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authorLaurent Bercot <ska-skaware@skarnet.org>2015-01-19 16:11:24 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2015-01-19 16:11:24 +0000
commit701540827e27a4f07ac725db3ce361d3be0c106f (patch)
tree98c4b2fb8ba8f69ef791feebdcd61cd5bca34140 /src/libs6/s6_fdholder_getdump.c
parent83853a80eb18238796154164f9ea776b0c167ab7 (diff)
downloads6-701540827e27a4f07ac725db3ce361d3be0c106f.tar.xz
- added the s6_fdholder library to libs6. (Nothing useful yet.)
- fixed execline invocation in s6-log with slashpackage - integrated s6_svc_main.c's functionality into s6-svscanctl and deleted it - integrated Olivier Brunel's suggestions for wstat report in supervise/status - minor fixes to s6-supervise's status reports - separated sigaction calls in ftrigw_notifyb, this spares a few syscalls in s6-supervise - updated doc to reflect the changes - version bumped to 2.1.0.0 because API breakage (./finish, s6-svstat)
Diffstat (limited to 'src/libs6/s6_fdholder_getdump.c')
-rw-r--r--src/libs6/s6_fdholder_getdump.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/libs6/s6_fdholder_getdump.c b/src/libs6/s6_fdholder_getdump.c
new file mode 100644
index 0000000..3fce3a7
--- /dev/null
+++ b/src/libs6/s6_fdholder_getdump.c
@@ -0,0 +1,73 @@
+ /* ISC license. */
+
+#include <errno.h>
+#include <skalibs/uint32.h>
+#include <skalibs/error.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/tai.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unixmessage.h>
+#include <s6/s6-fdholder.h>
+
+int s6_fdholder_getdump (s6_fdholder_t *a, genalloc *g, tain_t const *deadline, tain_t *stamp)
+{
+ unixmessage_t m = { .s = "?", .len = 1, .fds = 0, .nfds = 0 } ;
+ uint32 ntot, n ;
+ unsigned int oldlen = genalloc_len(s6_fdholder_fd_t, g) ;
+ unsigned int i = 0 ;
+ int ok ;
+ if (!unixmessage_put(&a->connection.out, &m)) return 0 ;
+ if (!unixmessage_sender_timed_flush(&a->connection.out, deadline, stamp)) return 0 ;
+ if (!unixmessage_timed_receive(&a->connection.in, &m, deadline, stamp)) return 0 ;
+ if (!m.len || m.nfds) return (errno = EPROTO, 0) ;
+ if (m.s[0]) return (errno = m.s[0], 0) ;
+ if (m.len != 9) return (errno = EPROTO, 0) ;
+ uint32_unpack_big(m.s + 1, &n) ;
+ uint32_unpack_big(m.s + 5, &ntot) ;
+ if (!ntot) return 1 ;
+ if (n != 1 + (ntot-1) / UNIXMESSAGE_MAXFDS) return (errno = EPROTO, 0) ;
+ ok = genalloc_readyplus(s6_fdholder_fd_t, g, ntot) ;
+
+ for (; i < n ; i++)
+ {
+ if (!unixmessage_timed_receive(&a->connection.in, &m, deadline, stamp)) goto err ;
+ if (genalloc_len(s6_fdholder_fd_t, g) + m.nfds > ntot) goto droperr ;
+ if (ok)
+ {
+ s6_fdholder_fd_t *tab = genalloc_s(s6_fdholder_fd_t, g) + genalloc_len(s6_fdholder_fd_t, g) ;
+ unsigned int i = 0 ;
+ for (; i < m.nfds ; i++)
+ {
+ unsigned char thislen ;
+ if (m.len < TAIN_PACK + 3) goto droperr ;
+ tain_unpack(m.s, &tab[i].limit) ;
+ m.s += TAIN_PACK ; m.len -= TAIN_PACK + 1 ;
+ thislen = *m.s++ ;
+ if (thislen > m.len - 1 || thislen > S6_FDHOLDER_ID_SIZE || m.s[thislen]) goto droperr ;
+ byte_copy(tab[i].id, thislen, m.s) ;
+ byte_zero(tab[i].id + thislen, S6_FDHOLDER_ID_SIZE + 1 - thislen) ;
+ m.s += (unsigned int)thislen + 1 ; m.len -= (unsigned int)thislen + 1 ;
+ tab[i].fd = m.fds[i] ;
+ }
+ genalloc_setlen(s6_fdholder_fd_t, g, genalloc_len(s6_fdholder_fd_t, g) + m.nfds) ;
+ }
+ else unixmessage_drop(&m) ;
+ }
+
+ if (!ok) return (errno = ENOMEM, 0) ;
+ return 1 ;
+
+ droperr:
+ unixmessage_drop(&m) ;
+ errno = EPROTO ;
+ err:
+ {
+ int e = errno ;
+ i = genalloc_len(s6_fdholder_fd_t, g) ;
+ while (i-- > oldlen) fd_close(genalloc_s(s6_fdholder_fd_t, g)[i].fd) ;
+ genalloc_setlen(s6_fdholder_fd_t, g, oldlen) ;
+ errno = e ;
+ }
+ return 0 ;
+}