From f2f3582b16a9a8fe203fbbc1eb1601be40e3ac64 Mon Sep 17 00:00:00 2001
From: Felix Moser <felix.moser@informatik.hs-fulda.de>
Date: Fri, 7 Feb 2025 14:31:56 +0100
Subject: [PATCH] fixedStructure
---
Processes/cpu_freq | Bin 16424 -> 16608 bytes
Processes/cpu_freq.c | 60 ++++++++++++----------
Processes/cpu_temp | Bin 16424 -> 16608 bytes
Processes/cpu_temp.c | 63 ++++++++++++++---------
main | Bin 16224 -> 16440 bytes
main.c | 117 +++++++++++++++++++++++++++++++++----------
6 files changed, 163 insertions(+), 77 deletions(-)
diff --git a/Processes/cpu_freq b/Processes/cpu_freq
index 69d08e6decf81aeefd3bc03d3d19fab205cde805..9b1a03b74468ef8dd78a4c76a83a75ea1ba86c17 100755
GIT binary patch
delta 3469
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diff --git a/Processes/cpu_freq.c b/Processes/cpu_freq.c
index b66a816..6efd32c 100644
--- a/Processes/cpu_freq.c
+++ b/Processes/cpu_freq.c
@@ -1,50 +1,58 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
-#include <sys/stat.h> //for pipes
+#include <sys/stat.h>
#include <fcntl.h>
+#include <string.h>
-void read_cpu_frequency()
+static const char *PIPE_TWO = "/tmp/pipeTwo";
+
+static void read_cpu_freq_and_write(int fd)
{
FILE *file;
char buffer[1024];
char *freq_path = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq";
file = fopen(freq_path, "r");
- if (file == NULL)
- {
- printf("Error opening file\n");
+ if (!file) {
+ perror("Failed to open CPU freq file");
return;
}
- if (fgets(buffer, sizeof(buffer), file) != NULL)
- {
+ if (fgets(buffer, sizeof(buffer), file) != NULL) {
+ // CPU frequency in kHz -> in GHz umrechnen
float freq = atol(buffer) / 1000000.0f;
- char message[1024];
- snprintf(message, sizeof(message), "%f", freq);
- printf("CPU frequency: %f GHz\n", freq);
-
- //write pipe
- const char *pTwo = "/tmp/pipeTwo";
- int vTwo = open(pTwo, O_WRONLY);
- if (vTwo == -1)
- {
- perror("Failed to open pipe two in read_cpu_frequency");
- return;
+ char message[128];
+ snprintf(message, sizeof(message), "%.3f", freq);
+
+ ssize_t written = write(fd, message, strlen(message) + 1);
+ if (written < 0) {
+ perror("write to pipeTwo");
+ } else {
+ printf("Wrote CPU freq: %s GHz\n", message);
}
- write(vTwo, message, sizeof(message));
- close(vTwo);
- }
- else
- {
- printf("Error reading file\n");
+ } else {
+ fprintf(stderr, "Error reading CPU freq\n");
}
+
fclose(file);
}
-int main(void) {
+int main(void)
+{
+ // Named Pipe einmal öffnen
+ mkfifo(PIPE_TWO, 0666);
+ int pipeFd = open(PIPE_TWO, O_WRONLY);
+ if (pipeFd == -1) {
+ perror("Failed to open pipeTwo for writing");
+ return 1;
+ }
+
while (1) {
- read_cpu_frequency();
+ read_cpu_freq_and_write(pipeFd);
+ sleep(1);
}
+
+ close(pipeFd);
return 0;
}
diff --git a/Processes/cpu_temp b/Processes/cpu_temp
index fa369854b5434e2ac46e93909ca2ec7f492f2e4e..b7e02c500a2f8157b5ee3a05791e4829aada9488 100755
GIT binary patch
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diff --git a/Processes/cpu_temp.c b/Processes/cpu_temp.c
index 801a433..9ff26c6 100644
--- a/Processes/cpu_temp.c
+++ b/Processes/cpu_temp.c
@@ -1,50 +1,63 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
-#include <sys/stat.h> //for pipes
+#include <sys/stat.h>
#include <fcntl.h>
+#include <string.h>
-void read_cpu_temp()
+static const char *PIPE_ONE = "/tmp/pipeOne";
+
+static void read_cpu_temp_and_write(int fd)
{
FILE *file;
char buffer[1024];
char *temp_path = "/sys/class/thermal/thermal_zone0/temp";
file = fopen(temp_path, "r");
- if (file == NULL)
- {
- printf("Error opening file\n");
+ if (!file) {
+ perror("Failed to open CPU temp file");
return;
}
- if (fgets(buffer, sizeof(buffer), file) != NULL)
- {
+ if (fgets(buffer, sizeof(buffer), file) != NULL) {
long temp = atol(buffer) / 1000;
- char message[1024];
+ // z.B. "42\n" => 42° C
+ char message[128];
snprintf(message, sizeof(message), "%ld", temp);
- printf("CPU temperature: %ld C\n", temp); // todo: print message instead of temp?
-
- // write pipe
- const char *pOne = "/tmp/pipeOne";
- int vOne = open(pOne, O_WRONLY);
- if (vOne == -1)
- {
- perror("Failed to open pipe one in read_cpu_temp");
- return;
+
+ // Schreiben, aber NICHT den FD schließen.
+ // Nur so viele Bytes schreiben, wie tatsächlich gebraucht werden.
+ ssize_t written = write(fd, message, strlen(message) + 1);
+ if (written < 0) {
+ perror("write to pipeOne");
+ } else {
+ printf("Wrote CPU temp: %s C\n", message);
}
- write(vOne, message, sizeof(message));
- close(vOne);
- }
- else
- {
- printf("Error reading file\n");
+ } else {
+ fprintf(stderr, "Error reading CPU temp\n");
}
+
fclose(file);
}
-int main(void) {
+int main(void)
+{
+ // Named Pipe einmal öffnen (Blockierend)
+ // Der mkfifo-Aufruf sollte idealerweise vorher im Setup passieren
+ // Falls sie nicht existiert, wird sie erzeugt
+ mkfifo(PIPE_ONE, 0666);
+ int pipeFd = open(PIPE_ONE, O_WRONLY);
+ if (pipeFd == -1) {
+ perror("Failed to open pipeOne for writing");
+ return 1;
+ }
+
while (1) {
- read_cpu_temp();
+ read_cpu_temp_and_write(pipeFd);
+ sleep(1);
}
+
+ // Nie erreicht im Beispiel, weil while(1)
+ close(pipeFd);
return 0;
}
diff --git a/main b/main
index d620ed2b993c96b62e0c8411c7c773dd8a1ad47e..98261929dd7adb1a4010b1d036332b20244b822a 100755
GIT binary patch
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diff --git a/main.c b/main.c
index fb29f7d..8c6a45d 100644
--- a/main.c
+++ b/main.c
@@ -1,39 +1,104 @@
#include <stdio.h>
#include <stdlib.h>
-#include <sys/stat.h> //for pipes
-#include <fcntl.h>
#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
-int main(void) {
- // create and open pipes
- const char *pOne = "/tmp/pipeOne";
- mkfifo(pOne, 0666);
- int vOne = open(pOne, O_RDONLY | O_NONBLOCK);
- if (vOne == -1)
- {
- perror("Failed to open pipe one in main");
+static const char *PIPE_ONE = "/tmp/pipeOne";
+static const char *PIPE_TWO = "/tmp/pipeTwo";
+
+int main(void)
+{
+ // mkfifo() nur ausführen, wenn die Pipes noch nicht existieren,
+ // bzw. Fehler ignorieren, falls schon existiert:
+ if (mkfifo(PIPE_ONE, 0666) < 0 && errno != EEXIST) {
+ perror("mkfifo pipeOne");
+ return 1;
+ }
+ if (mkfifo(PIPE_TWO, 0666) < 0 && errno != EEXIST) {
+ perror("mkfifo pipeTwo");
return 1;
}
- const char *pTwo = "/tmp/pipeTwo";
- mkfifo(pTwo, 0666);
- int vTwo = open(pTwo, O_RDONLY | O_NONBLOCK);
- if (vTwo == -1)
- {
- perror("Failed to open pipe two in main");
+ // Beide Pipes blockierend öffnen
+ int fdOne = open(PIPE_ONE, O_RDONLY);
+ if (fdOne == -1) {
+ perror("open pipeOne for reading");
return 1;
}
- // read pipes
- char mOne[1024] = {}; // for now only sending char with the pipe
- read(vOne, mOne, sizeof(mOne));
- printf("value one received: %s\n", mOne);
- close(vOne);
+ int fdTwo = open(PIPE_TWO, O_RDONLY);
+ if (fdTwo == -1) {
+ perror("open pipeTwo for reading");
+ close(fdOne);
+ return 1;
+ }
+
+ // Dauerhafte Lese-Schleife
+ while (1) {
+ char bufOne[128] = {0};
+ char bufTwo[128] = {0};
+
+ // =========== Lesevorgang PipeOne ===========
+ // read() kann blockieren, wenn noch keine Daten da sind,
+ // da wir blockierendes I/O verwenden.
+ // Wenn die Schreibseite offen bleibt, kommen periodisch neue Daten.
+ ssize_t bytesReadOne = read(fdOne, bufOne, sizeof(bufOne));
+ if (bytesReadOne > 0) {
+ // Gültige Daten -> ausgeben
+ printf("PipeOne CPU Temp: %s °C\n", bufOne);
+ } else if (bytesReadOne == 0) {
+ // EOF -> Schreibseite hat geschlossen
+ // -> ggf. Pipe erneut öffnen
+ printf("PipeOne closed by writer. Reopening...\n");
+ close(fdOne);
+
+ // Neu öffnen
+ fdOne = open(PIPE_ONE, O_RDONLY);
+ if (fdOne == -1) {
+ perror("Reopen pipeOne");
+ break; // oder return 1;
+ }
+ } else {
+ // bytesReadOne < 0 => Fehler
+ if (errno == EINTR) {
+ // Signal unterbrochen, einfach weiter
+ continue;
+ }
+ perror("read pipeOne");
+ break; // oder return 1;
+ }
+
+ // =========== Lesevorgang PipeTwo ===========
+ ssize_t bytesReadTwo = read(fdTwo, bufTwo, sizeof(bufTwo));
+ if (bytesReadTwo > 0) {
+ printf("PipeTwo CPU Freq: %s GHz\n", bufTwo);
+ } else if (bytesReadTwo == 0) {
+ printf("PipeTwo closed by writer. Reopening...\n");
+ close(fdTwo);
+ fdTwo = open(PIPE_TWO, O_RDONLY);
+ if (fdTwo == -1) {
+ perror("Reopen pipeTwo");
+ break;
+ }
+ } else {
+ if (errno == EINTR) {
+ continue;
+ }
+ perror("read pipeTwo");
+ break;
+ }
+
+ // Kurze Pause, damit CPU-Last nicht durch
+ // Dauerschleife hochgetrieben wird
+ usleep(200000); // 200 ms
+ }
- char mTwo[1024] = {};
- read(vTwo, mTwo, sizeof(mTwo));
- printf("value two received: %s\n", mTwo);
- close(vTwo);
+ // Sollte man jemals aus der while(1)-Schleife ausbrechen:
+ close(fdOne);
+ close(fdTwo);
return 0;
-}
\ No newline at end of file
+}
--
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