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2 changed files with 88 additions and 1 deletions
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@ -13,6 +13,7 @@ page_for: "sp1-lesson"
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- `mkrepo` zum Aufgaben-Repo erstellen
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- `mkrepo` zum Aufgaben-Repo erstellen
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- `deadline` zum Abgabetermine nachschauen
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- `deadline` zum Abgabetermine nachschauen
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- Vorgegebene Compiler-Flags: `-std=c11` `-pedantic` `-D_XOPEN_SOURCE=700` `-Wall` `-Werror` `-fsanitize=undefined` `-fno-sanitize-recover` `-g`
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- Vorgegebene Compiler-Flags: `-std=c11` `-pedantic` `-D_XOPEN_SOURCE=700` `-Wall` `-Werror` `-fsanitize=undefined` `-fno-sanitize-recover` `-g`
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- Debugger Valgrind kann so ausgeführt werden: `valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes ./--track-fds=yes ./lilo`
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## Wichtige Links
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## Wichtige Links
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- [Aufgaben](https://sys.cs.fau.de/lehre/ss25/sp1/uebung#aufgaben)
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- [Aufgaben](https://sys.cs.fau.de/lehre/ss25/sp1/uebung#aufgaben)
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@ -40,4 +41,4 @@ page_for: "sp1-lesson"
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- [Lukas (T03)](https://wwwcip.cs.fau.de/~uk16isyq/)
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- [Lukas (T03)](https://wwwcip.cs.fau.de/~uk16isyq/)
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- [Julian (T08)](https://jzbor.de/tut/sp1/)
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- [Julian (T08)](https://jzbor.de/tut/sp1/)
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- [Luca (T11)](https://wwwcip.cs.fau.de/~am99ihig/sp)
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- [Luca (T11)](https://wwwcip.cs.fau.de/~am99ihig/sp)
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- [Philip (ehemalig)](https://wwwcip.cs.fau.de/~oj14ozun/sp1/)
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- [Philip (ehemalig)](https://wwwcip.cs.fau.de/~oj14ozun/sp1/) (Hier ist das sp-quiz!)
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86
src/sp1/ub3.md
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86
src/sp1/ub3.md
Normal file
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@ -0,0 +1,86 @@
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---
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title: "Übung 03 - Prozesse"
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layout: "blog-post.njk"
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tags: "sp1-lesson"
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date: 2025-05-19
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---
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### waitpid()
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Mit `waitpid()` können Informationen über den Exitstatus eines Kindprozesses abgefragt werden.
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By default wartet waitpid, bis das angegebene Kind terminiert. Falls das nicht gewünscht ist, kann options=WNOHANG als Argument von waitpid() angegeben werden.
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## Beispiel Programme aus der Präsenzübung
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### `listRun.c`: Übergebenes Programm mehrfach mit verschiedenen Argumenten aufrufen
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```c
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int main(int argc, char *argv[]) {
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if (argc < 3) {
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exit(EXIT_FAILURE);
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}
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char *command = argv[1];
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for (int i = 2; i < argc; i++) {
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pid_t pid = fork();
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if (pid == -1) {
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// Fehler
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perror("fork");
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exit(EXIT_FAILURE);
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} else if (pid == 0) {
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// Child
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if (execlp(command, command, argv[i], NULL) == -1) {
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perror("execlp");
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}
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exit(EXIT_FAILURE);
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} else {
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// Parent (pid == child's pid)
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int status;
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waitpid(pid, &status, 0);
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// ... waitpid Fehlerbehandlung
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if (WIFEXITED(status)) {
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fprintf(stderr, "Exitstatus: %d\n", WEXITSTATUS(status));
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// ... fprintf Fehlerbehandlung
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}
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}
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}
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}
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```
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### Makefile für `listRun.c`
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```Makefile
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CC=gcc
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CFLAGS=-std=c11 -pedantic -Wall -Werror -fsanitize=undefined -fno-sanitize-recover -g -D_XOPEN_SOURCE=700
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all: listRun
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listRun: listRun.o
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$(CC) $(CFLAGS) -o listRun listRun.o
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listRun.o: listRun.c
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$(CC) $(CFLAGS) -o listRun.o -c listRun.c
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clean:
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rm -rf listRun listRun.o
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.PHONY: all clean
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```
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### strtok-test
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```c
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char *argv[]) {
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char str[] = "hello world"; // auf dem stack, damit schreibbar
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char *token;
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token = strtok(str, " ");
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while (token != NULL) {
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printf("%s\n", token);
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token = strtok(NULL, " ");
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}
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}
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```
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