diff options
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/spawni.c | 24 |
2 files changed, 25 insertions, 6 deletions
@@ -1,3 +1,10 @@ +2017-10-20 Adhemerval Zanella <adhemerval.zanella@linaro.org> + + [BZ #22273] + * sysdeps/unix/sysv/linux/spawni.c (__spawnix): Handle the case where + the auxiliary process is terminated by a signal before calling _exit + or execve. + 2017-10-20 H.J. Lu <hongjiu.lu@intel.com> [BZ #21265] diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c index dea1650..d15fbb1 100644 --- a/sysdeps/unix/sysv/linux/spawni.c +++ b/sysdeps/unix/sysv/linux/spawni.c @@ -17,7 +17,6 @@ <http://www.gnu.org/licenses/>. */ #include <spawn.h> -#include <assert.h> #include <fcntl.h> #include <paths.h> #include <string.h> @@ -268,7 +267,6 @@ __spawni_child (void *arguments) __sigprocmask (SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK) ? &attr->__ss : &args->oldmask, 0); - args->err = 0; args->exec (args->file, args->argv, args->envp); /* This is compatibility function required to enable posix_spawn run @@ -339,7 +337,7 @@ __spawnix (pid_t * pid, const char *file, /* Child must set args.err to something non-negative - we rely on the parent and child sharing VM. */ - args.err = -1; + args.err = 0; args.file = file; args.exec = exec; args.fa = file_actions; @@ -362,12 +360,26 @@ __spawnix (pid_t * pid, const char *file, new_pid = CLONE (__spawni_child, STACK (stack, stack_size), stack_size, CLONE_VM | CLONE_VFORK | SIGCHLD, &args); + /* It needs to collect the case where the auxiliary process was created + but failed to execute the file (due either any preparation step or + for execve itself). */ if (new_pid > 0) { + /* Also, it handles the unlikely case where the auxiliary process was + terminated before calling execve as if it was successfully. The + args.err is set to 0 as default and changed to a positive value + only in case of failure, so in case of premature termination + due a signal args.err will remain zeroed and it will be up to + caller to actually collect it. */ ec = args.err; - assert (ec >= 0); - if (ec != 0) - __waitpid (new_pid, NULL, 0); + if (ec > 0) + /* There still an unlikely case where the child is cancelled after + setting args.err, due to a positive error value. Also due a + possible pid reuse race (where the kernel allocated the same pid + to unrelated process) we need not to undefinitely hang expecting + an invalid pid. In both cases an error is returned to the + caller. */ + __waitpid (new_pid, NULL, WNOHANG); } else ec = -new_pid; |