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ISC2
os
exercises
Commits
b45c7bf6
Commit
b45c7bf6
authored
1 year ago
by
iliya.saroukha
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finished ex2
parent
6f0673d5
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serie1/ex2/Makefile
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serie1/ex2/Makefile
serie1/ex2/ex2.md
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serie1/ex2/ex2.md
serie1/ex2/prog.c
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serie1/ex2/prog.c
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serie1/ex2/Makefile
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b45c7bf6
...
...
@@ -15,6 +15,8 @@ $(TARGET): prog.o
$(
CC
)
$(
CFLAGS
)
-c
$<
@
printf
"
\n
"
.PHONY
:
clean
clean
:
rm
-f
*
.o
$(
TARGET
)
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serie1/ex2/ex2.md
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b45c7bf6
# Expliquez précisément pourquoi le programme produit ce message à double
Suite au fait que
`stdout`
est flushé
**après**
l'appel de
`fork()`
, vu que le
buffer est dupliqué dans le processus enfant, cela cause un affichage double.
Afin d'éviter cela, il aurait fallu flushé
`stdout`
avant l'appel à
`fork()`
.
```
c
printf
(
"Voilà un mystère digne de Sherlock Holmes !
\n
"
);
fork
();
```
# Modifiez le code en utilisant `setbuf` afin de corriger l'affichage
```
c
#include
<stdio.h>
#include
<unistd.h>
int
main
(
void
)
{
setbuf
(
stdout
,
NULL
);
printf
(
"Voilà un mystère digne de Sherlock Holmes !"
);
fork
();
printf
(
"
\n
"
);
return
0
;
}
```
# Déterminez l'appel système utilisé lors de l'utilisation de la fonction `fork`
Le nom de l'appel système est
`clone`
```
sh
clone
(
child_stack
=
NULL,
flags
=
CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr
=
0x7f7c06d06350
)
=
266166
```
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serie1/ex2/prog.c
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b45c7bf6
...
...
@@ -2,6 +2,7 @@
#include
<unistd.h>
int
main
(
void
)
{
setbuf
(
stdout
,
NULL
);
printf
(
"Voilà un mystère digne de Sherlock Holmes !"
);
fork
();
printf
(
"
\n
"
);
...
...
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