ugly but working

Call_the_C/.gitignore

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+call_the_c
+*.o

Call_the_C/Makefile

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+#
+#	Fortran calls to a C function
+#
+
+all:	call_the_c
+
+# ----------------------------------------------------------
+
+first-try.o:	first-try.c Makefile
+	gcc -Wall -g -c $<
+
+soundfiles.o:	soundfiles.c Makefile
+	gcc -Wall -g -c $<
+
+# ----------------------------------------------------------
+
+call_the_c:	call_the_c.f90 Makefile first-try.o
+	gfortran -Wall -g $< first-try.o -o $@
+
+# ----------------------------------------------------------

Call_the_C/README.md

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+# Calling a C function
+
+WARNING : THIS IS A WIP !
+
+## Unix utilities
+
+getpid, sleep, ...
+
+## libsndfile
+
+Bibliothèque de fonctions pour lire et écrire les fichiers sonores.
+

Call_the_C/call_the_c.f90

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+program call_the_c
+  implicit none
+
+  integer                :: foo
+  integer, external      :: give_me_my_pid
+
+  print *, "XXX we are calling a C func"
+  call first_try ()
+  foo = give_me_my_pid()
+  print *, "process id = ", foo
+  print *, "XXX are we alive ?"
+
+end program
+
+

Call_the_C/first-try.c

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+/*
+ *		first try of a C func called from Fortran
+ */
+
+#include  <stdio.h>
+#include  <unistd.h>
+
+/* --------------------------------------------------------------- */
+void first_try_(void)
+{
+fprintf(stderr, "     pid=%u  file='%s'  func='%s' \n",
+		(long)getpid(), __FILE__, __func__);
+}
+/* --------------------------------------------------------------- */
+long give_me_my_pid_ (void)
+{
+pid_t		my_pid;
+
+my_pid = (long)getpid();
+fprintf(stderr, " %s -> %d\n", __func__, my_pid);
+
+return my_pid;
+}
+/* --------------------------------------------------------------- */

Call_the_C/soundfiles.c

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+/*
+ *			SOUNDFILES
+ *			----------
+ *
+ *	Interface pour libsndfile
+ */
+
+#include   <stdio.h>
+
+/* --------------------------------------------------------------- */
+/* --------------------------------------------------------------- */