lib/libsys/fork.2

33 .Nd create a new process
45 function causes creation of a new process.
46 The new process (child process) is an exact copy of the
47 calling process (parent process) except for the following:
50 The child process has a unique process ID.
52 The child process has a different parent
53 process ID (i.e., the process ID of the parent process).
55 The child process has its own copy of the parent's descriptors,
58 which are not inherited from the parent process.
63 on a descriptor in the child process can affect a subsequent
80 will not be present in the child process, but remain open in the parent.
82 The child process' resource utilizations
95 function are called as appropriate before fork in the parent process,
98 The child process has only one thread,
99 corresponding to the calling thread in the parent process.
100 If the process has more than one thread,
105 are guaranteed to work in the child process until a call to
116 services in the child process.
122 in the parent process.
130 function creates a new process, similarly to
160 of 0 to the child process and return the process ID of the child
161 process to the parent process.
163 to the parent process, no child process is created, and the global
194 		printf("Hello from child process!\en");
209 	printf("Hello from parent process (child's PID: %d)!\en", pid);
217 Hello from parent process (child's PID: 27804)!
218 Hello from child process!
223 system call will fail and no child process will be created if:
252 There is insufficient swap space for the new process.