I am assuming you wait() in the parent until the execl() command finishes.
this is what struct rusage looks like on hpux - your system may have it set up differently
The two embedded structures ru_utime and ru_stime have time values for user mode and system mode cpu use, respectively.
The RUSAGE_CHILDREN "who" flag returns the usage in child processes - this case the execl() call.
Hi!
I'm writing a C program which gets from the command line a shell command (such as "ls" ) and I should execute it.
My Q is: how can I send a command to the shell?
I know I have to use one of the above functions, but I don't know how to use them.
Thanks
eyal (1 Reply)
Hi,
Is it possible to run a program from my C program using only the full pathname?
for example if I wanna call: "ls", so I whould have to use:
execl("/bin/ls", "ls", NULL);
Is it possible to do this using only:
"/bin/ls"
thanks (1 Reply)
Consider the following scenario
program1:
main()
{
......
execl("path","function",...);
.....
}
function()
{
-----
-------
}
Now i want to include the path of function in execl. How to do this.
should the path be the path of function's executable file. If it so how... (1 Reply)
I want to make simultanous sh commands in an exec command
for example I want to counts the lines in a file
wc -l my file.txt | awk -F" " '{print $1}'` works fine in sh but I want to implement it in a c code
the first part works like this
execl("/usr/bin/wc", "wc", "-l", "myfile.txt",... (1 Reply)
Hi,
we would appreciate if any one answer the below query.
void main()
{
printf(“ I am in main\n”);
execl(“/HOME/source/file2”,” /HOME/source/file2”,1,0);
printf(“after execl\n”);
}
How to step the file2 source code in GDB. (2 Replies)
how to use find command in execl function,
I used:
execl("/usr/bin/find","find","~","-name","filename.c",0); but it shows
find: ~ no file and directory i need to get the path of the file from the home .:wall: (2 Replies)
when execl fails using the command lss, it doesnt go into the next line
execl("/bin/sh", "/bin/sh", "-c", command, NULL);
perror("execl failed"); exit(127);
for some reason the child process just stops and also the parent process also stops
so the line after the line that... (3 Replies)
Hi, I have two programs, one is named "Master" and the other one "slave". What I want to do is , when I execute Master, inside slave will be called by excecl, do some calculations, and send those to the master program... A little example of what I am failing to do:
if ((PID1=fork())==0) { //... (6 Replies)
Hi,
If I write in a c file :
execlp("date","date",NULL);
printf("A\n");
And then run through the terminal would "A" be printed ?
I understood that execlp will exit the program after it finished so the next lines of code won`t be executed afterwards.. Is that true ? (1 Reply)
Discussion started by: uniran
1 Replies
LEARN ABOUT SUNOS
varargs
varargs(3EXT) Extended Library Functions varargs(3EXT)NAME
varargs - handle variable argument list
SYNOPSIS
#include <varargs.h>
va_alist
va_dcl
va_list pvar;
void va_start(va_listpvar);
type va_arg(va_list pvar, type);
void va_end(va_list pvar);
DESCRIPTION
This set of macros allows portable procedures that accept variable argument lists to be written. Routines that have variable argument lists
(such as printf(3C)) but do not use varargs are inherently non-portable, as different machines use different argument-passing conventions.
va_alist is used as the parameter list in a function header.
va_dcl is a declaration for va_alist. No semicolon should follow va_dcl.
va_list is a type defined for the variable used to traverse the list.
va_start is called to initialize pvar to the beginning of the list.
va_arg will return the next argument in the list pointed to by pvar. type is the type the argument is expected to be. Different types can
be mixed, but it is up to the routine to know what type of argument is expected, as it cannot be determined at runtime.
va_end is used to clean up.
Multiple traversals, each bracketed by va_start and va_end, are possible.
EXAMPLES
Example 1: A sample program.
This example is a possible implementation of execl (see exec(2) ).
#include <unistd.h>
#include <varargs.h>
#define MAXARGS 100
/* execl is called by
execl(file, arg1, arg2, ..., (char *)0);
*/
execl(va_alist)
va_dcl
{
va_list ap;
char *file;
char *args[MAXARGS]; /* assumed big enough*/
int argno = 0;
va_start(ap);
file = va_arg(ap, char *);
while ((args[argno++] = va_arg(ap, char *)) != 0)
;
va_end(ap);
return execv(file, args);
}
SEE ALSO exec(2), printf(3C), vprintf(3C), stdarg(3EXT)NOTES
It is up to the calling routine to specify in some manner how many arguments there are, since it is not always possible to determine the
number of arguments from the stack frame. For example, execl is passed a zero pointer to signal the end of the list. printf can tell how
many arguments are there by the format.
It is non-portable to specify a second argument of char, short, or float to va_arg, since arguments seen by the called function are not
char, short, or float. C converts char and short arguments to int and converts float arguments to double before passing them to a function.
stdarg is the preferred interface.
SunOS 5.10 10 May 2002 varargs(3EXT)