openSUSE Programming January 2009

programming@lists.opensuse.org

5 participants
4 discussions

[opensuse-programming] Getting PID by process-name

by Volker Poplawski

Hi all. How do i get the PID of a process by the process-name? I'm looking for the same thing pgrep does, but as a C-function. Regards .....Volker -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

12 years, 3 months

[opensuse-programming] Re: [opensuse] build errors for mutt for SLED 10

by Philipp Thomas

* Patrick Shanahan (paka(a)opensuse.org) [20090108 01:01]: > Trying to rebuild the rpm, mutt-1.5.17-54.1.src.rpm, for SLED 10/ > openSUSE 10.1 on x86_64, I get the following error: > > In file included from /usr/include/idna.h:31, > from mutt_idna.h:26, > from addrbook.c:28: > /usr/include/idn-int.h:47:26: error: no include path in which to search for stdint.h How are you rebuilding the rpm? Simply by calling rpmbuild? I don't get that error when using the build script, i.e. when building in a chroot environment. But it seems that you would need to rebuild a plethora of other packages as well :( mutt needs a more recent version of libgpgme which in turn needs a more recent version of gpg2 which again needs fdupes, libassuan-devel, libusb-devel and pth and those packages will very probably need still other packages. I'd give up that endeavor. Philipp -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

12 years, 9 months

[opensuse-programming] tee() and splice()

by Greg Freemyer

Just came across these new systems calls. (as of 2.6.17). They allow data to very efficiently be copied from one file descriptor to another. (ie. they bypass userspace and do the whole thing in the kernel). Very cool for anyone moving lots of data around at very high speed. Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

12 years, 9 months

[opensuse-programming] Is it a bug in the kernel or in my program?

by Torsten Foertsch

Hi, I am the author of the perl module IO::Handle::Record. This module provides also file descriptor passing between processes. The current release on CPAN has worked up to opensuse 11.0 but breaks with 11.1. I don't want to bore you with the details of interfacing perl. So here comes a short verbal description of what happens. One test case creates a socketpair, forks and then passes a big block of data along with 2 file descriptors via sendmsg/recvmsg to the other process. The sending side is in non-blocking mode and uses select() to wait for the file descriptor to become writeable. The receiving side first reads 2 integers to get the number of bytes and the number of file descriptors passed and then reads the rest of the record. As the data block is larger than the kernel buffer the sendmsg will pass only a part and then return EAGAIN. Here is what happens at the sending side. write(2, "--> sending 2 fds at blib/lib/IO"..., 60) = 60 sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0\6\335\335\0\0\0\2\5\7\2\0\1_\220\n\txyzabc123\0\0\0\0\1\0"..., 450021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS {6, 8}}, msg_flags=0}, 0) = 128000 write(2, "--> sending data chunk: controll"..., 92) = 92 munmap(0x7fbf29894000, 450560) = 0 munmap(0x7fbf29902000, 450560) = 0 close(8) = 0 close(6) = 0 brk(0xd15000) = 0xd15000 brk(0xd83000) = 0xd83000 sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 322021}], msg_controllen=0, msg_flags=0}, 0) = -1 EAGAIN (Resource temporarily unavailabl e) write(2, "--> sending data chunk: controll"..., 87) = 87 brk(0xca7000) = 0xca7000 brk(0xd15000) = 0xd15000 munmap(0x7fbf2b957000, 720896) = 0 brk(0xdc5000) = 0xdc5000 select(8, NULL, [5], NULL, NULL) = 1 (out [5]) fstat(5, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0 brk(0xe33000) = 0xe33000 brk(0xea0000) = 0xea0000 sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 322021}], msg_controllen=0, msg_flags=0}, 0) = 112000 write(2, "--> sending data chunk: controll"..., 91) = 91 sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 210021}], msg_controllen=0, msg_flags=0}, 0) = 128000 write(2, "--> sending data chunk: controll"..., 91) = 91 sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 82021}], msg_controllen=0, msg_flags=0}, 0) = 82021 You see there are 5 sendmsg calls but only the first passes descriptors. The 2nd returns then EAGAIN. So far it is correct. The problem is the receiver. There are 11 recvmsg calls. The first 8 of them handle the 128000 bytes chunk that was sent by the first sendmsg, the one that sends the 2 file descriptors. Those 8 syscalls receive 8 bytes, then 31992 bytes (8+31992==32000) and then 6 times 16000 bytes. But all of those calls receive file descriptors! While only the first should. Is that a kernel bug? Or is my program wrong? getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\0\6\335\335\0\0\0\2", 8}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {5, 8}}, msg_flags=0}, 0) = 8 write(2, "==> expecting 1024 fds -- got 8 "..., 86) = 86 fcntl(5, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(5, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(5, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(5, 0, SEEK_CUR) = 0 fstat(5, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(5, F_SETFD, FD_CLOEXEC) = 0 fstat(5, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(8, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(8, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(8, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(8, 0, SEEK_CUR) = 0 fstat(8, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(8, F_SETFD, FD_CLOEXEC) = 0 fstat(8, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 mmap(NULL, 450560, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbf2b999000 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\5\7\2\0\1_\220\n\txyzabc123\0\0\0\0\1\0\0\0\0\1\0\0\0\0"..., 450013}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {11, 14}} , msg_flags=0}, 0) = 31992 write(2, "==> expecting 1024 fds -- got 31"..., 90) = 90 fcntl(11, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(11, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(11, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(11, 0, SEEK_CUR) = 0 fstat(11, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(11, F_SETFD, FD_CLOEXEC) = 0 fstat(11, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(14, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(14, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(14, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(14, 0, SEEK_CUR) = 0 fstat(14, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(14, F_SETFD, FD_CLOEXEC) = 0 fstat(14, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 418021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 15, 16}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(15, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(15, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(15, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(15, 0, SEEK_CUR) = 0 fstat(15, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(15, F_SETFD, FD_CLOEXEC) = 0 fstat(15, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(16, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(16, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(16, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(16, 0, SEEK_CUR) = 0 fstat(16, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(16, F_SETFD, FD_CLOEXEC) = 0 fstat(16, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 402021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 17, 18}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(17, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(17, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(17, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(17, 0, SEEK_CUR) = 0 fstat(17, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(17, F_SETFD, FD_CLOEXEC) = 0 fstat(17, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(18, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(18, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(18, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(18, 0, SEEK_CUR) = 0 fstat(18, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(18, F_SETFD, FD_CLOEXEC) = 0 fstat(18, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 386021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 19, 20}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(19, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(19, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(19, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(19, 0, SEEK_CUR) = 0 fstat(19, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(19, F_SETFD, FD_CLOEXEC) = 0 fstat(19, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(20, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(20, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(20, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(20, 0, SEEK_CUR) = 0 fstat(20, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(20, F_SETFD, FD_CLOEXEC) = 0 fstat(20, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 370021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 21, 22}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(21, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(21, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(21, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(21, 0, SEEK_CUR) = 0 fstat(21, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(21, F_SETFD, FD_CLOEXEC) = 0 fstat(21, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(22, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(22, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(22, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(22, 0, SEEK_CUR) = 0 fstat(22, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(22, F_SETFD, FD_CLOEXEC) = 0 fstat(22, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 354021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 23, 24}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(23, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(23, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(23, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(23, 0, SEEK_CUR) = 0 fstat(23, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(23, F_SETFD, FD_CLOEXEC) = 0 fstat(23, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(24, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(24, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(24, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(24, 0, SEEK_CUR) = 0 fstat(24, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(24, F_SETFD, FD_CLOEXEC) = 0 fstat(24, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 338021}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, { 25, 26}}, msg_flags=0}, 0) = 16000 write(2, "==> expecting 1024 fds -- got 16"..., 90) = 90 fcntl(25, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(25, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 ioctl(25, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(25, 0, SEEK_CUR) = 0 fstat(25, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(25, F_SETFD, FD_CLOEXEC) = 0 fstat(25, {st_mode=S_IFREG|0644, st_size=1405, ...}) = 0 fcntl(26, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(26, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 ioctl(26, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff33b53fc0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(26, 0, SEEK_CUR) = 0 fstat(26, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 fcntl(26, F_SETFD, FD_CLOEXEC) = 0 fstat(26, {st_mode=S_IFREG|0644, st_size=246, ...}) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 322021}], msg_controllen=0, msg_flags=0}, 0) = 112000 write(2, "==> expecting 1024 fds -- got 11"..., 93) = 93 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 210021}], msg_controllen=0, msg_flags=0}, 0) = 128000 write(2, "==> expecting 1024 fds -- got 12"..., 93) = 93 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=8*1024}) = 0 recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0\0\0\0\1\0"..., 82021}], msg_controllen=0, msg_flags=0}, 0) = 82021 write(2, "==> expecting 1024 fds -- got 82"..., 92) = 92 Thanks, Torsten -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

12 years, 9 months

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openSUSE Programming January 2009