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notmuch-deliver: Use splice() if it's available

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NOTMUCH_DELIVER_NO_SPLICE environment variable may be set to fallback to
the read/write method.
This commit is contained in:
Ali Polatel 2010-05-26 14:21:15 +03:00
parent c145323120
commit 73258fec79
2 changed files with 107 additions and 31 deletions
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2
contrib/notmuch-deliver/configure.ac
View file

@ -67,7 +67,7 @@ AC_STRUCT_TM
dnl }}}
dnl {{{ Check for library functions
AC_CHECK_FUNCS([setgroups initgroups symlink readlink strcasecmp utime utimes])
AC_CHECK_FUNCS([setgroups initgroups symlink readlink strcasecmp utime utimes splice])
dnl }}}
dnl {{{ gethostname()

136
contrib/notmuch-deliver/src/main.c
View file

@ -26,7 +26,12 @@
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SPLICE
#include <fcntl.h>
#endif
#ifdef HAVE_SYSEXITS_H
#include <sysexits.h>
@ -136,11 +141,96 @@ load_keyfile(const gchar *path, gchar **db_path, gchar ***tags)
return TRUE;
}
#ifdef HAVE_SPLICE
static int
save_splice(int fdin, int fdout)
{
int ret, written, pfd[2];
if (pipe(pfd) < 0) {
g_critical("Failed to create pipe: %s", g_strerror(errno));
return EX_IOERR;
}
for (;;) {
ret = splice(fdin, NULL, pfd[1], NULL, 4096, 0);
if (!ret)
break;
if (ret < 0) {
g_critical("Splicing data from standard input failed: %s",
g_strerror(errno));
close(pfd[0]);
close(pfd[1]);
return EX_IOERR;
}
do {
written = splice(pfd[0], NULL, fdout, NULL, ret, 0);
if (!written) {
g_critical("Splicing data to temporary file failed: %s",
g_strerror(errno));
close(pfd[0]);
close(pfd[1]);
return EX_IOERR;
}
if (written < 0) {
g_critical("Splicing data to temporary file failed: %s",
g_strerror(errno));
close(pfd[0]);
close(pfd[1]);
return EX_IOERR;
}
ret -= written;
} while (ret);
}
close(pfd[0]);
close(pfd[1]);
return 0;
}
#endif /* HAVE_SPLICE */
static int
save_readwrite(int fdin, int fdout)
{
int ret, written;
char buf[4096], p;
for (;;) {
ret = read(fdin, buf, 4096);
if (!ret)
break;
if (ret < 0) {
if (errno == EINTR)
continue;
g_critical("Reading from standard input failed: %s",
g_strerror(errno));
return EX_IOERR;
}
p = buf;
do {
written = write(fdout, p, ret);
if (!written)
return EX_IOERR;
if (written < 0) {
if (errno == EINTR)
continue;
g_critical("Writing to temporary file failed: %s",
g_strerror(errno));
return EX_IOERR;
}
p += written;
ret -= written;
} while (ret);
}
return 0;
}
static int
save_maildir(int fdin, const char *dir, int auto_create, char **path)
{
int fd, ret, written;
char buf[4096], *p;
int fdout, ret;
struct maildir_tmpcreate_info info;
maildir_tmpcreate_init(&info);
@ -148,7 +238,7 @@ save_maildir(int fdin, const char *dir, int auto_create, char **path)
info.maildir = dir;
info.doordie = 1;
while ((fd = maildir_tmpcreate_fd(&info)) < 0)
while ((fdout = maildir_tmpcreate_fd(&info)) < 0)
{
if (errno == ENOENT && auto_create && maildir_mkdir(dir) == 0)
{
@ -162,34 +252,17 @@ save_maildir(int fdin, const char *dir, int auto_create, char **path)
}
g_debug("Reading from standard input and writing to `%s'", info.tmpname);
for (;;) {
ret = read(fdin, buf, 4096);
if (!ret)
break;
if (ret < 0) {
if (errno == EINTR)
continue;
g_critical("Reading from standard input failed: %s", g_strerror(errno));
goto fail;
}
p = buf;
do {
written = write(fd, p, ret);
if (!written)
goto fail;
if (written < 0) {
if (errno == EINTR)
continue;
g_critical("Writing to temporary file `%s' failed: %s",
info.tmpname, g_strerror(errno));
goto fail;
}
p += written;
ret -= written;
} while (ret);
}
#ifdef HAVE_SPLICE
ret = g_getenv("NOTMUCH_DELIVER_NO_SPLICE")
? save_readwrite(fdin, fdout)
: save_splice(fdin, fdout);
#else
ret = save_readwrite(fdin, fdout);
#endif /* HAVE_SPLICE */
if (ret)
goto fail;
close(fd);
close(fdout);
g_debug("Moving `%s' to `%s'", info.tmpname, info.newname);
if (maildir_movetmpnew(info.tmpname, info.newname)) {
g_critical("Moving `%s' to `%s' failed: %s",
@ -295,6 +368,9 @@ main(int argc, char **argv)
" "PACKAGE" uses notmuch's configuration file to determine database path and\n"
" initial tags to add to new messages. You may set NOTMUCH_CONFIG environment\n"
" variable to specify an alternative configuration file.\n"
"\nEnvironment:\n"
" NOTMUCH_CONFIG: Path to notmuch configuration file\n"
" NOTMUCH_DELIVER_NO_SPLICE: Don't use splice() even if it's available\n"
"\nExit codes:\n"
" 0 => Successful run\n"
" 64 => Usage error\n"