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Full Discussion: Tracing a function call
Top Forums Shell Programming and Scripting Tracing a function call Post 302405700 by steadyonabix on Friday 19th of March 2010 03:27:42 PM
Old 03-19-2010
Tracing a function call

Hi

I am hoping someone can explain this to me as I am struggling to understand it.

I had a problem today with needing to trace a ksh script that was dotting in a function that was writing to stdout. The problem was it was being run in a sub shell and the output was being parsed by the calling script so I could not have any trace output on stdout.

On a hunch I tried this solution to log the function's trace to file and it worked but I don't know why, can anyone enlighten me?

The code: -

Code:
TX5XN:/home/brad/ksh_stuff>cat trace_2

func()
{
    set -x
    echo "This goes to stdout from func"
    set +x
    echo "=============================" >&2
} 2>> set.log2

echo "This goes to stdout from main body"

for x in 1 2 3 4 5
do
    func
done

The output to stdout: -

Code:
TX5XN:/home/brad/ksh_stuff> trace_2  
This goes to stdout from main body
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func

The trace log: -

Code:
TX5XN:/home/brad/ksh_stuff>cat set.log2
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================

 

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hx509 printing functions(3)					Heimdalx509library				       hx509 printing functions(3)

NAME
hx509 printing functions - Functions void hx509_print_stdout (void *ctx, const char *fmt, va_list va) int hx509_oid_sprint (const heim_oid *oid, char **str) void hx509_oid_print (const heim_oid *oid, hx509_vprint_func func, void *ctx) void hx509_bitstring_print (const heim_bit_string *b, hx509_vprint_func func, void *ctx) int hx509_cert_keyusage_print (hx509_context context, hx509_cert c, char **s) int hx509_validate_ctx_init (hx509_context context, hx509_validate_ctx *ctx) void hx509_validate_ctx_set_print (hx509_validate_ctx ctx, hx509_vprint_func func, void *c) void hx509_validate_ctx_add_flags (hx509_validate_ctx ctx, int flags) void hx509_validate_ctx_free (hx509_validate_ctx ctx) int hx509_validate_cert (hx509_context context, hx509_validate_ctx ctx, hx509_cert cert) Detailed Description Function Documentation void hx509_bitstring_print (const heim_bit_string * b, hx509_vprint_func func, void * ctx) Print a bitstring using a hx509_vprint_func function. To print to stdout use hx509_print_stdout(). Parameters: b bit string to print. func hx509_vprint_func to print with. ctx context variable to hx509_vprint_func function. int hx509_cert_keyusage_print (hx509_context context, hx509_cert c, char ** s) Print certificate usage for a certificate to a string. Parameters: context A hx509 context. c a certificate print the keyusage for. s the return string with the keysage printed in to, free with hx509_xfree(). Returns: An hx509 error code, see hx509_get_error_string(). void hx509_oid_print (const heim_oid * oid, hx509_vprint_func func, void * ctx) Print a oid using a hx509_vprint_func function. To print to stdout use hx509_print_stdout(). Parameters: oid oid to print func hx509_vprint_func to print with. ctx context variable to hx509_vprint_func function. int hx509_oid_sprint (const heim_oid * oid, char ** str) Print a oid to a string. Parameters: oid oid to print str allocated string, free with hx509_xfree(). Returns: An hx509 error code, see hx509_get_error_string(). void hx509_print_stdout (void * ctx, const char * fmt, va_list va) Helper function to print on stdout for: o hx509_oid_print(), o hx509_bitstring_print(), o hx509_validate_ctx_set_print(). Parameters: ctx the context to the print function. If the ctx is NULL, stdout is used. fmt the printing format. va the argumet list. int hx509_validate_cert (hx509_context context, hx509_validate_ctx ctx, hx509_cert cert) Validate/Print the status of the certificate. Parameters: context A hx509 context. ctx A hx509 validation context. cert the cerificate to validate/print. Returns: An hx509 error code, see hx509_get_error_string(). void hx509_validate_ctx_add_flags (hx509_validate_ctx ctx, int flags) Add flags to control the behaivor of the hx509_validate_cert() function. Parameters: ctx A hx509 validation context. flags flags to add to the validation context. Returns: An hx509 error code, see hx509_get_error_string(). void hx509_validate_ctx_free (hx509_validate_ctx ctx) Free an hx509 validate context. Parameters: ctx the hx509 validate context to free. int hx509_validate_ctx_init (hx509_context context, hx509_validate_ctx * ctx) Allocate a hx509 validation/printing context. Parameters: context A hx509 context. ctx a new allocated hx509 validation context, free with hx509_validate_ctx_free(). Returns: An hx509 error code, see hx509_get_error_string(). void hx509_validate_ctx_set_print (hx509_validate_ctx ctx, hx509_vprint_func func, void * c) Set the printing functions for the validation context. Parameters: ctx a hx509 valication context. func the printing function to usea. c the context variable to the printing function. Returns: An hx509 error code, see hx509_get_error_string(). Version 1.5.2 11 Jan 2012 hx509 printing functions(3)
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