Add The Linux Programming Interface under examples

https://man7.org/tlpi/index.html

Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>

examples/tlpi/.gitignore

@@ -0,0 +1 @@
+/tlpi

examples/tlpi/0001-add-ename.c.inc.patch

@@ -0,0 +1,57 @@
+From 57d210aa51e9706c3e21156d873bf356527be8c7 Mon Sep 17 00:00:00 2001
+From: chenzhijia <chenzhijia@xiaomi.com>
+Date: Tue, 19 Mar 2024 11:26:27 +0800
+Subject: [PATCH] Linux case base:add ename.c.inc
+
+add source code ename.c.inc
+
+Change-Id: Ie31e2ac3908ce46cfb22102d8cc18fa1b961deb4
+Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>
+---
+
+diff --git a/lib/ename.c.inc b/lib/ename.c.inc
+new file mode 100644
+index 0000000..42642e1
+--- /dev/null
++++ b/lib/ename.c.inc
+@@ -0,0 +1,39 @@
++/* ename.c.inc
++
++   Built on GNU/Linux x86_64 with glibc 2.38
++*/
++static char *ename[] = {
++    /*   0 */ "",
++    /*   1 */ "EPERM", "ENOENT", "ESRCH", "EINTR", "EIO", "ENXIO",
++    /*   7 */ "E2BIG", "ENOEXEC", "EBADF", "ECHILD",
++    /*  11 */ "EAGAIN/EWOULDBLOCK", "ENOMEM", "EACCES", "EFAULT",
++    /*  15 */ "ENOTBLK", "EBUSY", "EEXIST", "EXDEV", "ENODEV",
++    /*  20 */ "ENOTDIR", "EISDIR", "EINVAL", "ENFILE", "EMFILE",
++    /*  25 */ "ENOTTY", "ETXTBSY", "EFBIG", "ENOSPC", "ESPIPE",
++    /*  30 */ "EROFS", "EMLINK", "EPIPE", "EDOM", "ERANGE",
++    /*  35 */ "EDEADLK/EDEADLOCK", "ENAMETOOLONG", "ENOLCK", "ENOSYS",
++    /*  39 */ "ENOTEMPTY", "ELOOP", "", "ENOMSG", "EIDRM", "ECHRNG",
++    /*  45 */ "EL2NSYNC", "EL3HLT", "EL3RST", "ELNRNG", "EUNATCH",
++    /*  50 */ "ENOCSI", "EL2HLT", "EBADE", "EBADR", "EXFULL", "ENOANO",
++    /*  56 */ "EBADRQC", "EBADSLT", "", "EBFONT", "ENOSTR", "ENODATA",
++    /*  62 */ "ETIME", "ENOSR", "ENONET", "ENOPKG", "EREMOTE",
++    /*  67 */ "ENOLINK", "EADV", "ESRMNT", "ECOMM", "EPROTO",
++    /*  72 */ "EMULTIHOP", "EDOTDOT", "EBADMSG", "EOVERFLOW",
++    /*  76 */ "ENOTUNIQ", "EBADFD", "EREMCHG", "ELIBACC", "ELIBBAD",
++    /*  81 */ "ELIBSCN", "ELIBMAX", "ELIBEXEC", "EILSEQ", "ERESTART",
++    /*  86 */ "ESTRPIPE", "EUSERS", "ENOTSOCK", "EDESTADDRREQ",
++    /*  90 */ "EMSGSIZE", "EPROTOTYPE", "ENOPROTOOPT",
++    /*  93 */ "EPROTONOSUPPORT", "ESOCKTNOSUPPORT",
++    /*  95 */ "EOPNOTSUPP/ENOTSUP", "EPFNOSUPPORT", "EAFNOSUPPORT",
++    /*  98 */ "EADDRINUSE", "EADDRNOTAVAIL", "ENETDOWN", "ENETUNREACH",
++    /* 102 */ "ENETRESET", "ECONNABORTED", "ECONNRESET", "ENOBUFS",
++    /* 106 */ "EISCONN", "ENOTCONN", "ESHUTDOWN", "ETOOMANYREFS",
++    /* 110 */ "ETIMEDOUT", "ECONNREFUSED", "EHOSTDOWN", "EHOSTUNREACH",
++    /* 114 */ "EALREADY", "EINPROGRESS", "ESTALE", "EUCLEAN",
++    /* 118 */ "ENOTNAM", "ENAVAIL", "EISNAM", "EREMOTEIO", "EDQUOT",
++    /* 123 */ "ENOMEDIUM", "EMEDIUMTYPE", "ECANCELED", "ENOKEY",
++    /* 127 */ "EKEYEXPIRED", "EKEYREVOKED", "EKEYREJECTED",
++    /* 130 */ "EOWNERDEAD", "ENOTRECOVERABLE", "ERFKILL", "EHWPOISON"
++};
++
++#define MAX_ENAME 133
+\ No newline at end of file

examples/tlpi/0002-fix-setenv-compilation-error.patch

@@ -0,0 +1,111 @@
+From f1154cd6558b99aa5827ac98b20a20753dabd865 Mon Sep 17 00:00:00 2001
+From: chenzhijia <chenzhijia@xiaomi.com>
+Date: Tue, 18 Jun 2024 18:19:18 +0800
+Subject: [PATCH] tlpi/proc:fix setenv case
+
+Remove duplicate functions and invalid commands
+
+Change-Id: I59d84511356f6da7313844bfad63ac466fd3075f
+Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>
+---
+
+diff --git a/proc/setenv.c b/proc/setenv.c
+index d396628..d75ae35 100644
+--- a/proc/setenv.c
++++ b/proc/setenv.c
+@@ -21,92 +21,25 @@
+ #include <errno.h>
+
+ int
+-unsetenv(const char *name)
+-{
+-    extern char **environ;
+-    char **ep, **sp;
+-    size_t len;
+-
+-    if (name == NULL || name[0] == '\0' || strchr(name, '=') != NULL) {
+-        errno = EINVAL;
+-        return -1;
+-    }
+-
+-    len = strlen(name);
+-
+-    for (ep = environ; *ep != NULL; )
+-        if (strncmp(*ep, name, len) == 0 && (*ep)[len] == '=') {
+-
+-            /* Remove found entry by shifting all successive entries
+-               back one element */
+-
+-            for (sp = ep; *sp != NULL; sp++)
+-                *sp = *(sp + 1);
+-
+-            /* Continue around the loop to further instances of 'name' */
+-
+-        } else {
+-            ep++;
+-        }
+-
+-    return 0;
+-}
+-
+-int
+-setenv(const char *name, const char *value, int overwrite)
+-{
+-    char *es;
+-
+-    if (name == NULL || name[0] == '\0' || strchr(name, '=') != NULL ||
+-            value == NULL) {
+-        errno = EINVAL;
+-        return -1;
+-    }
+-
+-    if (getenv(name) != NULL && overwrite == 0)
+-        return 0;
+-
+-    unsetenv(name);             /* Remove all occurrences */
+-
+-    es = malloc(strlen(name) + strlen(value) + 2);
+-                                /* +2 for '=' and null terminator */
+-    if (es == NULL)
+-        return -1;
+-
+-    strcpy(es, name);
+-    strcat(es, "=");
+-    strcat(es, value);
+-
+-    return (putenv(es) != 0) ? -1 : 0;
+-}
+-
+-#ifdef TEST_IT
+-
+-int
+ main()
+ {
+     if (putenv("TT=xxxxx") != 0)
+         perror("putenv");
+
+     system("echo '***** Environment before unsetenv(TT)'; "
+-            "printenv | grep ^TT");
+-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
++            "env");
+
+     unsetenv("TT");
+
+     system("echo '***** Environment after unsetenv(TT)'; "
+-            "printenv | grep ^TT");
+-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
++            "env");
+
+     setenv("xyz", "one", 1);
+     setenv("xyz", "two", 0);
+     setenv("xyz2", "222", 0);
+
+     system("echo '***** Environment after setenv() calls'; "
+-            "printenv | grep ^x");
+-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
++            "env");
+
+     exit(EXIT_SUCCESS);
+ }
+-
+-#endif

examples/tlpi/0003-fix-memoryleak-in-check_password.patch

@@ -0,0 +1,66 @@
+From 03445e7bf9916a58a4b80d7062d577f38ed2b279 Mon Sep 17 00:00:00 2001
+From: chenzhijia <chenzhijia@xiaomi.com>
+Date: Tue, 14 May 2024 16:40:28 +0800
+Subject: [PATCH] tlpi/users_groups:Fix memory leak in check_password
+
+free memory before program exits
+
+Change-Id: I28789b5ceaec4aaa45bb13f66cb3f61de1111841
+Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>
+---
+
+diff --git a/users_groups/check_password.c b/users_groups/check_password.c
+index c142ac7..a70cbb6 100644
+--- a/users_groups/check_password.c
++++ b/users_groups/check_password.c
+@@ -30,6 +30,22 @@
+ #include <shadow.h>
+ #include "tlpi_hdr.h"
+
++#define fatal(msg)    \
++  do                  \
++    {                 \
++      free(username); \
++      fatal(msg);     \
++    }                 \
++  while (0)
++
++#define errExit(msg)  \
++  do                  \
++    {                 \
++      free(username); \
++      errExit(msg);   \
++    }                 \
++  while (0)
++
+ int
+ main(int argc, char *argv[])
+ {
+@@ -53,7 +69,7 @@
+     printf("Username: ");
+     fflush(stdout);
+     if (fgets(username, lnmax, stdin) == NULL)
+-        exit(EXIT_FAILURE);             /* Exit on EOF */
++        goto err;             /* Exit on EOF */
+
+     len = strlen(username);
+     if (username[len - 1] == '\n')
+@@ -85,12 +101,17 @@
+     authOk = strcmp(encrypted, pwd->pw_passwd) == 0;
+     if (!authOk) {
+         printf("Incorrect password\n");
+-        exit(EXIT_FAILURE);
++        goto err;
+     }
+
+     printf("Successfully authenticated: UID=%ld\n", (long) pwd->pw_uid);
+
+     /* Now do authenticated work... */
+
++    free(username);
+     exit(EXIT_SUCCESS);
++
++err:
++    free(username);
++    exit(EXIT_FAILURE);
+ }

examples/tlpi/0004-fix-compilation-error.patch

@@ -0,0 +1,37 @@
+From 65230c70d69b253028c0f912dcd1ae0cb7446015 Mon Sep 17 00:00:00 2001
+From: chenzhijia <chenzhijia@xiaomi.com>
+Date: Wed, 30 Oct 2024 10:52:48 +0800
+Subject: [PATCH] tlpi/sockets:Fix compilation error
+
+Fix compilation error in qemu
+
+Change-Id: I854ed64d163398807a07fa697bdea89bfab77236
+Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>
+---
+
+diff --git a/sockets/list_host_addresses.c b/sockets/list_host_addresses.c
+index 4db58f6..e1864c8 100644
+--- a/sockets/list_host_addresses.c
++++ b/sockets/list_host_addresses.c
+@@ -23,7 +23,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <unistd.h>
+-#include <linux/if_link.h>
++//#include <linux/if_link.h>
+
+ int
+ main(int argc, char *argv[])
+diff --git a/sockets/sendfile.c b/sockets/sendfile.c
+index 54549d7..3697099 100644
+--- a/sockets/sendfile.c
++++ b/sockets/sendfile.c
+@@ -17,7 +17,7 @@
+ #include "tlpi_hdr.h"
+ #define BUF_SIZE 8192
+
+-ssize_t
++static ssize_t
+ sendfile(int out_fd, int in_fd, off_t *offset, size_t count)
+ {
+     off_t orig;

examples/tlpi/Kconfig

@@ -0,0 +1,23 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_TLPI
+	tristate "The Linux Programming Interface Example"
+	default n
+	depends on ALLOW_GPL_COMPONENTS
+	---help---
+		Enable the tlpi
+
+if EXAMPLES_TLPI
+
+config EXAMPLES_TLPI_PRIORITY
+	int "Task priority"
+	default 100
+
+config EXAMPLES_TLPI_STACKSIZE
+	int "Stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

examples/tlpi/Make.defs

@@ -0,0 +1,23 @@
+############################################################################
+# apps/examples/tlpi/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_TLPI),)
+CONFIGURED_APPS += $(APPDIR)/examples/tlpi
+endif