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Use getrandom() if available in json_c_get_random_seed

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Lower overhead than opening & reading from /dev/urandom, and works
in chroots and other situtations where /dev/urandom is not available.
Falls back to existing methods when kernel doesn't support the syscall.
This commit is contained in:
Alan Coopersmith
2020-07-30 16:13:04 -07:00
parent 002411293d
commit 6cf4847796
3 changed files with 51 additions and 0 deletions
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6
cmake/config.h.in
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@@ -56,6 +56,9 @@
/* Define to 1 if you have the <sys/param.h> header file. */
#cmakedefine HAVE_SYS_PARAM_H @HAVE_SYS_PARAM_H@
/* Define to 1 if you have the <sys/random.h> header file. */
#cmakedefine HAVE_SYS_RANDOM_H
/* Define to 1 if you have the <sys/resource.h> header file. */
#cmakedefine HAVE_SYS_RESOURCE_H
@@ -140,6 +143,9 @@
/* Define to 1 if you have the `vsyslog' function. */
#cmakedefine HAVE_VSYSLOG @HAVE_VSYSLOG@
/* Define if you have the `getrandom' function. */
#cmakedefine HAVE_GETRANDOM
/* Define if you have the `getrusage' function. */
#cmakedefine HAVE_GETRUSAGE