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problem with accept() on Fedora 8

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Top Forums Programming problem with accept() on Fedora 8
# 1  
Old 01-11-2008
problem with accept() on Fedora 8
hi,

accept() seems to be still blocking after socket is being closed on our Fedora 8 build. not sure if this is a common problem because i have never experienced this on any other platforms, however i have seen someone else having this issue on Redhat 7 and 9. so is there a socket option fedora is setting differently or anyone know an appropriate method to get that thread out of the accept?

thanks in advance
# 2  
Old 01-11-2008
Post the code section that is problematic or an strace of the process state during the blocking interval after the socket is closed please.
# 3  
Old 01-15-2008
well the code is quite robust so i skip pasting here even pieces of it but i put together a little test where i just spawned a thread which created a socket and called accept. then in the main i waited a few sec and closed the socket and joined the thread. i debugged it and of course it stucked on accept().

Code:
uname({sys="Linux", node="hal9000", ...}) = 0
futex(0x3012adc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
brk(0)                                  = 0x9065000
brk(0x9086000)                          = 0x9086000
clock_gettime(CLOCK_REALTIME, {1200419840, 211248690}) = 0
clock_gettime(CLOCK_REALTIME, {1200419840, 211319847}) = 0
open("/dev/urandom", O_RDONLY)          = 3
fstat64(3, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbffe8bbc) = -1 EINVAL (Invalid argument)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f3a000
read(3, "\310\foW^R\270\212\315\227\323\250\215\275\235z\267\336\263}\261\0\227\261\275\344\302\201\351\226,H"..., 4096) = 4096
close(3)                                = 0
munmap(0xb7f3a000, 4096)                = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f3a000
clock_gettime(CLOCK_REALTIME, {1200419840, 213952202}) = 0
clock_gettime(CLOCK_REALTIME, {1200419840, 214048675}) = 0
clock_gettime(CLOCK_REALTIME, {1200419840, 214158273}) = 0
clock_gettime(CLOCK_REALTIME, {1200419840, 214242900}) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
bind(3, {sa_family=AF_INET, sin_port=htons(6111), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0
ioctl(3, FIONBIO, [0])                  = 0
mmap2(NULL, 10489856, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7524000
mprotect(0xb7524000, 4096, PROT_NONE)   = 0
clone(child_stack=0xb7f244a4, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xb7f24bd8, {entry_number:6, base_addr:0xb7f24b90, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xb7f24bd8) = 19928
clock_gettime(CLOCK_REALTIME, {1200419840, 215085087}) = 0
write(1, "starting..(0 s) [test] started o"..., 44) = 44
nanosleep({3, 0}, {0, 1132736})         = 0
close(3)                                = 0
futex(0xb7f24bd8, FUTEX_WAIT, 19928, NULL) = ? ERESTARTSYS (To be restarted)

i'am pretty sure it's something with fedora cause this software have successfully ran on a whole bunch of various platforms.
# 4  
Old 01-16-2008
After a view of the strace it looks like the block is related to a mutex lock dude.
# 5  
Old 01-16-2008
did you compile it with all warnings turned on? If not, can you. If so did you receive any warnings?
# 6  
Old 01-16-2008
Quote:
Originally Posted by ramen_noodle
After a view of the strace it looks like the block is related to a mutex lock dude.
if you think that cause of the last line, it's cause of joining the thread and the thread stucks cause of its still in the accept() even after the close is called on that socket. i tried this test now on freebsd and redhat 8 too and its running fine there.
# 7  
Old 01-16-2008
Quote:
Originally Posted by frank_rizzo
did you compile it with all warnings turned on? If not, can you. If so did you receive any warnings?
using -Wall -W and besides unused parameters there are no warnings
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