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47 .TH GETPID 2 "Jan 27, 2009"
49 getpid, getpgrp, getppid, getpgid \- get process, process group, and parent
56 \fBpid_t\fR \fBgetpid\fR(\fBvoid\fR);
61 \fBpid_t\fR \fBgetpgrp\fR(\fBvoid\fR);
66 \fBpid_t\fR \fBgetppid\fR(\fBvoid\fR);
71 \fBpid_t\fR \fBgetpgid\fR(\fBpid_t\fR \fIpid\fR);
77 The \fBgetpid()\fR function returns the process \fBID\fR of the calling
81 The \fBgetpgrp()\fR function returns the process group \fBID\fR of the calling
85 The \fBgetppid()\fR function returns the parent process \fBID\fR of the calling
89 The \fBgetpgid()\fR function returns the process group \fBID\fR of the process
90 whose process \fBID\fR is equal to \fIpid,\fR or the process group \fBID\fR of
91 the calling process, if \fIpid\fR is equal to 0.
95 The \fBgetpid()\fR, \fBgetpgrp()\fR, and \fBgetppid()\fR functions are always
96 successful and no return value is reserved to indicate an error.
99 Upon successful completion, \fBgetpgid()\fR returns the process group ID.
100 Otherwise, \fBgetpgid()\fR returns \fB(pid_t)\(mi1\fR and sets \fBerrno\fR to
105 The \fBgetpgid()\fR function will fail if:
112 The process whose process \fBID\fR is equal to \fIpid\fR is not in the same
113 session as the calling process, and the implementation does not allow access to
114 the process group \fBID\fR of that process from the calling process.
123 There is no process with a process \fBID\fR equal to \fIpid\fR.
128 The \fBgetpgid()\fR function may fail if:
135 The value of the \fIpid\fR argument is invalid.
141 See \fBattributes\fR(5) for descriptions of the following attributes:
149 ATTRIBUTE TYPE ATTRIBUTE VALUE
151 Interface Stability Committed
153 MT-Level Async-Signal-Safe
155 Standard See \fBstandards\fR(5).
161 \fBIntro\fR(2), \fBexec\fR(2), \fBfork\fR(2), \fBgetsid\fR(2),
162 \fBsetpgid\fR(2), \fBsetpgrp\fR(2), \fBsetsid\fR(2), \fBsignal\fR(3C),
163 \fBattributes\fR(5), \fBstandards\fR(5)