From: Jorgen Schaefer <forcer@forcix.cx>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: 17561@debbugs.gnu.org
Subject: bug#17561: Emacs can forget processes
Date: Wed, 28 May 2014 22:53:46 +0200 [thread overview]
Message-ID: <20140528225346.227e166d@forcix.jorgenschaefer.de> (raw)
In-Reply-To: <5385322D.7030406@cs.ucla.edu>
On Tue, 27 May 2014 17:47:41 -0700
Paul Eggert <eggert@cs.ucla.edu> wrote:
> I'm still suspicious of the interaction between pthread_sigmask and
> vfork, though. What happens if you do the following shell session,
> where "$" is the shell prompt and "(gdb)" is the GDB prompt?
Assuming you meant in an Emacs with vfork enabled (i.e. the default):
> $ grep -i pthread src/config.h
/* Define to 1 if you have pthread (-lpthread). */
#define HAVE_PTHREAD 1
/* Define to 1 if you have the <pthread.h> header file. */
#define HAVE_PTHREAD_H 1
/* Define to 1 if the pthread_sigmask function can be used (despite bugs). */
/* #undef HAVE_PTHREAD_SIGMASK */
/* Define to 1 if pthread_sigmask(), when it fails, returns -1 and sets errno.
/* #undef PTHREAD_SIGMASK_FAILS_WITH_ERRNO */
/* Define to 1 if pthread_sigmask() may returns 0 and have no effect. */
/* #undef PTHREAD_SIGMASK_INEFFECTIVE */
/* Define to 1 if pthread_sigmask() unblocks signals incorrectly. */
/* #undef PTHREAD_SIGMASK_UNBLOCK_BUG */
#define PTY_TTY_NAME_SPRINTF { char *ptyname = 0; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); if (grantpt (fd) != -1 && unlockpt (fd) != -1) ptyname = ptsname(fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (!ptyname) { emacs_close (fd); return -1; } snprintf (pty_name, PTY_NAME_SIZE, "%s", ptyname); }
#ifndef _POSIX_PTHREAD_SEMANTICS
# define _POSIX_PTHREAD_SEMANTICS 1
> $ ldd src/bootstrap-emacs | grep -i pthread
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f0c1cf79000)
> $ gdb src/bootstrap-emacs
> (gdb) disas rpl_pthread_sigmask
No symbol "rpl_pthread_sigmask" in current context.
> (gdb) disas pthread_sigmask
Dump of assembler code for function pthread_sigmask:
0x00000000005642c0 <+0>: sub $0x8,%rsp
0x00000000005642c4 <+4>: callq 0x405790 <sigprocmask@plt>
0x00000000005642c9 <+9>: xor %edx,%edx
0x00000000005642cb <+11>: test %eax,%eax
0x00000000005642cd <+13>: jns 0x5642d6 <pthread_sigmask+22>
0x00000000005642cf <+15>: callq 0x405a10 <__errno_location@plt>
0x00000000005642d4 <+20>: mov (%rax),%edx
0x00000000005642d6 <+22>: mov %edx,%eax
0x00000000005642d8 <+24>: add $0x8,%rsp
0x00000000005642dc <+28>: retq
End of assembler dump.
> (gdb) disas rpl_vfork
No symbol "rpl_vfork" in current context.
> (gdb) disas vfork
Dump of assembler code for function vfork@plt:
0x0000000000405ed0 <+0>: jmpq *0x39e662(%rip) # 0x7a4538 <vfork@got.plt>
0x0000000000405ed6 <+6>: pushq $0xfc
0x0000000000405edb <+11>: jmpq 0x404f00
End of assembler dump.
> (gdb) disas rpl_fork
No symbol "rpl_fork" in current context.
> (gdb) disas fork
Dump of assembler code for function fork@plt:
0x0000000000405cb0 <+0>: jmpq *0x39e772(%rip) # 0x7a4428 <fork@got.plt>
0x0000000000405cb6 <+6>: pushq $0xda
0x0000000000405cbb <+11>: jmpq 0x404f00
End of assembler dump.
Regards,
Jorgen
next prev parent reply other threads:[~2014-05-28 20:53 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-23 15:52 bug#17561: 24.4.50; Emacs can forget processes Jorgen Schaefer
2014-05-23 16:28 ` bug#17561: " Paul Eggert
2014-05-23 16:44 ` Jorgen Schaefer
2014-05-24 23:01 ` Paul Eggert
2014-05-25 7:57 ` Jorgen Schaefer
2014-05-26 17:08 ` Paul Eggert
2014-05-26 18:49 ` Jorgen Schaefer
2014-05-26 23:58 ` Paul Eggert
2014-05-27 18:27 ` Jorgen Schaefer
2014-05-27 21:42 ` Paul Eggert
2014-05-27 22:16 ` Jorgen Schaefer
2014-05-28 0:47 ` Paul Eggert
2014-05-28 20:53 ` Jorgen Schaefer [this message]
2014-05-28 23:00 ` Paul Eggert
2014-05-28 23:35 ` Jorgen Schaefer
2014-05-29 1:22 ` Paul Eggert
2014-05-29 10:08 ` Jorgen Schaefer
2014-05-29 23:15 ` Paul Eggert
2014-05-29 4:17 ` Paul Eggert
2014-05-29 11:39 ` Jorgen Schaefer
2014-05-29 15:09 ` Paul Eggert
2014-05-29 15:22 ` Andreas Schwab
2014-05-29 15:26 ` Paul Eggert
2014-05-29 17:03 ` Jorgen Schaefer
2014-05-29 17:55 ` Andreas Schwab
2014-05-29 18:23 ` Jorgen Schaefer
2014-05-29 19:06 ` Jorgen Schaefer
2014-05-29 20:27 ` Andreas Schwab
2014-05-29 19:15 ` Andreas Schwab
2014-05-30 6:07 ` Paul Eggert
2014-05-30 20:41 ` Jorgen Schaefer
2014-05-30 21:29 ` Paul Eggert
2014-05-27 4:05 ` Paul Eggert
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