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如果 Solaris 中的 write() 系统调用返回 EACCES，这意味着什么？

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如果 Solaris 中的 write() 系统调用返回 EACCES，这意味着什么？

我们的 Bamboo 计划之一遇到了一个奇怪的问题，我们无法“本地”复制（在同一台计算机上，使用同一用户）

复制文件失败。这是一个桁架日志：

error   14-Dec-2018 14:22:44    + truss cp -f TestEnvironment.zip /mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9/ 
error   14-Dec-2018 14:22:44    execve("/usr/bin/cp", 0xFFBFBB8C, 0xFFBFBBA0)  argc = 4
error   14-Dec-2018 14:22:44    sysinfo(SI_MACHINE, "sun4v", 257)       = 6
error   14-Dec-2018 14:22:44    mmap(0x00000000, 32, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF3F0000
error   14-Dec-2018 14:22:44    mmap(0x00000000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF3A0000
error   14-Dec-2018 14:22:44    mmap(0x00000000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF390000
error   14-Dec-2018 14:22:44    memcntl(0xFF3B0000, 17560, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
error   14-Dec-2018 14:22:44    mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0) = 0xFF380000
error   14-Dec-2018 14:22:44    memcntl(0x00010000, 4792, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
error   14-Dec-2018 14:22:44    resolvepath("/usr/lib/ld.so.1", "/lib/ld.so.1", 1023) = 12
error   14-Dec-2018 14:22:44    resolvepath("/usr/bin/cp", "/usr/bin/cp", 1023) = 11
error   14-Dec-2018 14:22:44    stat64("/usr/bin/cp", 0xFFBFB658)       = 0
error   14-Dec-2018 14:22:44    open("/var/ld/ld.config", O_RDONLY)     Err#2 ENOENT
error   14-Dec-2018 14:22:44    stat64("/lib/libc.so.1", 0xFFBFADB8)        = 0
error   14-Dec-2018 14:22:44    resolvepath("/lib/libc.so.1", "/lib/libc.so.1", 1023) = 14
error   14-Dec-2018 14:22:44    open("/lib/libc.so.1", O_RDONLY)        = 3
error   14-Dec-2018 14:22:44    mmap(0x00010000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF370000
error   14-Dec-2018 14:22:44    mmap(0x00010000, 1294336, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF200000
error   14-Dec-2018 14:22:44    mmap(0xFF200000, 1244845, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 3, 0) = 0xFF200000
error   14-Dec-2018 14:22:44    mmap(0xFF330000, 36029, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 3, 1245184) = 0xFF330000
error   14-Dec-2018 14:22:44    mmap(0xFF33A000, 1680, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0xFF33A000
error   14-Dec-2018 14:22:44    munmap(0xFF370000, 32768)           = 0
error   14-Dec-2018 14:22:44    close(3)                    = 0
error   14-Dec-2018 14:22:44    memcntl(0xFF200000, 145936, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
error   14-Dec-2018 14:22:44    mmap(0x00010000, 24576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF370000
error   14-Dec-2018 14:22:44    getcontext(0xFFBFB4C8)
error   14-Dec-2018 14:22:44    getrlimit(RLIMIT_STACK, 0xFFBFB4A8)     = 0
error   14-Dec-2018 14:22:44    getpid()                    = 29644 [29643]
error   14-Dec-2018 14:22:44    setustack(0xFF372A88)
error   14-Dec-2018 14:22:44    issetugid()                 = 0
error   14-Dec-2018 14:22:44    brk(0x000288B0)                 = 0
error   14-Dec-2018 14:22:44    brk(0x0002A8B0)                 = 0
error   14-Dec-2018 14:22:44    stat64("/platform/sun4v/lib/libc_psr.so.1", 0xFFBFA958) = 0
error   14-Dec-2018 14:22:44    resolvepath("/platform/sun4v/lib/libc_psr.so.1", "/platform/sun4v/lib/libc_psr.so.1", 1023) = 33
error   14-Dec-2018 14:22:44    open("/platform/sun4v/lib/libc_psr.so.1", O_RDONLY) = 3
error   14-Dec-2018 14:22:44    mmap(0x00010000, 9244, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF360000
error   14-Dec-2018 14:22:44    munmap(0xFF362000, 1052)            = 0
error   14-Dec-2018 14:22:44    close(3)                    = 0
error   14-Dec-2018 14:22:44    stat64("TestEnvironment.zip", 0x000286C8)   = 0
error   14-Dec-2018 14:22:44    stat64("/lib/libsec.so.1", 0xFFBFA188)      = 0
error   14-Dec-2018 14:22:44    resolvepath("/lib/libsec.so.1", "/lib/libsec.so.1", 1023) = 16
error   14-Dec-2018 14:22:44    open("/lib/libsec.so.1", O_RDONLY)      = 3
error   14-Dec-2018 14:22:44    mmap(0x00010000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF350000
error   14-Dec-2018 14:22:44    mmap(0x00010000, 90112, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF1E0000
error   14-Dec-2018 14:22:44    mmap(0xFF1E0000, 57581, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 3, 0) = 0xFF1E0000
error   14-Dec-2018 14:22:44    mmap(0xFF1F0000, 13281, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 3, 65536) = 0xFF1F0000
error   14-Dec-2018 14:22:44    mmap(0xFF1F4000, 5560, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0xFF1F4000
error   14-Dec-2018 14:22:44    munmap(0xFF350000, 32768)           = 0
error   14-Dec-2018 14:22:44    close(3)                    = 0
error   14-Dec-2018 14:22:44    memcntl(0xFF1E0000, 14232, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
error   14-Dec-2018 14:22:44    stat64("/lib/libavl.so.1", 0xFFBFA0A8)      = 0
error   14-Dec-2018 14:22:44    resolvepath("/lib/libavl.so.1", "/lib/libavl.so.1", 1023) = 16
error   14-Dec-2018 14:22:44    open("/lib/libavl.so.1", O_RDONLY)      = 3
error   14-Dec-2018 14:22:44    mmap(0x00010000, 14208, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 3, 0) = 0xFF350000
error   14-Dec-2018 14:22:44    mmap(0x00010000, 81920, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFF1C0000
error   14-Dec-2018 14:22:44    mmap(0xFF1C0000, 3276, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 3, 0) = 0xFF1C0000
error   14-Dec-2018 14:22:44    mmap(0xFF1D2000, 296, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 3, 8192) = 0xFF1D2000
error   14-Dec-2018 14:22:44    munmap(0xFF1C2000, 65536)           = 0
error   14-Dec-2018 14:22:44    munmap(0xFF350000, 14208)           = 0
error   14-Dec-2018 14:22:44    close(3)                    = 0
error   14-Dec-2018 14:22:44    memcntl(0xFF1C0000, 1096, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
error   14-Dec-2018 14:22:44    pathconf("TestEnvironment.zip", _PC_ACL_ENABLED) = 2
error   14-Dec-2018 14:22:44    acl("TestEnvironment.zip", ACE_GETACLCNT, 0, 0x00000000) = 3
error   14-Dec-2018 14:22:44    stat64("TestEnvironment.zip", 0xFFBFABC8)   = 0
error   14-Dec-2018 14:22:44    acl("TestEnvironment.zip", ACE_GETACL, 3, 0x000296C8) = 3
error   14-Dec-2018 14:22:44    stat64("/mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9/", 0x00028630) = 0
error   14-Dec-2018 14:22:44    stat64("/mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9//TestEnvironment.zip", 0x00028630) Err#2 ENOENT
error   14-Dec-2018 14:22:44    open64("TestEnvironment.zip", O_RDONLY)     = 3
error   14-Dec-2018 14:22:44    creat64("/mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9//TestEnvironment.zip", 0777) = 4
error   14-Dec-2018 14:22:44    stat64("/mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9//TestEnvironment.zip", 0x00028630) = 0
error   14-Dec-2018 14:22:44    fstat64(3, 0x000286C8)              = 0
error   14-Dec-2018 14:22:44    mmap64(0x00000000, 8388608, PROT_READ, MAP_SHARED, 3, 0) = 0xFE800000
error   14-Dec-2018 14:22:44    write(4, " P K030414\0\b\b\b\0 \ q".., 8388608) = 8388608
error   14-Dec-2018 14:22:44    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 8388608) = 0xFE800000
error   14-Dec-2018 14:22:44    write(4, "DB ZB8FF [E2F7 kF1FB9BC0".., 8388608) = 8388608
error   14-Dec-2018 14:22:44    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x01000000) = 0xFE800000
error   14-Dec-2018 14:22:44    write(4, " W U \CC gF3 )94 ( R 08C".., 8388608) = 8388608
error   14-Dec-2018 14:22:44    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x01800000) = 0xFE800000
error   14-Dec-2018 14:22:44    write(4, " $EF K v1796 % _A8 X zCD".., 8388608) = 8388608
error   14-Dec-2018 14:22:44    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x02000000) = 0xFE800000
error   14-Dec-2018 14:22:45    write(4, "01 j9482 3E791 )02B9DBAD".., 8388608) = 8388608
error   14-Dec-2018 14:22:45    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x02800000) = 0xFE800000
error   14-Dec-2018 14:22:45    write(4, "FC w &CE02B2E3 ,1DF9 }8E".., 8388608) = 8388608
error   14-Dec-2018 14:22:45    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x03000000) = 0xFE800000
error   14-Dec-2018 14:22:45    write(4, "01FE zAFD60FF9B7B0 * kAA".., 8388608) = 8388608
error   14-Dec-2018 14:22:45    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x03800000) = 0xFE800000
error   14-Dec-2018 14:22:45    write(4, "B712 Z8D81E4C6F515C3D0F1".., 8388608) = 8388608
error   14-Dec-2018 14:22:45    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x04000000) = 0xFE800000
error   14-Dec-2018 14:22:46    write(4, "9A j97AB `0FC0C8 ]E1 )C5".., 8388608) = 8388608
error   14-Dec-2018 14:22:46    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x04800000) = 0xFE800000
error   14-Dec-2018 14:22:46    write(4, "1283 z1282DE 60498DB FEF".., 8388608) = 8388608
error   14-Dec-2018 14:22:46    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x05000000) = 0xFE800000
error   14-Dec-2018 14:22:46    write(4, "FC8CDBDCEC (CD93 j9A 61A".., 8388608) = 8388608
error   14-Dec-2018 14:22:46    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x05800000) = 0xFE800000
error   14-Dec-2018 14:22:46    write(4, "8ECC 6BB U93 ~E5B4A2CF g".., 8388608) = 8388608
error   14-Dec-2018 14:22:46    mmap64(0xFE800000, 8388608, PROT_READ, MAP_SHARED|MAP_FIXED, 3, 0x06000000) = 0xFE800000
error   14-Dec-2018 14:22:46    write(4, "AD 7BFE9E7F0EFE51686F2 9".., 8388608) Err#13 EACCES
error   14-Dec-2018 14:22:46    brk(0x0002A8B0)                 = 0
error   14-Dec-2018 14:22:46    brk(0x0002C8B0)                 = 0
error   14-Dec-2018 14:22:46    open("/usr/dt/lib/nls/msg/C/SUNW_OST_OSLIB.cat", O_RDONLY) Err#2 ENOENT
error   14-Dec-2018 14:22:46    open("/usr/lib/locale/C/LC_MESSAGES/SUNW_OST_OSLIB.mo", O_RDONLY) Err#2 ENOENT
error   14-Dec-2018 14:22:46    cp: TestEnvironment.zipwrite(2, " c p :   T e s t E n v i".., 23)   = 23
error   14-Dec-2018 14:22:46    : write(2, " :  ", 2)               = 2
error   14-Dec-2018 14:22:46    Permission deniedwrite(2, " P e r m i s s i o n   d".., 17) = 17
error   14-Dec-2018 14:22:46    
error   14-Dec-2018 14:22:46    write(2, "\n", 1)               = 1
error   14-Dec-2018 14:22:46    close(3)                    = 0
error   14-Dec-2018 14:22:47    close(4)                    = 0
error   14-Dec-2018 14:22:47    munmap(0xFE800000, 8388608)         = 0
error   14-Dec-2018 14:22:47    unlink("/mnt/builds/SEN/Touchstone/Maintenance/10.1/solaris10sparc/gcc4_9//TestEnvironment.zip") = 0
error   14-Dec-2018 14:22:47    _exit(2)

前面的命令cp -f TestEnvironment.zip /mnt/builds/SEN/Touchstone/Maintenance/10.1/Solaris_sparc_gcc/也会成功。

-bash-3.2$ uname -a
SunOS b2s-sol10spr-4 5.10 Generic_147440-01 sun4v sparc sun4v

所以，我去了https://docs.oracle.com/cd/E26502_01/html/E29032/write-2.html，而且没有提到EACCES...

这是怎么回事？

答案1

你没有发送你的源代码，但似乎你调用mmap()来获取你喜欢写的数据。

我猜想您映射了一个文件区域，该区域不授予您读取访问权限。

为了验证问题不是由副作用引起的，mmap()您应该致电

dd if=filename of=/dev/null

当您确实只从源文件读取时检查是否存在问题。

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