Use openat syscall if available
Some architectures like AArch64 may not have the open syscall because it was superseded by the openat syscall, so check and use SYS_openat if SYS_open is not available.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.
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@ -14,6 +14,11 @@
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# if !defined(SYS_write) && defined(__NR_write)
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# if !defined(SYS_write) && defined(__NR_write)
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# define SYS_write __NR_write
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# define SYS_write __NR_write
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# endif
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# endif
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# if defined(SYS_open) && defined(__aarch64__)
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/* Android headers may define SYS_open to __NR_open even though
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* __NR_open may not exist on AArch64 (superseded by __NR_openat). */
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# undef SYS_open
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# endif
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# include <sys/uio.h>
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# include <sys/uio.h>
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# endif
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# endif
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# include <pthread.h>
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# include <pthread.h>
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@ -351,6 +351,9 @@ os_overcommits_proc(void) {
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#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
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#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
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fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
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fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
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#elif defined(JEMALLOC_USE_SYSCALL) && defined(SYS_openat)
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fd = (int)syscall(SYS_openat,
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AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY);
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#else
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#else
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fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
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fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
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#endif
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#endif
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