[rrd-users] RRDs::graph and mod_perl

[Philip Molter]

I'm using RRDs with mod_perl on a Solaris 8 box with
Apache/mod_perl and perl 5.6.0.  The call to RRDs::graph is made
with various arguments to print to a file on STDOUT.  RRDs reports
no error, but no graph information is sent to STDOUT.  This process
works fine without mod_perl.  I've attached the part of a truss
output where the problem appears to be occurring.  Any ideas?  I
know I could output to a temporary file, print the contents of the
temporary file, and then unlink the file (how Bronc does it), but
that's extremely inefficient.

Any ideas?

Philip

ps. filenames have been changed to protect the innocent

-----TRUSS OUTPUT-----
# Printing out debug before the graph call begins
10909:  write(2, " -\n - a P N G\n - h   1".., 1140)    = 1140
10909:  write(2, "\n", 1)                               = 1
10909:  time()                                          = 965141926
10909:  time()                                          = 965141926
10909:  time()                                          = 965141926
10909:  open("CPU-cpu.rrd", O_RDONLY)  = 6
10909:  fstat64(6, 0xFFBEE220)                          = 0
10909:  ioctl(6, TCGETA, 0xFFBEE1AC)                    Err#25 ENOTTY
10909:  read(6, " R R D\0 0 0 0 1\0\0\0\0".., 8192)     = 8192
10909:  llseek(6, 0, SEEK_CUR)                          = 8192
10909:  lseek(6, 3569352, SEEK_SET)                     = 3569352
10909:  lseek(6, 196296, SEEK_SET)                      = 196296
10909:  read(6, " @ %A6AE9A06 0F8 @  87BB".., 8192)     = 8192
10909:  read(6, " @11BE z v\b E ` @10FC m".., 8192)     = 8192
10909:  llseek(6, 0xFFFFFFFFFFFFE420, SEEK_CUR)         = 205544
10909:  close(6)                                        = 0
10909:  brk(0x0060B000)                                 = 0
10909:  brk(0x00625800)                                 = 0
10909:  ioctl(1, TCGETA, 0xFFBEDFDC)                    Err#6 ENXIO
10909:  fstat64(1, 0xFFBEE050)                          = 0
10909:  brk(0x00641000)                                 = 0
10909:  brk(0x0065D800)                                 = 0
10909:  write(2, " g r a p h :   W e   p r".., 31)      = 31
10909:  write(2, "\n", 1)                               = 1
# Printing out debug after the graph call finishes

* Philip Molter
* Data Foundry International
* http://www.datafoundry.net/
* philip at datafoundry.net

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