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diff -ru cvs-1.12.13.orig/src/main.c cvs-1.12.13/src/main.c
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--- cvs-1.12.13.orig/src/main.c	2022-10-20 15:44:42.306215161 +0200
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+++ cvs-1.12.13/src/main.c	2022-10-20 15:50:55.838352069 +0200
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@@ -24,10 +24,6 @@
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 #include "strftime.h"
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 #include "xgethostname.h"
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-#ifdef USE_LIBBSD
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-uint32_t arc4random(void);
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-#endif
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-
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 const char *program_name;
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 const char *program_path;
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 const char *cvs_cmd_name;
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@@ -749,10 +745,13 @@
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     /* Calculate the cvs global session ID */
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+	int random;
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+	getentropy(&random, sizeof(int));
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+
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     global_session_id = Xasprintf("1%010llX%04X%04X",
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       (unsigned long long)time(NULL),
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       (unsigned int)(getpid() & 0xFFFF),
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-      (unsigned int)(arc4random() & 0xFFFF));
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+      (unsigned int)random & 0xFFFF);
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     TRACE (TRACE_FUNCTION, "main: Session ID is %s", global_session_id);
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