truss Command

truss is a new utility, provided to trace system calls performed, signals received, and machine faults incurred. It also has an option that enables entry and exit tracing of user-level function calls executed by the traced process. truss offers several significant improvements over the SunOS release 4 trace(1) command, including the ability to follow forked processes and to deal with multithreaded processes.

Also, the truss utility traces the system calls, signals, and machine faults of a process. It has been enhanced with a new option to enable entry and exit tracing of user-level function calls executed by the traced process.

The following example shows a summary of traced calls for the date command. With the -c option, truss does not display the trace line by line. Instead, it counts the system calls, signals, and faults, and displays a summary.

example% truss -c date
Fri Sep 18 14:31:30 PDT 1992
syscall      seconds   calls  errors
_exit            .00       1
read             .00       7
write            .00       1
open             .03      12
close            .00      12
time             .00       1
brk              .01       4
lseek            .00       1
fstat            .00       4
ioctl            .00       1
execve           .00       1
mmap             .01      17
munmap           .00       8
                ----     ---    ---
sys totals:      .05      70      0
usr time:        .03
elapsed:         .28

See the truss(1) man page for complete details on all truss options. There are a number of other Solaris 7 debugging tools based on proc(4) such as pmap(1).