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Full Discussion: warning: int format,pid_t arg (arg 2)
Top Forums Programming warning: int format,pid_t arg (arg 2) Post 302329584 by konvalo on Monday 29th of June 2009 01:04:11 AM
Old 06-29-2009
Question warning: int format,pid_t arg (arg 2)
I try following code under Solaris10,like follows:

Code:
int glob = 6;
int main(void)
{
  int var;
  pid_t pid;
  var = 88;
  printf("before vfork\n");
  if ((pid = vfork()) < 0) {
    err_sys("vfork error");
  } else if (pid == 0) { 
      glob++;
     var++;
     _exit(0);
  }
  printf("pid = %d, glob = %d, var = %d\n", getpid(), glob, var);
  exit(0);
}

When I compile it,it raise following warning
$gcc -Wall abc.c error.obj
abc.c: In function 'main':
abc.c:16: warning: int format,pid_t arg (arg 2)
ld: warning: symbol 'glob' has differing types:
(file /var/tmp//ccIMPxLe.o type=OBJT; file/usr/lib/libc.so type=FUNC);
/var/tmp//ccIMPxLe.o definition take
ld: warning: symbol 'glob' has differing types:
(file /var/tmp//ccIMPxLe.o type=OBJT; file/usr/lib/libc.so type=FUNC);

Why raise above warning? How to correct it?

Thanks in advance
 

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LEARN ABOUT SUNOS

getpgid

getpid(2)							   System Calls 							 getpid(2)

NAME

       getpid, getpgrp, getppid, getpgid - get process, process group, and parent process IDs

SYNOPSIS

       #include <unistd.h>

       pid_t getpid(void);

       pid_t getpgrp(void);

       pid_t getppid(void);

       pid_t getpgid(pid_t pid);

DESCRIPTION

       The getpid() function returns the process ID of the calling process.

       The getpgrp() function returns the process group ID of the calling process.

       The getppid() function returns the parent process ID of the calling process.

       The getpgid() function returns the process group ID of the process whose process ID is equal to pid, or the process group ID of the calling
       process, if pid is equal to 0.

RETURN VALUES

       Upon successful completion, these functions return the process group ID. Otherwise, getpgid() returns (pid_t)-1 and sets errno to  indicate
       the error.

ERRORS

       The getpgid() function will fail if:

       EPERM	       The  process  whose  process   ID is equal to pid is not in the same session as the calling process, and the implementation
		       does not allow access to the process group ID of that process from the calling process.

       ESRCH	       There is no process with a process ID equal to pid.

       The getpgid() function may fail if:

       EINVAL	       The value of the pid argument is invalid.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       intro(2), exec(2), fork(2), getsid(2), setpgid(2), setpgrp(2), setsid(2), signal(3C), attributes(5), standards(5)

SunOS 5.10							    28 Dec 1996 							 getpid(2)
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