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Cojack
n00b
Joined: 06 Feb 2003
Posts: 32
Location: Seattle, WA USA
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 Posted: Sun Oct 19, 2003 10:34 pm Post subject: Suspending a process |
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I'm looking for a way to suspend/resume another user's running process. I've tried using the STOP and CONT signals with kill, but the program just bombed out. Is this the fault of the program, or something I could overcome with a different command?
Any help would be appreciated.
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dma
Guru
Joined: 31 Jan 2003
Posts: 437
Location: Charlotte, NC, USA
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| Posted: Sun Oct 19, 2003 10:41 pm Post subject: |
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| Code: | root@laureate:/usr/include# stty -a
speed 38400 baud; rows 24; columns 80; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
From stty(1):
susp CHAR
CHAR will send a terminal stop signal
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kill -STOP (some-pine-pid)
I tried it with pine and it works, but "fg" doesn't restore the terminal junk properly. No problems with "cat". Not sure how to restart it from the outside. |
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nephros
Advocate
Joined: 07 Feb 2003
Posts: 2139
Location: Graz, Austria (Europe - no kangaroos.)
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| Posted: Sun Oct 19, 2003 11:04 pm Post subject: |
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STOP and CONT are the correct signals for this and they usually work well. But you can't send them to processes you don't own (unless $UID==0 of course).
Which program are you talking about? It probably doesn't do proper signal handling.
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nephros
Advocate
Joined: 07 Feb 2003
Posts: 2139
Location: Graz, Austria (Europe - no kangaroos.)
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| Posted: Sun Oct 19, 2003 11:12 pm Post subject: |
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| dma wrote: | | Code: | root@laureate:/usr/include# stty -a
speed 38400 baud; rows 24; columns 80; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
From stty(1):
susp CHAR
CHAR will send a terminal stop signal
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I'm curious: are ^Q and ^S equivalent to SIGSTOP and SIGCONT?
I always thought they just made the shell block stdout so the app can't write on it anymore while the signals really stop the program execution.
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