Bug 84667

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Description of problem:
I have a shell script say A that starts another script say B, and then C.  B is
my backup script, i.e., a long running script that runs a number of rsync
processes in parallel.  C shuts down all my local hosts.

The problem seems to be a SIGINT handling isue in bash.  If it's synchronously
waiting for a foreground process to finish, it propagates the SIGINT from the
child's exist status to itself, but if it's waiting for several background
processes, it doesn't.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Create a shell script B that runs say some hundred sleep processes in
background, then waits for them to complete, a script C that prints a message to
stdout, and a script A that goes B then C (the scripts are going in an attachment)
2.Start A, and type ^C while B and the sleep processes are running

Actual Results:  You will see the message from C gets printed depending on
whether B runs sleep in foreground or just waits for the background processes to
complete.  Another oddity is that sleep doesn't terminate on SIGINT, 

Expected Results:  A shouldn't get to the point of running C in either case,
since it was already interrupted while running B.

Additional info:

A:
#! /bin/sh
B ${1+"$@"}; C

B:
#! /bin/sh
count=0
maxcount=${1-15}
while test $count -lt $maxcount; do
  sleep ${2-300} &
  count=`expr $count + 1`
done
echo started $maxcount sleep ${2-10} processes, now waiting...
# sleep ${2-300}  # this line is enabled in the second run
wait
echo all sleep processes completed

C:
#! /bin/sh
echo running C
sleep 2
echo finishing C

9895 is A, 9896 is B, 9897 is background sleep started by B
[pid  9895] wait4(-1,  <unfinished ...>
[pid  9896] wait4(-1,  <unfinished ...>
[pid  9897] gettimeofday({1045716721, 777963}, NULL) = 0
[pid  9897] nanosleep({247, 342004000},  <unfinished ...>
[pid  9895] <... wait4 resumed> 0xbffff2d8, 0, NULL) = ? ERESTARTSYS (To be
restarted)
[pid  9896] <... wait4 resumed> 0xbfffeef8, 0, NULL) = ? ERESTARTSYS (To be
restarted)
[pid  9897] <... nanosleep resumed> 0)  = -1 EINTR (Interrupted system call)
[pid  9895] --- SIGINT (Interrupt) @ 0 (0) ---
[pid  9896] --- SIGINT (Interrupt) @ 0 (0) ---
[pid  9897] --- SIGINT (Interrupt) @ 0 (0) ---
[pid  9895] sigreturn( <unfinished ...>
[pid  9896] rt_sigaction(SIGINT, {SIG_DFL},  <unfinished ...>
[pid  9897] gettimeofday( <unfinished ...>
[pid  9895] <... sigreturn resumed> )   = ? (mask now [CHLD RTMIN])
[pid  9896] <... rt_sigaction resumed> {0x8075db0, [], SA_RESTORER, 0x40063438},
8) = 0
[pid  9897] <... gettimeofday resumed> {1045716725, 977581}, NULL) = 0
[pid  9895] wait4(-1,  <unfinished ...>
[pid  9896] rt_sigprocmask(SIG_SETMASK, [RTMIN],  <unfinished ...>
[pid  9897] nanosleep({243, 142386000},  <unfinished ...>
[pid  9896] <... rt_sigprocmask resumed> NULL, 8) = 0
[pid  9896] rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
[pid  9896] exit_group(129)             = ?
[pid  9895] <... wait4 resumed> [WIFEXITED(s) && WEXITSTATUS(s) == 129], 0,
NULL) = 9896
[pid  9895] rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
[pid  9895] --- SIGCHLD (Child exited) @ 0 (0) ---
[pid  9895] wait4(-1, 0xbfffefcc, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid  9895] sigreturn()                 = ? (mask now [RTMIN])
[pid  9895] rt_sigaction(SIGINT, {SIG_DFL}, {0x8075db0, [], SA_RESTORER,
0x40063438}, 8) = 0
[runs C, while sleep keeps on running]

22108 is A, 22109 is B, 22110 is background sleep started by B
[pid 22108] wait4(-1,  <unfinished ...>
[pid 22109] wait4(-1,  <unfinished ...>
[pid 22110] gettimeofday({1045717130, 150180}, NULL) = 0
[pid 22110] nanosleep({280, 444129000},  <unfinished ...>
[pid 22108] <... wait4 resumed> 0xbffff2d8, 0, NULL) = ? ERESTARTSYS (To be
restarted)
[pid 22109] <... wait4 resumed> 0xbffff378, 0, NULL) = ? ERESTARTSYS (To be
restarted)
[pid 22110] <... nanosleep resumed> 0)  = -1 EINTR (Interrupted system call)
[pid 22108] --- SIGINT (Interrupt) @ 0 (0) ---
[pid 22109] --- SIGINT (Interrupt) @ 0 (0) ---
[pid 22110] --- SIGINT (Interrupt) @ 0 (0) ---
[pid 22108] sigreturn( <unfinished ...>
[pid 22109] sigreturn( <unfinished ...>
[pid 22110] gettimeofday( <unfinished ...>
[pid 22108] <... sigreturn resumed> )   = ? (mask now [CHLD RTMIN])
[pid 22109] <... sigreturn resumed> )   = ? (mask now [CHLD RTMIN])
[pid 22110] <... gettimeofday resumed> {1045717136, 886325}, NULL) = 0
[pid 22108] wait4(-1,  <unfinished ...>
[pid 22109] wait4(-1,  <unfinished ...>
[pid 22110] nanosleep({273, 707984000},  <unfinished ...>
[pid 22109] <... wait4 resumed> [WIFSIGNALED(s) && WTERMSIG(s) == SIGINT], 0,
NULL) = 22170
[pid 22109] rt_sigaction(SIGINT, {SIG_DFL}, {0x8075db0, [], SA_RESTORER,
0x40063438}, 8) = 0
[pid 22109] rt_sigaction(SIGINT, {SIG_DFL}, {SIG_DFL}, 8) = 0
[pid 22109] getpid()                    = 22109
[pid 22109] kill(22109, SIGINT)         = 0
[pid 22109] --- SIGINT (Interrupt) @ 0 (0) ---
[pid 22108] <... wait4 resumed> [WIFSIGNALED(s) && WTERMSIG(s) == SIGINT], 0,
NULL) = 22109
[pid 22108] rt_sigaction(SIGINT, {SIG_DFL}, {0x8075db0, [], SA_RESTORER,
0x40063438}, 8) = 0
[pid 22108] rt_sigaction(SIGINT, {SIG_DFL}, {SIG_DFL}, 8) = 0
[pid 22108] getpid()                    = 22108
[pid 22108] kill(22108, SIGINT)         = 0
[pid 22108] --- SIGINT (Interrupt) @ 0 (0) ---
[sleep keeps on running]