From b9d884addfe5f9da3ab6936ae9d53cf42a8503be Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Thu, 18 Oct 2018 12:34:24 +0800
Subject: [PATCH] Add charpter1 file I/O example source code
---
ch1/file_io.c | 44 +++++++++++
ch1/syserr.c | 23 +++++
ch1/access.c | 27 ++++++
ch1/dir.c | 78 +++++++++++++++++++
ch1/stat.c | 15 +++
ch1/redirect_stdio.c | 28 +++++++
ch1/stdout.c | 14 +++
7 files changed, 229 insertions(+), 0 deletions(-)
diff --git a/ch1/access.c b/ch1/access.c
new file mode 100644
index 0000000..46c2b0d
--- /dev/null
+++ b/ch1/access.c
@@ -0,0 +1,27 @@
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define TEST_FILE "access.c"
+
+int main(void)
+{
+ if( access(TEST_FILE, F_OK)!=0 )
+ {
+ printf("File %s not exist!\n", TEST_FILE);
+ return 0;
+ }
+
+ printf("File %s exist!\n", TEST_FILE);
+
+ if(access(TEST_FILE, R_OK)==0)
+ printf("READ OK\n");
+
+ if(access(TEST_FILE, W_OK)==0)
+ printf("WRITE OK\n");
+
+ if(access(TEST_FILE, X_OK)==0)
+ printf("EXEC OK\n");
+
+ return 0;
+}
diff --git a/ch1/dir.c b/ch1/dir.c
new file mode 100644
index 0000000..e62a56e
--- /dev/null
+++ b/ch1/dir.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+
+#define TEST_DIR "dir"
+
+int main(int argc, char **argv)
+{
+ int rv;
+ int fd1;
+ int fd2;
+ DIR *dirp;
+ struct dirent *direntp;
+
+ if( mkdir(TEST_DIR, 0755)<0 )
+ {
+ printf("create directory '%s' failure: %s\n", TEST_DIR, strerror(errno));
+ return -1;
+ }
+
+ if( chdir(TEST_DIR)<0 )
+ {
+ printf("Change directory to '%s' failure: %s\n", TEST_DIR, strerror(errno));
+ rv = -2;
+ goto cleanup;
+ }
+
+ if( (fd1=creat("file1.txt", 0644)) < 0 )
+ {
+ printf("Create file1.txt failure: %s\n", strerror(errno));
+ rv = -3;
+ goto cleanup;
+ }
+
+ if( (fd2=creat("file2.txt", 0644)) < 0 )
+ {
+ printf("Create file2.txt failure: %s\n", strerror(errno));
+ rv = -4;
+ goto cleanup;
+ }
+
+ if( chdir("../")<0 )
+ {
+ printf("Change directory to '%s' failure: %s\n", TEST_DIR, strerror(errno));
+ rv = -5;
+ goto cleanup;
+ }
+
+ if((dirp=opendir(TEST_DIR)) == NULL)
+ {
+ rv = -6;
+ printf("opendir %s error: %s\n", TEST_DIR, strerror(errno));
+ goto cleanup;
+ }
+
+ while((direntp = readdir(dirp)) != NULL)
+ {
+ printf("Find file: %s\n", direntp->d_name);
+ }
+
+ closedir(dirp);
+
+cleanup:
+ if(fd1 >= 0)
+ {
+ close(fd1);
+ }
+
+ if(fd2 >= 0)
+ {
+ close(fd2);
+ }
+
+}
diff --git a/ch1/file_io.c b/ch1/file_io.c
new file mode 100644
index 0000000..cc1f391
--- /dev/null
+++ b/ch1/file_io.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define BUFSIZE 1024
+#define MSG_STR "Hello World\n"
+
+int main(int argc, char *argv[])
+{
+ int fd = -1;
+ int rv = -1;
+ char buf[BUFSIZE];
+
+ fd=open("test.txt", O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if(fd < 0)
+ {
+ perror("Open/Create file test.txt failure");
+ return 0;
+ }
+ printf("Open file returned file descriptor [%d]\n", fd);
+
+ if( (rv=write(fd, MSG_STR, strlen(MSG_STR))) < 0 )
+ {
+ printf("Write %d bytes into file failure: %s\n", rv, strerror(errno));
+ goto cleanup;
+ }
+
+ //memset(buf, 0, sizeof(buf));
+ if( (rv=read(fd, buf, sizeof(buf))) < 0 )
+ {
+ printf("Read data from file failure: %s\n", strerror(errno));
+ goto cleanup;
+ }
+
+ printf("Read %d bytes data from file: %s\n", rv, buf);
+
+cleanup:
+ close(fd);
+
+ return 0;
+}
diff --git a/ch1/redirect_stdio.c b/ch1/redirect_stdio.c
new file mode 100644
index 0000000..52270f0
--- /dev/null
+++ b/ch1/redirect_stdio.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main(int argc, char *argv)
+{
+ int fd = -1;
+
+ fd = open("std.txt", O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if(fd < 0)
+ {
+ printf("Open file failure: %s\n", strerror(errno));
+ return ;
+ }
+
+ dup2(fd, STDIN_FILENO);
+ dup2(fd, STDOUT_FILENO);
+ dup2(fd, STDERR_FILENO);
+
+ printf("fd=%d\n", fd);
+
+ close(fd);
+}
+
diff --git a/ch1/stat.c b/ch1/stat.c
new file mode 100644
index 0000000..bf3ba9d
--- /dev/null
+++ b/ch1/stat.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int main (int argc, char **argv)
+{
+ struct stat stbuf;
+
+ stat("stat.c", &stbuf);
+ printf("File Mode: %o Real Size: %luB, Space Size: %luB\n", stbuf.st_mode, stbuf.st_size, stbuf.st_blksize);
+
+ return 0;
+}
+
diff --git a/ch1/stdout.c b/ch1/stdout.c
new file mode 100644
index 0000000..bc11354
--- /dev/null
+++ b/ch1/stdout.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+#define MSG_STR "Hello World\n"
+
+int main(int main, char *argv[])
+{
+ printf("%s", MSG_STR);
+ fputs(MSG_STR, stdout);
+ write(STDOUT_FILENO, MSG_STR, strlen(MSG_STR));
+
+ return 0;
+}
diff --git a/ch1/syserr.c b/ch1/syserr.c
new file mode 100644
index 0000000..75a34ac
--- /dev/null
+++ b/ch1/syserr.c
@@ -0,0 +1,23 @@
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main(int argc, char **argv)
+{
+ char *file_name = "/test.txt";
+ int fd=-1;
+
+ fd=open(file_name, O_RDONLY, 066);
+ if( fd < 0 )
+ {
+ perror("Open file failure");
+ printf("Open file %s failure: %s\n", file_name, strerror(errno));
+ return 0;
+ }
+
+ close(fd);
+}
--
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