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author | Conrad Meyer <cem@FreeBSD.org> | 2019-08-07 19:23:07 +0000 |
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committer | Conrad Meyer <cem@FreeBSD.org> | 2019-08-07 19:23:07 +0000 |
commit | 71db411eb627601a5f9a3464f88d75741927ce60 (patch) | |
tree | 5d8502ef6a3f77d7a07d6353221adb9872310040 /sys/sys/sbuf.h | |
parent | 29bf090e15533714696dc0eb8c3fe5550e89c569 (diff) | |
download | src-71db411eb627601a5f9a3464f88d75741927ce60.tar.gz src-71db411eb627601a5f9a3464f88d75741927ce60.zip |
sbuf(9): Add NOWAIT dynamic buffer extension mode
The goal is to avoid some kinds of low-memory deadlock when formatting
heap-allocated buffers.
Reviewed by: vangyzen
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D21015
Notes
Notes:
svn path=/head/; revision=350691
Diffstat (limited to 'sys/sys/sbuf.h')
-rw-r--r-- | sys/sys/sbuf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/sbuf.h b/sys/sys/sbuf.h index 4010f3b7d31c..3b099fe3f512 100644 --- a/sys/sys/sbuf.h +++ b/sys/sys/sbuf.h @@ -52,6 +52,7 @@ struct sbuf { #define SBUF_AUTOEXTEND 0x00000001 /* automatically extend buffer */ #define SBUF_INCLUDENUL 0x00000002 /* nulterm byte is counted in len */ #define SBUF_DRAINTOEOR 0x00000004 /* use section 0 as drain EOR marker */ +#define SBUF_NOWAIT 0x00000008 /* Extend with non-blocking malloc */ #define SBUF_USRFLAGMSK 0x0000ffff /* mask of flags the user may specify */ #define SBUF_DYNAMIC 0x00010000 /* s_buf must be freed */ #define SBUF_FINISHED 0x00020000 /* set by sbuf_finish() */ |