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Use openat syscall if available

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Some architectures like AArch64 may not have the open syscall because it
was superseded by the openat syscall, so check and use SYS_openat if
SYS_open is not available.

Additionally, Android headers for AArch64 define SYS_open to __NR_open,
even though __NR_open is undefined. Undefine SYS_open in that case so
SYS_openat is used.
This commit is contained in:
Jim Chen 2017-04-19 15:40:29 -04:00 • committed by Jason Evans
parent 807a9a3e17
commit 7883c7749f
3 changed files with 11 additions and 0 deletions
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5
include/jemalloc/internal/jemalloc_internal_decls.h
View file

@ -14,6 +14,11 @@
# if !defined(SYS_write) && defined(__NR_write)
# define SYS_write __NR_write
# endif
# if defined(SYS_open) && defined(__aarch64__)
/* Android headers may define SYS_open to __NR_open even though
* __NR_open may not exist on AArch64 (superseded by __NR_openat). */
# undef SYS_open
# endif
# include <sys/uio.h>
# endif
# include <pthread.h>

3
src/arena.c
View file

@ -3842,6 +3842,9 @@ init_thp_initially_huge(void) {
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
fd = (int)syscall(SYS_open,
"/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#elif defined(JEMALLOC_USE_SYSCALL) && defined(SYS_openat)
fd = (int)syscall(SYS_openat,
AT_FDCWD, "/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#else
fd = open("/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#endif

3
src/pages.c
View file

@ -250,6 +250,9 @@ os_overcommits_proc(void)
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
#elif defined(JEMALLOC_USE_SYSCALL) && defined(SYS_openat)
fd = (int)syscall(SYS_openat,
AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY);
#else
fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
#endif