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author | Sebastian Andrzej Siewior | 2014-01-18 21:24:58 +0100 |
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committer | Jason A. Donenfeld | 2014-01-19 15:08:49 +0100 |
commit | d3581b58890389794de5d5222c91a0129873e95c (patch) | |
tree | 95c4010b61869934cca86c5ac23056463754f2ee /cache.c | |
parent | ea7210bef377be4ffb088a1a8e5a9dd354f82afb (diff) | |
download | cgit-d3581b58890389794de5d5222c91a0129873e95c.tar cgit-d3581b58890389794de5d5222c91a0129873e95c.tar.gz cgit-d3581b58890389794de5d5222c91a0129873e95c.zip |
cache: use sendfile() instead of a pair of read() + write()
sendfile() does the same job and avoids to copy the content into userland
and back. One has to define NO_SENDFILE in case the OS (kernel / libc)
does not supported. It is disabled by default on non-linux environemnts.
According to the glibc, sendfile64() was added in Linux 2.4 (so it has
been there for a while) but after browsing over the mapage of FreeBSD's I
noticed that the prototype is little different.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Diffstat (limited to 'cache.c')
-rw-r--r-- | cache.c | 26 |
1 files changed, 25 insertions, 1 deletions
@@ -13,6 +13,9 @@ * */ +#ifdef HAVE_LINUX_SENDFILE +#include <sys/sendfile.h> +#endif #include "cgit.h" #include "cache.h" #include "html.h" @@ -30,7 +33,6 @@ struct cache_slot { const char *lock_name; int match; struct stat cache_st; - struct stat lock_st; int bufsize; char buf[CACHE_BUFSIZE]; }; @@ -81,6 +83,23 @@ static int close_slot(struct cache_slot *slot) /* Print the content of the active cache slot (but skip the key). */ static int print_slot(struct cache_slot *slot) { +#ifdef HAVE_LINUX_SENDFILE + off_t start_off; + int ret; + + start_off = slot->keylen + 1; + + do { + ret = sendfile(STDOUT_FILENO, slot->cache_fd, &start_off, + slot->cache_st.st_size - start_off); + if (ret < 0) { + if (errno == EAGAIN || errno == EINTR) + continue; + return errno; + } + return 0; + } while (1); +#else ssize_t i, j; i = lseek(slot->cache_fd, slot->keylen + 1, SEEK_SET); @@ -97,6 +116,7 @@ static int print_slot(struct cache_slot *slot) return errno; else return 0; +#endif } /* Check if the slot has expired */ @@ -188,6 +208,10 @@ static int fill_slot(struct cache_slot *slot) /* Generate cache content */ slot->fn(); + /* update stat info */ + if (fstat(slot->lock_fd, &slot->cache_st)) + return errno; + /* Restore stdout */ if (dup2(tmp, STDOUT_FILENO) == -1) return errno; |