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authorLaurent Bercot <ska-skaware@skarnet.org>2014-12-18 19:06:06 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2014-12-18 19:06:06 +0000
commit5f76ed9108c5c48850cf339096527c4d53f0bc12 (patch)
tree6ccf306c97ccea0021bfea2f70c3654501953b45 /src/libstddjb/child_spawn1_internal.c
parentb19b3e0682d6e224c12b35308772114fe27372fe (diff)
downloadskalibs-5f76ed9108c5c48850cf339096527c4d53f0bc12.tar.xz
Separate socket from pipe in child_spawn. Less code in skaclient!
Diffstat (limited to 'src/libstddjb/child_spawn1_internal.c')
-rw-r--r--src/libstddjb/child_spawn1_internal.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/libstddjb/child_spawn1_internal.c b/src/libstddjb/child_spawn1_internal.c
new file mode 100644
index 0000000..68b0242
--- /dev/null
+++ b/src/libstddjb/child_spawn1_internal.c
@@ -0,0 +1,125 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/djbunix.h>
+
+#ifdef SKALIBS_HASPOSIXSPAWN
+
+#include <signal.h>
+#include <spawn.h>
+#include <stdlib.h>
+#include <skalibs/config.h>
+#include <skalibs/env.h>
+
+pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
+{
+ posix_spawn_file_actions_t actions ;
+ posix_spawnattr_t attr ;
+ int e ;
+ pid_t pid ;
+ int haspath = !!env_get("PATH") ;
+ to = !!to ;
+ if (coe(p[!to]) < 0) { e = errno ; goto err ; }
+ e = posix_spawnattr_init(&attr) ;
+ if (e) goto err ;
+ {
+ sigset_t set ;
+ sigemptyset(&set) ;
+ e = posix_spawnattr_setsigmask(&attr, &set) ;
+ }
+ if (e) goto errattr ;
+ e = posix_spawn_file_actions_init(&actions) ;
+ if (e) goto errattr ;
+ e = posix_spawn_file_actions_addclose(&actions, p[!to]) ;
+ if (e) goto erractions ;
+ e = posix_spawn_file_actions_adddup2(&actions, p[to], to) ;
+ if (e) goto erractions ;
+ if (!haspath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) { e = errno ; goto erractions ; }
+ e = posix_spawnp(&pid, prog, &actions, &attr, (char *const *)argv, (char *const *)envp) ;
+ if (!haspath) unsetenv("PATH") ;
+ posix_spawn_file_actions_destroy(&actions) ;
+ posix_spawnattr_destroy(&attr) ;
+ fd_close(p[to]) ;
+ if (e) goto errp ;
+ return pid ;
+
+ erractions:
+ posix_spawn_file_actions_destroy(&actions) ;
+ errattr:
+ posix_spawnattr_destroy(&attr) ;
+ err:
+ fd_close(p[to]) ;
+ errp:
+ fd_close(p[!to]) ;
+ errno = e ;
+ return 0 ;
+}
+
+#else
+
+#include <skalibs/allreadwrite.h>
+#include <skalibs/sig.h>
+
+pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
+{
+ int e ;
+ int syncp[2] ;
+ pid_t pid ;
+ if (coe(p[0]) < 0 || pipecoe(syncp) < 0)
+ {
+ e = errno ;
+ fd_close(p[1]) ;
+ fd_close(p[0]) ;
+ errno = e ;
+ return 0 ;
+ }
+ to = !!to ;
+ pid = fork() ;
+ if (pid < 0)
+ {
+ e = errno ;
+ fd_close(syncp[1]) ;
+ fd_close(syncp[0]) ;
+ fd_close(p[1]) ;
+ fd_close(p[0]) ;
+ errno = e ;
+ return 0 ;
+ }
+ if (pid)
+ {
+ fd_close(syncp[0]) ;
+ fd_close(p[!to]) ;
+ if (fd_move(to, p[to]) < 0) goto err ;
+ sig_blocknone() ;
+ pathexec_run(prog, argv, envp) ;
+err:
+ e = errno ;
+ fd_write(syncp[1], (char *)&e, sizeof(e)) ;
+ _exit(127) ;
+ }
+ fd_close(syncp[1]) ;
+ fd_close(p[to]) ;
+ syncp[1] = fd_read(syncp[0], (char *)&e, sizeof(e)) ;
+ if (syncp[1] < 0)
+ {
+ e = errno ;
+ fd_close(syncp[0]) ;
+ fd_close(p[!to]) ;
+ errno = e ;
+ return 0 ;
+ }
+ fd_close(syncp[0]) ;
+ if (syncp[1] == sizeof(e))
+ {
+ fd_close(p[!to]) ;
+ wait_pid(pid, &syncp[1]) ;
+ errno = e ;
+ return 0 ;
+ }
+ return pid ;
+}
+
+#endif