problem with accept() on Fedora 8 Post: 302158472

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Top Forums Programming problem with accept() on Fedora 8 Post 302158472 by Akimaki on Tuesday 15th of January 2008 12:06:08 PM

01-15-2008

Registered User

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.

Akimaki

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LEARN ABOUT LINUX

mmap64

MMAP2(2)						     Linux Programmer's Manual							  MMAP2(2)

NAME

       mmap2 - map files or devices into memory

SYNOPSIS

       #include <sys/mman.h>

       void *mmap2(void *addr, size_t length, int prot,
		    int flags, int fd, off_t pgoffset);

DESCRIPTION

       The  mmap2()  system call operates in exactly the same way as mmap(2), except that the final argument specifies the offset into the file in
       4096-byte units (instead of bytes, as is done by mmap(2)).  This enables applications that use a 32-bit off_t to map  large  files  (up	to
       2^44 bytes).

RETURN VALUE

       On success, mmap2() returns a pointer to the mapped area.  On error -1 is returned and errno is set appropriately.

ERRORS

       EFAULT Problem with getting the data from userspace.

       EINVAL (Various platforms where the page size is not 4096 bytes.)  offset * 4096 is not a multiple of the system page size.

       mmap2() can return any of the same errors as mmap(2).

VERSIONS

       mmap2() is available since Linux 2.3.31.

CONFORMING TO

       This system call is Linux-specific.

NOTES

       Nowadays, the glibc mmap() wrapper function invokes this system call rather than the mmap(2) system call.

       On ia64, the unit for offset is actually the system page size, rather than 4096 bytes.

SEE ALSO

       getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-04-22								  MMAP2(2)

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