[Minios-devel] [UNIKRAFT/MUSL PATCH 17/19] Implement functions related to process management with glue code

[Gaulthier Gain <gaulthier.gain@xxxxxxxxx>]

wip: This commit adds functions related to process management in
process.c and are copied from the process file defined in the newlibc
glue code.

Signed-off-by: Gaulthier Gain <gaulthier.gain@xxxxxxxxx>
---
 Makefile.uk          |   1 +
 include/uk/process.h |  43 +++++++++
 process.c            | 242 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 286 insertions(+)
 create mode 100644 include/uk/process.h
 create mode 100644 process.c

diff --git a/Makefile.uk b/Makefile.uk
index 4c65046..e30c3f7 100644
--- a/Makefile.uk
+++ b/Makefile.uk
@@ -135,6 +135,7 @@ LIBMUSLGLUE_CXXFLAGS-y += $(LIBMUSLGLUE_SUPPRESS_FLAGS-y)
 
################################################################################
 LIBMUSLGLUE_SRCS-y += $(LIBMUSL_BASE)/mem.c
 LIBMUSLGLUE_SRCS-y += $(LIBMUSL_BASE)/ldso.c
+LIBMUSLGLUE_SRCS-y += $(LIBMUSL_BASE)/process.c
 LIBMUSLGLUE_SRCS-y += $(LIBMUSL_BASE)/stdio.c
 LIBMUSLGLUE_SRCS-y += $(LIBMUSL_BASE)/thread.c
 
diff --git a/include/uk/process.h b/include/uk/process.h
new file mode 100644
index 0000000..67208e3
--- /dev/null
+++ b/include/uk/process.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Costin Lupu <costin.lupu@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, University Politehnica of Bucharest. All rights 
reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UK_PROCESS_H__
+#define __UK_PROCESS_H__
+
+#define UNIKRAFT_PID      1
+#define UNIKRAFT_PPID     0
+#define UNIKRAFT_SID      0
+#define UNIKRAFT_PGID     0
+
+#endif /* __UK_PROCESS_H__ */
diff --git a/process.c b/process.c
new file mode 100644
index 0000000..ef8de05
--- /dev/null
+++ b/process.c
@@ -0,0 +1,242 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * libnewlib glue code
+ *
+ * Authors: Felipe Huici <felipe.huici@xxxxxxxxx>
+ *          Costin Lupu <costin.lupu@xxxxxxxxx>
+ *          Gaulthier Gain <gaulthier.gain@xxxxxxxxx>
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <spawn.h>
+#include <uk/process.h>
+#include <uk/print.h>
+extern int errno;
+
+int fork(void)
+{
+       /* fork() is not supported on this platform */
+       errno = ENOSYS;
+       return -1;
+}
+
+static
+void exec_warn(const char *func,
+               const char *path, char *const argv[], char *const envp[])
+{
+       int i;
+
+       uk_pr_warn("%s(): path=%s", func, path);
+
+       /* print arguments */
+       i = 0;
+       uk_pr_warn(" argv=[");
+       while (argv[i]) {
+               uk_pr_warn("%s%s", (i > 0 ? ", " : ""), argv[i]);
+               i++;
+       }
+       uk_pr_warn("]");
+
+       /* print environment variables */
+       if (envp) {
+               i = 0;
+               uk_pr_warn(" envp=[");
+               while (envp[i]) {
+                       uk_pr_warn("%s%s", (i > 0 ? ", " : ""), envp[i]);
+                       i++;
+               }
+               uk_pr_warn("]");
+       }
+
+       uk_pr_warn("\n");
+}
+
+int execve(const char *path, char *const argv[], char *const envp[])
+{
+       exec_warn(__func__, path, argv, envp);
+       errno = ENOSYS;
+       return -1;
+}
+
+int execv(const char *path, char *const argv[])
+{
+       exec_warn(__func__, path, argv, NULL);
+       errno = ENOSYS;
+       return -1;
+}
+
+int system(const char *command)
+{
+       uk_pr_warn("%s: %s\n", __func__, command);
+       errno = ENOSYS;
+       return -1;
+}
+
+FILE *popen(const char *command, const char *type __unused)
+{
+       uk_pr_warn("%s: %s\n", __func__, command);
+       errno = ENOSYS;
+       return NULL;
+}
+
+int pclose(FILE *stream __unused)
+{
+       errno = EINVAL;
+       return -1;
+}
+
+int wait(int *status __unused)
+{
+       /* No children */
+       errno = ECHILD;
+       return -1;
+}
+
+pid_t waitpid(pid_t pid __unused, int *wstatus __unused, int options __unused)
+{
+       /* No children */
+       errno = ECHILD;
+       return -1;
+}
+
+pid_t wait3(int *wstatus __unused, int options __unused,
+               struct rusage *rusage __unused)
+{
+       /* No children */
+       errno = ECHILD;
+       return -1;
+}
+
+pid_t wait4(pid_t pid __unused, int *wstatus __unused, int options __unused,
+               struct rusage *rusage __unused)
+{
+       /* No children */
+       errno = ECHILD;
+       return -1;
+}
+
+int getpid(void)
+{
+       return UNIKRAFT_PID;
+}
+
+pid_t getppid(void)
+{
+       return UNIKRAFT_PPID;
+}
+
+pid_t setsid(void)
+{
+       /* We have a single "session" with a single "process" */
+       errno = EPERM;
+       return (pid_t) -1;
+}
+
+pid_t getsid(pid_t pid)
+{
+       if (pid != 0) {
+               /* We support only calls for the only calling "process" */
+               errno = ESRCH;
+               return (pid_t) -1;
+       }
+       return UNIKRAFT_SID;
+}
+
+int setpgid(pid_t pid, pid_t pgid)
+{
+       if (pid != 0) {
+               /* We support only calls for the only calling "process" */
+               errno = ESRCH;
+               return (pid_t) -1;
+       }
+       if (pgid != 0) {
+               /* We have a single "group" with a single "process" */
+               errno = EPERM;
+               return (pid_t) -1;
+       }
+       return 0;
+}
+
+pid_t getpgid(pid_t pid)
+{
+       if (pid != 0) {
+               /* We support only calls for the only calling "process" */
+               errno = ESRCH;
+               return (pid_t) -1;
+       }
+       return UNIKRAFT_PGID;
+}
+
+pid_t getpgrp(void)
+{
+       return UNIKRAFT_PGID;
+}
+
+int setpgrp(void)
+{
+       return setpgid(0, 0);
+}
+
+int tcsetpgrp(int fd __unused, pid_t pgrp)
+{
+       /* TODO check if fd is BADF */
+       if (pgrp != UNIKRAFT_PGID) {
+               errno = EINVAL;
+               return -1;
+       }
+       return 0;
+}
+
+pid_t tcgetpgrp(int fd)
+{
+       /* We have a single "process group" */
+       return UNIKRAFT_PGID;
+}
+
+int nice(int inc __unused)
+{
+       /* We don't support priority updates for unikernels */
+       errno = EPERM;
+       return -1;
+}
+
+int posix_spawn(pid_t *restrict res, const char *restrict path,
+                const posix_spawn_file_actions_t *fa,
+                const posix_spawnattr_t *restrict attr,
+                char *const argv[restrict], char *const envp[restrict])
+{
+        errno = ENOSYS;
+        return -1;
+}
-- 
2.11.0


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