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- SSSSIIIIGGGGWWWWAAAAIIIITTTT((((3333)))) SSSSIIIIGGGGWWWWAAAAIIIITTTT((((3333))))
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- NNNNAAAAMMMMEEEE
- sigwait, sigwaitinfo, sigtimedwait - wait for queued signals (POSIX)
-
- CCCC SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ####iiiinnnncccclllluuuuddddeeee <<<<ssssiiiiggggnnnnaaaallll....hhhh>>>>
- ####iiiinnnncccclllluuuuddddeeee <<<<ssssyyyyssss////ttttiiiimmmmeeeerrrrssss....hhhh>>>>
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- iiiinnnntttt ssssiiiiggggwwwwaaaaiiiitttt((((ccccoooonnnnsssstttt ssssiiiiggggsssseeeetttt____tttt ****sssseeeetttt,,,, iiiinnnntttt ****ssssiiiigggg))));;;;
- iiiinnnntttt ssssiiiiggggwwwwaaaaiiiittttiiiinnnnffffoooo((((ccccoooonnnnsssstttt ssssiiiiggggsssseeeetttt____tttt ****sssseeeetttt,,,, ssssiiiiggggiiiinnnnffffoooo____tttt ****vvvvaaaalllluuuueeee))));;;;
- iiiinnnntttt ssssiiiiggggttttiiiimmmmeeeeddddwwwwaaaaiiiitttt((((ccccoooonnnnsssstttt ssssiiiiggggsssseeeetttt____tttt ****sssseeeetttt,,,, ssssiiiiggggiiiinnnnffffoooo____tttt ****vvvvaaaalllluuuueeee,,,, ttttiiiimmmmeeeessssppppeeeecccc____tttt ****ttttiiiimmmmeeeeoooouuuutttt))));;;;
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The _s_i_g_w_a_i_t() function selects a pending signal from _s_e_t and returns it
- in the storage pointed to by _s_i_g. If multiple signals from _s_e_t are
- pending, then the one with the lowest numerical value is selected. If no
- signals in _s_e_t are pending then the call will block until one becomes
- pending, The signals defined by _s_e_t must be blocked at the time of the
- call to _s_i_g_w_a_i_t() in order to avoid conflicts with installed signal
- handlers. If the signals in _s_e_t are not blocked then the system will
- either deliver the signal asynchronously, or _s_i_g_w_a_i_t() will return with
- the signal. Users are advised to always block signals in _s_e_t to get
- predictable results.
-
- The _s_i_g_w_a_i_t_i_n_f_o() call behaves the same as the _s_i_g_w_a_i_t() call if the
- _v_a_l_u_e argument is NULL. If the _v_a_l_u_e argument is non-NULL, the
- sigwaitinfo() function behaves the same as _s_i_g_w_a_i_t() except the selected
- signal number is stored in the _s_i__s_i_g_n_o member, and the cause of the
- signal is stored in the _s_i__c_o_d_e member. If any value was queued to the
- selected signal, the first such queued value is dequeued and the value is
- stored in the _s_i__v_a_l_u_e member of _v_a_l_u_e. The system resource used to queue
- the signal shall be released and made available to queue other signals.
- If no value is queued, the content of the _s_i__v_a_l_u_e member is undefined.
- If no further signals are queued for the selected signal, the pending
- indication for that signal shall be reset.
-
- The function _s_i_g_t_i_m_e_d_w_a_i_t() behaves the same as _s_i_g_w_a_i_t_i_n_f_o() except that
- if none of the signals specified by _s_e_t are pending, _s_i_g_t_i_m_e_d_w_a_i_t() shall
- wait for the time interval specified in the _t_i_m_e_s_p_e_c structure pointed to
- by _t_i_m_e_o_u_t. If the _t_i_m_e_s_p_e_c structure pointed to by _t_i_m_e_o_u_t is zero-
- valued and if none of the signals specified by _s_e_t are pending, then
- _s_i_g_t_i_m_e_d_w_a_i_t() shall return immediately with an error. If _t_i_m_e_o_u_t is the
- NULL pointer, the behavior is the same as _s_i_g_w_a_i_t_i_n_f_o()
-
- If any realtime signals (those in the range SSSSIIIIGGGGRRRRTTTTMMMMIIIINNNN to SSSSIIIIGGGGRRRRTTTTMMMMAAAAXXXX) are
- pending, the lowest numbered signal shall be returned. The order in
- which realtime and nonrealtime signals are returned is nondeterministic.
- The order in which multiple nonrealtime signals are returned is also
- nondeterministic.
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- PPPPaaaaggggeeee 1111
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- SSSSIIIIGGGGWWWWAAAAIIIITTTT((((3333)))) SSSSIIIIGGGGWWWWAAAAIIIITTTT((((3333))))
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- SEE ALSO
- _kkkk_iiii_llll_llll(2), _ssss_iiii_gggg_aaaa_cccc_tttt_iiii_oooo_nnnn(2), _ssss_iiii_gggg_qqqq_uuuu_eeee_uuuu_eeee(3), _ssss_iiii_gggg_nnnn_aaaa_llll(5), _pppp_tttt_hhhh_rrrr_eeee_aaaa_dddd______ssss_iiii_gggg_mmmm_aaaa_ssss_kkkk(3P).
-
- DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
- Upon successful completion, _s_i_g_w_a_i_t() returns a 0. Otherwise, it returns
- an error number to indicate the error.
-
- Upon successful completion, _s_i_g_w_a_i_t_i_n_f_o() and _s_i_g_t_i_m_e_d_w_a_i_t() return the
- selected signal number. Otherwise, they return a -1 and set _e_r_r_n_o to
- indicate the error number.
-
- If any of the conditions below occur, the error number will take on the
- corresponding value:
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- [EINTR] The wait was interrupted by an unblocked, caught signal.
-
- If any of the following conditions occur, the _s_i_g_w_a_i_t() function shall
- return the corresponding value:
-
- [EINVAL] The _s_e_t argument contains an invalid or unsupported signal
- number.
-
- If any of the following conditions occur, the _s_i_g_t_i_m_e_d_w_a_i_t() function
- shall return -1 and set _e_r_r_n_o to the corresponding value:
-
- [EAGAIN] No signal specified by set was delivered within the
- specified timeout period.
-
- [EINVAL] The _t_i_m_e_o_u_t argument specified a _t_v__n_s_e_c value less than
- zero or greater than or equal to 1 billion.
-
- WWWWAAAARRRRNNNNIIIINNNNGGGG
- The POSIX and System V signal facilities have different semantics. Using
- both facilities in the same program is ssssttttrrrroooonnnnggggllllyyyy ddddiiiissssccccoooouuuurrrraaaaggggeeeedddd and will
- result in unpredictable behavior.
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- PPPPaaaaggggeeee 2222
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