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Programming
printing ppid,child pid,pid
Post 47045 by a25khan on Sunday 1st of February 2004 11:48:22 PM
02-02-2004
perderabo,
yeah it makes sense that both child and process will execute the 3 staments, giving 6 results.
is the output in order of child,child,child,parent,parent,parent
now can u correct me if i m wrong here
0 - is the return int value that is always passed to the child to the child
this one is executed by printf("%d\n",pid);
28873 - is the pid of the child which is contained in the parent
this also executed by printf("%d\n",getpid());
28872 - is the pid of the parent
it is executed by printf("%d\n",getppid());
now running for parent
28873 - is the pid of the child
it is executed by printf("%d\n",pid);
28872 - is the pid of the parent that makes the child here
it is executed by printf("%d\n",getpid());
28086 - is the pid of the shell running this program
it is executed by printf("%d\n",getppid());
arrrrrrrrgh
i am confuuuuuuuused!
Hope i got that right
Sorry i am slow and ask too many questions
yeah it makes sense that both child and process will execute the 3 staments, giving 6 results.
is the output in order of child,child,child,parent,parent,parent
now can u correct me if i m wrong here
0 - is the return int value that is always passed to the child to the child
this one is executed by printf("%d\n",pid);
28873 - is the pid of the child which is contained in the parent
this also executed by printf("%d\n",getpid());
28872 - is the pid of the parent
it is executed by printf("%d\n",getppid());
now running for parent
28873 - is the pid of the child
it is executed by printf("%d\n",pid);
28872 - is the pid of the parent that makes the child here
it is executed by printf("%d\n",getpid());
28086 - is the pid of the shell running this program
it is executed by printf("%d\n",getppid());
arrrrrrrrgh
i am confuuuuuuuused!Hope i got that right
Sorry i am slow and ask too many questions
Last edited by a25khan; 02-02-2004 at 12:57 AM..
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LEARN ABOUT OPENSOLARIS
setpgid
setpgid(2) System Calls setpgid(2) NAME
setpgid - set process group ID SYNOPSIS
#include <sys/types.h> #include <unistd.h> int setpgid(pid_t pid, pid_t pgid); DESCRIPTION
The setpgid() function sets the process group ID of the process with ID pid to pgid. If pgid is equal to pid, the process becomes a process group leader. See Intro(2) for more information on session leaders and process group leaders. If pgid is not equal to pid, the process becomes a member of an existing process group. If pid is equal to 0, the process ID of the calling process is used. If pgid is equal to 0, the process specified by pid becomes a process group leader. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The setpgid() function will fail if: EACCES The pid argument matches the process ID of a child process of the calling process and the child process has successfully executed one of the exec family of functions (see exec(2)). EINVAL The pgid argument is less than (pid_t) 0 or greater than or equal to PID_MAX, or the calling process has a controlling terminal that does not support job control. EPERM The process indicated by the pid argument is a session leader. EPERM The pid argument matches the process ID of a child process of the calling process and the child process is not in the same ses- sion as the calling process. EPERM The pgid argument does not match the process ID of the process indicated by the pid argument, and there is no process with a process group ID that matches pgid in the same session as the calling process. ESRCH The pid argument does not match the process ID of the calling process or of a child process of the calling process. 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), exit(2), fork(2), getpid(2), getsid(2), attributes(5), standards(5) SunOS 5.11 28 Dec 1996 setpgid(2)