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core: add runtime fallback for nonpresent getrandom() sycall

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The current compile-time-check only tests for the getrandom() syscall
wrapper of libc. The presence of this wrapper however does not relate to
the presence of the actual syscall at runtime.
This commit is contained in:
Thomas Weißschuh 2021-11-02 17:55:24 +01:00
parent 25ddf0e3cf
commit 7d9b49293c
1 changed files with 10 additions and 6 deletions
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16
src/pipewire/impl-core.c
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@ -34,18 +34,22 @@
#include <sys/random.h>
#endif
#ifndef HAVE_GETRANDOM
#include <fcntl.h>
static ssize_t pw_getrandom(void *buf, size_t buflen, unsigned int flags) {
ssize_t bytes;
#ifdef HAVE_GETRANDOM
bytes = getrandom(buf, buflen ,flags);
if (!(bytes == -1 && errno == ENOSYS))
return bytes;
#endif
ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
int fd = open("/dev/urandom", O_CLOEXEC);
if (fd < 0)
return -1;
ssize_t bytes = read(fd, buf, buflen);
bytes = read(fd, buf, buflen);
close(fd);
return bytes;
}
#endif
#include <spa/utils/string.h>
#include <spa/debug/types.h>
@ -429,7 +433,7 @@ struct pw_impl_core *pw_context_create_core(struct pw_context *context,
this->info.host_name = pw_get_host_name();
this->info.version = pw_get_library_version();
do {
res = getrandom(&this->info.cookie,
res = pw_getrandom(&this->info.cookie,
sizeof(this->info.cookie), 0);
} while ((res == -1) && (errno == EINTR));
if (res == -1) {