int main(int argc, char *argv[])
{
FILE *fp;
// stdin, stdout, stderr connected to terminal
fputs("enter any character\n", stdout);
if (getchar() == EOF) {
perror("getchar err");
}
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ((fp = fopen("/etc/magic", "r")) == NULL) {
perror("fopen err");
}
if (getc(fp) == EOF) {
perror("getc");
}
pr_stdio("/etc/magic", fp);
fclose(fp);
//int stat(const char *path, struct stat *buf);
struct stat sbuf;
if (stat("/etc/magic", &sbuf) < 0) {
perror("stat");
}
printf("blksize = %d\n", (int)sbuf.st_blksize);
return 0;
}
int main(int argc, const char *argv[])
{
FILE *fp;
fputs("enter any character\n", stdout);
if(getchar() == EOF) {
printf("getchar error\n");
return 1;
}
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if((fp = fopen("/etc/inputrc", "r")) == NULL) {
perror("fopen");
return 2;
}
if(getc(fp) == EOF) {
printf("getc error\n");
}
pr_stdio("/etc/inputrc", fp);
return 0;
}
int main(int argc, char *argv[])
{
FILE *fp;
printf("enter any character:");
if (getchar() == EOF)
{
perror("getchar");
return -1;
}
fputs("line from stderr.\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
fp = fopen("stdio.c", "r");
if (fp == NULL)
{
perror("fopen");
}
pr_stdio("fp", fp);
fclose(fp);
return 0;
}
int
main(void)
{
FILE *fp = NULL;
fputs("enter any character\n", stdout);
if (getchar() == EOF)
{
err_sys("getchar error");
}
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ((fp = fopen("/etc/passwd", "r")) == NULL)
{
err_sys("fopen error");
}
if (getc(fp) == EOF)
{
err_sys("getc error");
}
pr_stdio("/etc/passwd", fp);
exit(0);
}
int main()
{
FILE *fp = NULL;
printf("enter any charactors\n");
if(getchar() == EOF){
printf("getchar error\n");
exit(-1);
}
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if((fp = fopen("/etc/motd", "r")) == NULL){
printf("fopen error\n");
exit(-1);
}
printf("fp addr0 = %p\n", fp);
if(getc(fp) == EOF){
printf("fopen error\n");
}
printf("fp addr1 = %p\n", fp);
exit(0);
}
int main(void) {
FILE *fp;
char buf[BUFSIZ];
if((fp = tmpfile()) == NULL)
err_sys("tmpfile error");
fputs("one line of output\n", fp);
pr_stdio("tempfile", fp);
fputs("close file buffer\n", stdout);
my_setbuf(fp, NULL);
pr_stdio("tempfile", fp);
fputs("set file buffer\n", stdout);
my_setbuf(fp, buf);
pr_stdio("tempfile", fp);
return 0;
}
int main()
{
FILE *fp;
fputs("enter any character\n",stdout);
if(getchar()==EOF)
printf("getchar error\n");
fputs("one line to stderr\n",stderr);
pr_stdio("stdin",stdin);
pr_stdio("stdout",stdout);
pr_stdio("stderr",stderr);
if((fp=fopen("/etc/motd","r"))==NULL)
printf("fopen error\n");
if(getc(fp)==EOF)
printf("getc error\n");
pr_stdio("/etc/motd",fp);
exit(0);
}
int main(void)
{
FILE *fp;
fputs("enter any character\n", stdout);
if (getchar() == EOF)
err_sys("getchar error");
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ( (fp = fopen("/etc/hosts", "r")) == NULL)
err_sys("fopen error");
if (getc(fp) == EOF)
err_sys("getc error");
pr_stdio("/etc/hosts", fp);
exit(EXIT_SUCCESS);
}
int main( int argc, char *argv[] )
{
FILE *fp;
fputs("enter any character\n", stdout);
if ( getchar() == EOF )
err_sys("getchar error");
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ( (fp = fopen("/etc/motd", "r")) == NULL )
err_sys("fopen error");
if ( getc(fp) == EOF )
err_sys("getc error");
pr_stdio("/etc/motd", fp);
exit(0);
}
int main( int argc, char **argv ) {
FILE *fp;
fputs( "enter any character\n", stdout );
if ( getchar() == EOF ) {
err_sys( "getchar error" );
}
fputs( "one line to standard error\n", stderr );
pr_stdio( "stdin", stdin );
pr_stdio( "stdout", stdout );
pr_stdio( "stderr", stderr );
if ( (fp = fopen( "/etc/motd", "r" )) == NULL ) {
err_sys( "fopen error on /etc/motd" );
}
if ( getc( fp ) == EOF ) {
err_sys( "getc error" );
}
pr_stdio( "/etc/motd", fp );
return 0;
}
int main(void)
{
FILE *fp;
fputs("enter any character\n", stdout);
if (getchar() == EOF)
err_sys("getchar error");
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ( (fp = fopen("junk", "r")) == NULL)
err_sys("fopen error");
if (getc(fp) == EOF)
err_sys("getc error");
pr_stdio("junk", fp);
ExitProcess(0);
}
int main()
{
FILE* fp;
/*
* 在打印缓冲状态之前，先对每个流执行IO操作，第一个IO通常就造成为该流分配缓冲
*/
fputs("enter any character\n", stdout);
if ( getchar() == EOF )
err_sys("getchar error");
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin);
pr_stdio("stdout", stdout);
pr_stdio("stderr", stderr);
if ( (fp = fopen("/etc/passwd", "r")) == NULL )
err_sys("fopen error");
if ( getc(fp) == EOF )
err_sys("getc error");
pr_stdio("/etc/passwd", fp);
return 0;
}
int main(void) {
FILE* fp;
fputs("enter any character\n", stdout);
if (getchar() == EOF) {
printf("getchar error");
}
fputs("one line to standard error\n", stderr);
pr_stdio("stdin", stdin); //
pr_stdio("stdout", stdout); //
pr_stdio("stderr", stderr); //
if ((fp = fopen("/etc/motd", "r")) == NULL) { //
printf("fopen error");
}
if (fgetc(fp) == EOF) {
printf("getc error");
}
pr_stdio("/etc/motd", fp);
return (0);
}
