First commit

content/progsys/TDM_6-tubes/index.md

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+---
+title: "TDM6 : les tubes"
+date: 2018-10-09
+---
+
+

content/progsys/TDM_6-tubes/src/q1.c

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+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#define BUFFMAX 256
+#define OUTPATH "packages.list"
+
+int main (int argc, char **argv) {
+    pid_t pid;
+    int fds[2], status;
+   if (pipe(fds) == -1) {
+            perror ("Unable to create pipe");
+    }
+    
+    pid = fork();
+    if (pid == -1) {
+        perror("Unable to fork");
+    }
+
+    else if(pid > 0){
+        // father
+        printf("Fork : Init father...\n");
+        if (close(fds[1]) == -1) {
+            perror("Unable to close pipe from parent");
+        }
+        // Waiting for children to terminate
+        char buff[BUFFMAX];
+        FILE *fout = fopen(OUTPATH,"w");
+        if ( fout == NULL ){
+           perror("");
+        }
+        int n;
+        while ((n=read(fds[0], &buff, BUFFMAX)) > 0){
+            if ( fwrite(&buff, n, 1, fout) == -1 ){
+                perror("Error when writing output");
+            }
+        }
+        if ( fclose(fout) == -1){
+            perror("Error ou outp[ut file close");
+        }
+        wait(&status);
+    }
+    else {
+        // children
+        if (close(fds[0]) == -1) {
+            perror("Unable to close pipe from child");
+        }
+        if ( dup2(fds[1], STDOUT_FILENO) != STDOUT_FILENO){
+           perror("Unable to duplicate files descriptors");
+        }
+        if ( close(fds[1]) == -1 ){
+            perror ("error on pipe in close");
+        }
+        execlp("pacman","pacman","-Qs", NULL);
+     }
+     exit(EXIT_SUCCESS);
+}