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libcamera: shared_mem_object: Fix compilation with uClibc

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uClibc doesn't provide a memfd_create() implementation. Fix it by using
a direct syscall when the function isn't available.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2024-05-03 03:37:10 +03:00
parent e0318c4776
commit acf61456cc
2 changed files with 10 additions and 0 deletions
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4
meson.build
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@ -82,6 +82,10 @@ if cc.has_header_symbol('locale.h', 'locale_t', prefix : '#define _GNU_SOURCE')
config_h.set('HAVE_LOCALE_T', 1) config_h.set('HAVE_LOCALE_T', 1)
endif endif
if cc.has_header_symbol('sys/mman.h', 'memfd_create', prefix : '#define _GNU_SOURCE')
config_h.set('HAVE_MEMFD_CREATE', 1)
endif
if cc.has_header_symbol('stdlib.h', 'secure_getenv', prefix : '#define _GNU_SOURCE') if cc.has_header_symbol('stdlib.h', 'secure_getenv', prefix : '#define _GNU_SOURCE')
config_h.set('HAVE_SECURE_GETENV', 1) config_h.set('HAVE_SECURE_GETENV', 1)
endif endif

6
src/libcamera/shared_mem_object.cpp
View file

@ -12,6 +12,8 @@
#include <stddef.h> #include <stddef.h>
#include <stdint.h> #include <stdint.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h> #include <unistd.h>
@ -56,7 +58,11 @@ SharedMem::SharedMem() = default;
*/ */
SharedMem::SharedMem(const std::string &name, std::size_t size) SharedMem::SharedMem(const std::string &name, std::size_t size)
{ {
#if HAVE_MEMFD_CREATE
int fd = memfd_create(name.c_str(), MFD_CLOEXEC); int fd = memfd_create(name.c_str(), MFD_CLOEXEC);
#else
int fd = syscall(SYS_memfd_create, name.c_str(), MFD_CLOEXEC);
#endif
if (fd < 0) if (fd < 0)
return; return;