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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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4
CMakeLists.txt
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@@ -144,6 +144,7 @@ check_include_file(stdint.h HAVE_STDINT_H)
check_include_file(stdlib.h HAVE_STDLIB_H)
check_include_file(sys/cdefs.h HAVE_SYS_CDEFS_H)
check_include_file(sys/param.h HAVE_SYS_PARAM_H)
check_include_file(sys/random.h HAVE_SYS_RANDOM_H)
check_include_file(sys/stat.h HAVE_SYS_STAT_H)
check_include_file(xlocale.h HAVE_XLOCALE_H)
@@ -190,6 +191,9 @@ endif()
if (HAVE_SYSLOG_H)
check_symbol_exists(vsyslog "syslog.h" HAVE_VSYSLOG)
endif()
if (HAVE_SYS_RANDOM_H)
check_symbol_exists(getrandom "sys/random.h" HAVE_GETRANDOM)
endif()
if (HAVE_SYS_RESOURCE_H)
check_symbol_exists(getrusage "sys/resource.h" HAVE_GETRUSAGE)
endif()