return 42;
+    }
+
+    int status = 0;
+    pid_t reaped = waitpid(child, &status, 0);
+    if (reaped == child)           ok("waitpid returns child pid");
+    else                           fail("waitpid returns child pid");
+    if (WIFEXITED(status))         ok("WIFEXITED");
+    else                           fail("WIFEXITED");
+    if (WEXITSTATUS(status) == 42) ok("exit code 42");
+    else { printf("  exit code = %d\n", WEXITSTATUS(status)); fail("exit code 42"); }
+
+    pid_t r = waitpid(-1, &status, WNOHANG);
+    if (r == 0) ok("WNOHANG returns 0 when no zombie");
+    else fail("WNOHANG returns 0 when no zombie");
+
+    if (getuid() == 0) ok("getuid == 0 (root)");
+    else fail("getuid == 0");
+
+    puts("--- test_process done ---");
+    return failed ? 1 : 0;
+}