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CherryPick: Use openat syscall if available #18

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May 10, 2017
Merged

CherryPick: Use openat syscall if available #18

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5 changes: 5 additions & 0 deletions include/jemalloc/internal/jemalloc_internal_decls.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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* __NR_open may not exist on AArch64 (superseded by __NR_openat).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>
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3 changes: 3 additions & 0 deletions src/pages.c
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Expand Up @@ -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
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