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Top Forums UNIX for Dummies Questions & Answers How can i use fork,sleep,wait and write in a process with father and son..?? Post 302252436 by gumlucin on Wednesday 29th of October 2008 12:05:08 PM
Old 10-29-2008
it must be a program which has written in C (gcc)..This program will use the fork,sleep,wait and write to do the process which i refer up..it must be only about what i refer up,i dont want a big program with many details..
 

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FORK(2) 							System Calls Manual							   FORK(2)

NAME
fork - create a new process SYNOPSIS
#include <sys/types.h> #include <unistd.h> pid_t fork(void) DESCRIPTION
Fork causes creation of a new process. The new process (child process) is an exact copy of the calling process except for the following: The child process has a unique process ID. The child process has a different parent process ID (i.e., the process ID of the parent process). The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the child process can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish standard input and output for newly created processes as well as to set up pipes. The child starts with no pending signals and an inactive alarm timer. RETURN VALUE
Upon successful completion, fork returns a value of 0 to the child process and returns the process ID of the child process to the parent process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to indicate the error. ERRORS
Fork will fail and no child process will be created if one or more of the following are true: [EAGAIN] The system-imposed limit on the total number of processes under execution would be exceeded. This limit is configuration- dependent. (The kernel variable NR_PROCS in <minix/config.h> (Minix), or <minix/const.h> (Minix-vmd).) [ENOMEM] There is insufficient (virtual) memory for the new process. SEE ALSO
execve(2), wait(2). 3rd Berkeley Distribution May 22, 1986 FORK(2)
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