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Add comments to retain context for syscall usage in file read/write.

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guangli-dai 2026-07-30 09:51:53 -07:00 • committed by Guangli Dai
parent e465b4cbba
commit 5421943db7
1 changed files with 8 additions and 0 deletions
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8
include/jemalloc/internal/os/posix/file.h
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@ -14,6 +14,14 @@
JEMALLOC_ALWAYS_INLINE ssize_t
os_file_write_once(int fd, const void *buf, size_t bytes) {
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_write)
/*
* Use syscall(2) rather than write(2) when possible in order to avoid
* the possibility of memory allocation within libc. This is necessary
* on FreeBSD; most operating systems do not have this problem though.
*
* syscall() returns long or int, depending on platform, so capture the
* result in the widest plausible type to avoid compiler warnings.
*/
return (ssize_t)syscall(SYS_write, fd, buf, bytes);
#else
return (ssize_t)write(fd, buf, bytes);