Regarding cuserid() function in 'C'


 
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# 1  
Old 07-22-2008
Regarding cuserid() function in 'C'

Hi,

I am doing a (Make gapw), where I have the following line of code at Line No.96 :-

96 DISCARD strcpy(user , (char*) cuserid((char*)0));

But I am not able to compile due to the only 1 following error :-

gapw.c: In function `main':
gapw.c:96: warning: cast to pointer from integer of different size

I included #include <stdlib.h> and #include <libgen.h>, in the file, but still I am not able to compile.

I think, there is a problem with the usage of cuserid() function.

Request you to please help me to debug the error.

Thanks in advance.

Best Regards,
Marconi

Last edited by marconi; 07-22-2008 at 04:59 PM..
# 2  
Old 07-22-2008
What platform are you on?
cuserid() will be removed some time in the future so it is recommended to use its replacements like getpwuid() or getlogin().
# 3  
Old 07-22-2008
Hi,

I am currently on OS :- Red Hat Linux Version 3.0. The script I am running is a HP Tru64 Unix compatible script
which I am trying to run on the Linux Version 3.0.

Instead of :- DISCARD strcpy(user , (char*) cuserid((char*)0));

I used each of the following as per your suggestion :-

DISCARD strcpy(user, (char*) getlogin((char*)0));

or

DISCARD strcpy(user , (char*) getpwuid(getuid((char*)0)));

but still its showing me the following errors :-

$ make gapw
cc -c -o gapw.o gapw.c
gapw.c: In function `main':
gapw.c:101: error: too many arguments to function `getlogin'
make: *** [gapw.o] Error 1

or

$ make gapw
cc -c -o gapw.o gapw.c
gapw.c: In function `main':
gapw.c:102: error: too many arguments to function `getuid'
gapw.c:102: warning: cast to pointer from integer of different size
make: *** [gapw.o] Error 1


Request you to pls give ur inputs.

Regards,
Marconi.

Last edited by marconi; 07-22-2008 at 05:06 PM..
# 4  
Old 07-23-2008
Are you including the required headers for getlogin() and/or getpwuid()?

getlogin() requires <unistd.h>
getpwuid() requires <sys/types.h> and <pwd.h>
# 5  
Old 07-23-2008
corrected syntax for getlogin
Code:
/* top of file */
#include <unistd.h>
/* ..... some of your code here down to line 101 */
strcpy(user , getlogin() );

# 6  
Old 07-24-2008
Hi,

I had already added the 3 header files as suggested by murphy as follows :-

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include "ifile.h"
#include <libgen.h>
#include <stdlib.h>
#include <pwd.h>


The earlier code had cuserid() as follows :-

1) DISCARD strcpy(user , (char*) cuserid((char*)0));

As cuserid() is not a valid function in linux, I can use either getlogin() or getpwuid()

As per Jim's suggestion, if I put the code like this :-

2) DISCARD strcpy(user, getlogin());

I don't have any errors, as follows :-


$ gcc gapw.c
/tmp/cc6K9ODh.o(.text+0x21d): In function `main':
: undefined reference to `getprofilestring'
/tmp/cc6K9ODh.o(.text+0x2ec): In function `main':
: undefined reference to `getprofilestring'
collect2: ld returned 1 exit status

$ make clean
rm -f getkey.o ifile.o bitt.o getkey getapp \
putkey getall getappkeys gapw filetime filetime.o gapw.o bitt \
libExtRelan.so envi envi.o

$ make gapw
cc -c -o gapw.o gapw.c
cc -c -o ifile.o ifile.c
cc -o gapw gapw.o ifile.o -lc_r
/usr/bin/ld: cannot find -lc_r
collect2: ld returned 1 exit status
make: *** [gapw] Error 1

$


But, I think the logic will be changed when we compare the code at 1) and 2), above.

Also, when I do a gcc gapw.c, I still get the above errors, though there are no errors
when I do a make gapw.


Request you to please give your inputs.

Thanks a lot in advance.

Best Regards,
Marconi.
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