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Full Discussion: Output redirection to exec does not work
Top Forums Shell Programming and Scripting Output redirection to exec does not work Post 302424429 by Gokul Kumar G on Tuesday 25th of May 2010 07:56:33 AM
Old 05-25-2010
Thanks for your response. From the truss output, I see the command is passed to the execve function. In both cases I see errors in the truss output.

Code:
"/usr/bin/cat /opt/CMT/partitions/partition1/a.txt > /opt/CMT/partitions/partition1/b.txt"

/opt/CMT/partitions/partition1$ls /usr/bin/cat
/usr/bin/cat

/opt/CMT/partitions/partition1$ls /opt/CMT/partitions/partition1/a.txt
/opt/CMT/partitions/partition1/a.txt

Truss
--------
28573:  getuid()                                        = 930549 [930549]
28573:  execve("/usr/bin/cat /opt/CMT/partitions/partition1/a.txt > /opt/CMT/partitions/partition1/b.txt", 0x100D02090, 0xFFFFFFFF7FFFFB08) Err#2 ENOENT
28573:  _exit(2)
8231/8:         open("/opt/CMT/partitions/partition1/logs/ContactLog.log", O_RDWR|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 17
8231/8:         fstat(17, 0xFFFFFFFF76DFEFB8)                   = 0
8231/8:         lseek(17, 0, SEEK_CUR)                          = 0


/usr/bin/cat /opt/CMT/partitions/partition1/a.txt > /opt/CMT/partitions/partition1/t.txt

Truss
-----
6320:   execve("/usr/bin/cat", 0x100E29790, 0xFFFFFFFF7FFFFB08)  argc = 4
6320:   resolvepath("/usr/lib/ld.so.1", "/lib/ld.so.1", 1023) = 12
6320:   resolvepath("/usr/bin/cat", "/usr/bin/cat", 1023) = 12
6320:   stat64("/usr/bin/cat", 0xFFBFF8B0)              = 0
6320:   open("/var/ld/ld.config", O_RDONLY)             Err#2 ENOENT
6320:   stat64("/opt/CMT/bin/libc.so.1", 0xFFBFF040) Err#2 ENOENT
6320:   stat64("/opt/oracle/product/10.2.0.3/lib/libc.so.1", 0xFFBFF040) Err#2 ENOENT
6320:   stat64("/opt/teradatav2r6/odbc64/lib/libc.so.1", 0xFFBFF040) Err#2 ENOENT
6320:   stat64("/opt/teradatav2r6/lib64/libc.so.1", 0xFFBFF040) Err#2 ENOENT
6320:   stat64("/lib/libc.so.1", 0xFFBFF040)            = 0
6320:   resolvepath("/lib/libc.so.1", "/lib/libc.so.1", 1023) = 14
6320:   open("/lib/libc.so.1", O_RDONLY)                = 3
6320:   mmap(0x00010000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF3A0000
6320:   mmap(0x00010000, 1294336, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF200000
6320:   mmap(0xFF200000, 1237333, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 3, 0) = 0xFF200000
6320:   mmap(0xFF330000, 35645, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 3, 1245184) =
6320:   mmap(0xFF33A000, 1416, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0xFF33A00
6320:   memcntl(0xFF200000, 145120, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
6320:   close(3)                                        = 0
6320:   mmap(0x00010000, 24576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF3900
6320:   munmap(0xFF3A0000, 32768)                       = 0
6320:   getcontext(0xFFBFF720)
6320:   getrlimit(RLIMIT_STACK, 0xFFBFF700)             = 0
6320:   getpid()                                        = 6320 [867]
6320:   setustack(0xFF392A88)
6320:   mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF3F0000
6320:   brk(0x0002A600)                                 = 0
6320:   brk(0x0002C600)                                 = 0
6320:   stat64("/platform/SUNW,Sun-Fire-15000/lib/libc_psr.so.1", 0xFFBFE670) = 0
6320:   resolvepath("/platform/SUNW,Sun-Fire-15000/lib/libc_psr.so.1", "/platform/sun4u-us3/lib/libc_psr.so.1", 1
6320:   open("/platform/SUNW,Sun-Fire-15000/lib/libc_psr.so.1", O_RDONLY) = 3
6320:   mmap(0x00010000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF3A0000
6320:   munmap(0xFF3A2000, 24576)                       = 0
6320:   close(3)                                        = 0
6320:   stat64("/usr/lib/locale/en_US/en_US.so.3", 0xFFBFE7F8) = 0
6320:   resolvepath("/usr/lib/locale/en_US/en_US.so.3", "/usr/lib/locale/en_US.ISO8859-1/en_US.ISO8859-1.so.3", 1
6320:   open("/usr/lib/locale/en_US/en_US.so.3", O_RDONLY) = 3
6320:   mmap(0x00010000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF380000
6320:   mmap(0x00010000, 90112, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF360000
6320:   mmap(0xFF360000, 16093, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 3, 0) = 0xFF360000
6320:   mmap(0xFF372000, 10158, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 3, 8192) = 0x
6320:   munmap(0xFF364000, 57344)                       = 0
6320:   memcntl(0xFF360000, 6624, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
6320:   close(3)                                        = 0
6320:   stat64("/opt/CMT/bin/libc.so.1", 0xFFBFE6C8) Err#2 ENOENT
6320:   stat64("/opt/oracle/product/10.2.0.3/lib/libc.so.1", 0xFFBFE6C8) Err#2 ENOENT
6320:   stat64("/opt/teradatav2r6/odbc64/lib/libc.so.1", 0xFFBFE6C8) Err#2 ENOENT
6320:   stat64("/opt/teradatav2r6/lib64/libc.so.1", 0xFFBFE6C8) Err#2 ENOENT
6320:   munmap(0xFF380000, 32768)                       = 0
6320:   fstat64(1, 0xFFBFFAF8)                          = 0
6320:   open64("/opt/CMT/partitions/partition1/a.txt", O_RDONLY) = 3
6320:   fstat64(3, 0xFFBFFA60)                          = 0
6320:   llseek(3, 0, SEEK_CUR)                          = 0
6320:   read(3, " S D K F S D F K D S F K".., 8192)     = 94
6320:   write(1, " S D K F S D F K D S F K".., 94)      Err#5 EIO
6320:   open("/usr/lib/locale/en_US/LC_MESSAGES/SUNW_OST_OSCMD.mo", O_RDONLY) Err#2 ENOENT
6320:   fstat64(2, 0xFFBFEAA0)                          = 0
6320:   write(2, " c a t :   o u t p u t  ".., 19)      Err#5 EIO
6320:   open("/usr/lib/locale/en_US/LC_MESSAGES/SUNW_OST_OSLIB.mo", O_RDONLY) Err#2 ENOENT
6320:   write(2, " I / O   e r r o r", 9)               Err#5 EIO
6320:   write(2, "\n", 1)                               Err#5 EIO
6320:   llseek(3, 0, SEEK_CUR)                          = 94
6320:   close(3)                                        = 0
6320:   open64(">", O_RDONLY)                           Err#2 ENOENT
6320:   write(2, " c a t :   c a n n o t  ".., 17)      Err#5 EIO
6320:   open64("/opt/CMT/partitions/partition1/t.txt", O_RDONLY) = 3
6320:   fstat64(3, 0xFFBFFA60)                          = 0
6320:   llseek(3, 0, SEEK_CUR)                          = 0
6320:   read(3, 0x000222A0, 8192)                       = 0
6320:   llseek(3, 0, SEEK_CUR)                          = 0
6320:   close(3)                                        = 0
6320:   close(1)                                        = 0
6320:   _exit(2)

I cannot use eval as the path for eval does not exist. Is there any other alternative to trick the execve function to execute commands with redirections ?

Rgds,
Gokul
Last edited by Scott; 05-25-2010 at 02:46 PM.. Reason: Code tags, please...
 

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