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-rw-r--r--ch8/8-03_fflush-and-fclose.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/ch8/8-03_fflush-and-fclose.c b/ch8/8-03_fflush-and-fclose.c
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+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "syscalls.h"
+/* The C Programming Language: 2nd Edition
+ *
+ * Exercise 8-3: Design and write `_flushbuf`, `fflush`, and `fclose`.
+ *
+ * Notes: Not much guidance here, eh? :) We'll want to consult manpages.
+ *
+ * _flushbuf returns 0 on success, -1 on failure.
+ * fflush flushes a buffer, or *all* buffers
+ * fclose does housekeeping on _iob members so fds can be juggled
+ *
+ * Since work done in these exercises is predominantly in a header file, the
+ * final implementation is used for all exercises that rely on it. Attempts
+ * have been made to demonstrate *what* is being done, but it's difficult to do
+ * so without creating side effects inside the buffers themselves. Trust that
+ * if this file outputs its own source, everything is fine.
+ */
+
+int main() {
+ /* Let's copy 8-2's exercise but get a different look on the buffer. */
+ /* show the contents of buffers before and after flush */
+ FILE *fp = fopen("8-03_fflush-and-fclose.c", "r");
+ if (fp != NULL) {
+ char c;
+ while ((c = getc(fp)) != EOF) {
+ putchar(c);
+ }
+ /* fclose calls fflush */
+ fclose(fp);
+ fclose(stdout);
+ } else {
+ puts("Could not open file for reading.");
+ }
+ return 0;
+}
>Remove ID field from DBzlg3-38/+46 2018-10-06cli: change "Status" heading to "Progress"zlg2-36/+40 2018-09-29Bump to 0.3alpha5 for PyPIzlg1-1/+1 2018-09-29cli: Add pretty printing to 'list' commandzlg3-17/+107 2018-09-08setup.py: Bump to alpha4 for PyPIzlg1-1/+1 2018-09-08cli: add '--raw' option to list commandzlg2-9/+45 2018-09-08Add remaining filters to vgstash packagezlg1-2/+11 2018-09-04Update LICENSE to match setup.pyzlg1-80/+67 2018-09-03Branch off from master with pytest, tox, clickzlg16-778/+779 2018-03-18Flesh out filter types and ownership statuszlg3-82/+144 2018-03-18README.mdown: break line correctlyzlg1-1/+1 2018-03-18add 'playlog' list filterzlg2-2/+9 2018-03-13Update helpers a bitzlg1-2/+9 2018-03-13Make VGSTASH_DB_LOCATION point to a filezlg2-21/+20 2016-11-18Remove settings from helpers.shZe Libertine Gamer1-5/+0 2016-11-15Correct phrasing in README.Ze Libertine Gamer1-4/+4 2016-11-13DerpZe Libertine Gamer1-0/+1 2016-11-03Improve error handling in shell scriptsZe Libertine Gamer4-3/+23 2016-10-24Correct run_again, add recursionZe Libertine Gamer1-0/+4 2016-10-21Add quotes to correct behavior for arglistZe Libertine Gamer1-1/+1 2016-10-14updater.sh: add recursion, error handlingZe Libertine Gamer1-43/+101 2016-10-14Correct pipe-handling behaviorZe Libertine Gamer1-1/+9 2016-10-12Clarify a method to move between platformsZe Libertine Gamer1-2/+5