Kbase P113440: What is UNIX truss command?
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
16/10/2008 |
|
Status: Unverified
GOAL:
What is UNIX truss command?
GOAL:
How can the UNIX truss command help debugging?
FIX:
There are many instances when a program freezes of otherwise fails to work and few clues are given as to the problem.
The UNIX truss command under Solaris is essential for debugging many system problems as it displays each system call a process performs and the arguments passed.
Here is an example of running truss under Solaris to trace all the system calls made by the command "ls":
solaris% truss ls
execve("/usr/bin/ls", 0xEFFFFD20, 0xEFFFFD28) argc = 1
open("/dev/zero", O_RDONLY) = 3
mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xEF7C0000
open("/usr/lib/libw.so.1", O_RDONLY) = 4
fstat(4, 0xEFFFF9D4) = 0
mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_SHARED, 4, 0) = 0xEF7B0000
mmap(0x00000000, 98304, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF790000
munmap(0xEF798000, 57344) = 0
mmap(0xEF7A6000, 3512, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 24576) = 0xEF7A6000
close(4) = 0
open("/usr/lib/libintl.so.1", O_RDONLY) = 4
fstat(4, 0xEFFFF9D4) = 0
mmap(0xEF7B0000, 8192, PROT_READ|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = 0xEF7B0000
mmap(0x00000000, 81920, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF770000
munmap(0xEF774000, 57344) = 0
mmap(0xEF782000, 3040, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 8192) = 0xEF782000
close(4) = 0
open("/usr/lib/libc.so.1", O_RDONLY) = 4
fstat(4, 0xEFFFF9D4) = 0
mmap(0xEF7B0000, 8192, PROT_READ|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = 0xEF7B0000
mmap(0x00000000, 622592, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF680000
munmap(0xEF700000, 57344) = 0
mmap(0xEF70E000, 29088, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 516096) = 0xEF70E000
mmap(0xEF716000, 5104, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xEF716000
close(4) = 0
open("/usr/lib/libdl.so.1", O_RDONLY) = 4
fstat(4, 0xEFFFF9D4) = 0
mmap(0xEF7B0000, 8192, PROT_READ|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4, 0) = 0xEF7B0000
close(4) = 0
open("/usr/platform/SUNW,Ultra-2/lib/libc_psr.so.1", O_RDONLY) = 4
fstat(4, 0xEFFFF834) = 0
mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_SHARED, 4, 0) = 0xEF760000
mmap(0x00000000, 81920, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF740000
munmap(0xEF744000, 57344) = 0
mmap(0xEF752000, 5440, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 8192) = 0xEF752000
close(4) = 0
close(3) = 0
munmap(0xEF760000, 8192) = 0
time() = 932140546
ioctl(1, TCGETA, 0xEFFFFC4C) Err#25 ENOTTY
brk(0x000244E8) = 0
brk(0x000264E8) = 0
brk(0x000264E8) = 0
brk(0x0002E4E8) = 0
lstat(".", 0xEFFFFBD8) = 0
open(".", O_RDONLY|O_NDELAY) = 3
fcntl(3, F_SETFD, 0x00000001) = 0
fstat(3, 0xEFFFFB18) = 0
getdents(3, 0x0002D110, 1048) = 368
getdents(3, 0x0002D110, 1048) = 0
close(3) = 0
ioctl(1, TCGETA, 0xEFFFDE2C) Err#25 ENOTTY
fstat(1, 0xEFFFDEA0) = 0
brk(0x0002E4E8) = 0
brk(0x000304E8) = 0
lseek(0, 0, SEEK_CUR) = 91149
AWK.html
GREP.html
RCS
SED.html
dd.html
index.html
lsof.html
od.html
pipe.html
regexp.html
sevregexp
su.html
sudo.html
truss.html
truss.html.swp
truss.html~
write(1, " A W K . h t m l\n G R E".., 157) = 157
_exit(0)