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Full Discussion: cron/logrotate chicken and egg problem
Top Forums UNIX for Advanced & Expert Users cron/logrotate chicken and egg problem Post 302236924 by jjinno on Tuesday 16th of September 2008 02:59:22 PM
Old 09-16-2008
The results are in...
I did a comparative strace between a fully functioning system and a system with cron failure. The basics are the same...

A poling loop for config changes (repeated every minute):
Code:
stat("cron", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/etc/cron.d", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/etc/crontab", {st_mode=S_IFREG|0644, st_size=255, ...}) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {0x555555557772, [], SA_RESTORER|SA_RESTART, 0x2aaaaae0a460}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({60, 0}, {60, 0})             = 0

After some reads to /etc/localtime (for logging) and a message send, the first /var interaction... connecting to a socket:
Code:
[pid 24735] socket(PF_FILE, SOCK_STREAM, 0) = 3
[pid 24735] fcntl(3, F_GETFL)           = 0x2 (flags O_RDWR)
[pid 24735] fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 24735] connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
[pid 24735] close(3)                    = 0

Blah, blah, blah, some different libraries, a look at resolv.conf, and finally, the moment we have all been waiting for:
Code:
[pid 24735] socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
[pid 24735] connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.20.30.40")}, 28) = 0
[pid 24735] fcntl(3, F_GETFL)           = 0x2 (flags O_RDWR)
[pid 24735] fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 24735] poll([{fd=3, events=POLLOUT, revents=POLLOUT}], 1, 0) = 1
[pid 24735] sendto(3, "\377\276\1\0\0\1\0\0\0\0\0\0\7babylon5\7skynet\5loc"..., 39, MSG_NOSIGNAL, NULL, 0) = 39
[pid 24735] poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
[pid 24735] ioctl(3, FIONREAD, [111])   = 0
[pid 24735] recvfrom(3, "\377\276\205\203\0\1\0\0\0\1\0\0\7babylon5\7skynet\5lo"..., 1024, 0, {sa_family=AF_INET, \
sin_port=htons(53), sin_addr=inet_addr("10.20.30.40")}, [16]) = 111
[pid 24735] writev(2, [{"crond", 5}, {": ", 2}, {"relocation error", 16}, {": ", 2}, {"/lib64/libresolv.so.2", 21}, {": ", 2}, \
{"symbol __res_iclose, version GLI"..., 97}, {"", 0}, {"", 0}, {"\n", 1}], 10 <unfinished ...>
[pid 24734] <... read resumed> "crond: relocation error: /lib64/"..., 4096) = 146
[pid 24735] <... writev resumed> )      = 146
[pid 24734] uname( <unfinished ...>
[pid 24735] exit_group(127)             = ?
Process 24735 detached

It does this once more, and then exits (on a Interrupted System Call) to resume the nanosleep loop...

Now, almost everything (except the error) is identical between the good and bad strace. The return code for the last recvfrom() is 91 on the good server, and 111 on the bad... also the sendto() returns 43 on the good server, and 39 on the bad...
 

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LEARN ABOUT OPENSOLARIS

sched_getscheduler

sched_getscheduler(3C)					   Standard C Library Functions 				    sched_getscheduler(3C)

NAME

       sched_getscheduler - get scheduling policy

SYNOPSIS

       #include <sched.h>

       int sched_getscheduler(pid_t pid);

DESCRIPTION

       The  sched_getscheduler()  function  returns  the  scheduling  policy of the process specified by pid. If the value of pid is negative, the
       behavior of the sched_getscheduler() function is unspecified.

       The values that can be returned by sched_getscheduler() are defined in the header <sched.h> and	described  on  the  sched_setscheduler(3C)
       manual page.

       If  a  process  specified  by  pid exists and if the calling process has permission, the scheduling policy will be returned for the process
       whose process ID is equal to pid.

       If pid is 0, the scheduling policy will be returned for the calling process.

RETURN VALUES

       Upon successful completion, the sched_getscheduler() function returns the scheduling policy of the specified process. If unsuccessful,  the
       function returns -1 and sets errno to indicate the error.

ERRORS

       The  sched_getscheduler() function will fail if:

       EPERM	The requesting process does not have permission to determine the scheduling policy of the specified process.

       ESRCH	No process can be found corresponding to that specified by pid.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |ATTRIBUTE TYPE		     |ATTRIBUTE VALUE		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       librt(3LIB), sched.h(3HEAD), sched_getparam(3C), sched_setparam(3C), sched_setscheduler(3C), attributes(5), standards(5)

SunOS 5.11							    1 Apr 2008						    sched_getscheduler(3C)
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