Re: Behaviour of call-process

Jan Vroonhof <vroonhof(a)math.ethz.ch&gt; writes: No, the normal fork() will be used. I have done some analysis, but can not provide a patch: 1. The problems occurs in the X11-mode only. Under "xemacs -nw" "call-process" works like expected. 2. The backtrace is -------------------------------- #0 0x40491ef4 in __libc_read () #1 0x8647b50 in ?? () #2 0x80d5af3 in read_allowing_quit (fildes=13, buf=0x8647b78, size=512) at fileio.c:293 #3 0x8120f1a in filedesc_reader (stream=0x8647b08, data=0x8647b78 "h¯M＠h¯M＠", size=512) at lstream.c:931 #4 0x81202e0 in Lstream_raw_read (lstr=0x8647b08, buffer=0x8647b78 "h¯M＠h¯M＠", size=512) at lstream.c:509 #5 0x8120399 in Lstream_read_more (lstr=0x8647b08) at lstream.c:527 #6 0x81204f5 in Lstream_read (lstr=0x8647b08, data=0xbfffb000, size=16384) at lstream.c:571 #7 0x806918a in Fcall_process_internal (nargs=5, args=0xbffff15c) at callproc.c:453 #8 0x808f6e6 in Ffuncall (nargs=6, args=0xbffff158) at eval.c:3206 -------------------------------- 3. libc_read(), called by sys_read_1() in sysdep.c (the #1 above), gets in the console-mode a SIGINT signal but in the X11-mode not. strace says under X11: .... access("/bin/sleep", X_OK) = 0 open("/dev/null", O_RDONLY) = 11 pipe([12, 13]) = 0 fork() = 567 close(13) = 0 close(11) = 0 close(13) = -1 EBADF (Bad file descriptor) lseek(12, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek) read(12, "", [.... now it stops ....] 512) --- SIGCHLD (Der Kind-Prozeß ist beendet) --- and at the console: .... access("/bin/sleep", X_OK) = 0 open("/dev/null", O_RDONLY) = 10 pipe([11, 12]) = 0 fork() = 627 close(12) = 0 close(10) = 0 close(12) = -1 EBADF (Bad file descriptor) lseek(11, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek) read(11, 0x850c960, 512) = ? ERESTARTSYS (To be restarted) --- SIGINT (Unterbrechung) --- write(9, "\0", 1) = 1 sigreturn() = ? (mask now []) kill(-627, SIGINT) = 0 write(1, "\33[37;1HWaiting for process to "..., 82) = 82 wait4(627, [WIFSIGNALED(s) && WTERMSIG(s) == SIGINT], 0, NULL) = 627 --- SIGCHLD (Der Kind-Prozeß ist beendet) --- 4. The console-xemacs calls a lot of ioctl's setting the SIGINT character. This calls are missing under X11 naturally. I am not very familiarly with the internal xemacs structures and process-flows, but I hope this mail helps a little bit. Enrico -- eMail: enrico.scholz(a)wirtschaft.tu-chemnitz.de talk: ensc(a)ultra.csn.tu-chemnitz.de