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strbuf: add strbuf_read_once to read without blocking

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The new call will read from a file descriptor into a strbuf once. The
underlying call xread is just run once. xread only reattempts
reading in case of EINTR, which makes it suitable to use for a
nonblocking read.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller
2015-12-15 16:04:08 -08:00
committed by Junio C Hamano
parent 1079c4be0b
commit b4e04fb66e
2 changed files with 19 additions and 0 deletions
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8
strbuf.h
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@ -366,6 +366,14 @@ extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
*/
extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint);
/**
* Read the contents of a given file descriptor partially by using only one
* attempt of xread. The third argument can be used to give a hint about the
* file size, to avoid reallocs. Returns the number of new bytes appended to
* the sb.
*/
extern ssize_t strbuf_read_once(struct strbuf *, int fd, size_t hint);
/**
* Read the contents of a file, specified by its path. The third argument
* can be used to give a hint about the file size, to avoid reallocs.