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[comment][libc] add some comments for functions in posix_signal #7647

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merged 2 commits into from
Jun 10, 2023
Merged

[comment][libc] add some comments for functions in posix_signal #7647

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310b5a8
add the comment of function sigsuspend, sigtimedwait, sigwait, sigwai…
ddAkira Jun 9, 2023
3b6e9ad
use formatting to complie with the code specification
ddAkira Jun 10, 2023
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49 changes: 43 additions & 6 deletions components/libc/posix/signal/posix_signal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,6 @@ void (*signal(int sig, void (*func)(int))) (int)
*
* @return Returns 0 on success.
*/

int sigprocmask (int how, const sigset_t *set, sigset_t *oset)
{
rt_base_t level;
Expand Down Expand Up @@ -90,7 +89,16 @@ int sigpending (sigset_t *set)
sigprocmask(SIG_SETMASK, RT_NULL, set);
return 0;
}

/**
* @brief This function will temporarily replace the signal mask of the calling thread
* with the mask given and then suspends the thread until delivery of an expected signal
* or a signal whose action is to terminate a process.
*
* @param set is a pointer of a sigset_t object that is used to replace the original mask of the calling thread.
*
* @return Returns 0 on success.
* If the return value is any other values, it means that the signal wait failed.
*/
int sigsuspend (const sigset_t *set)
{
int ret = 0;
Expand Down Expand Up @@ -125,7 +133,6 @@ int sigsuspend (const sigset_t *set)
*
* @return Returns 0 on success or -1 on failure.
*/

int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
{
rt_sighandler_t old = RT_NULL;
Expand All @@ -145,7 +152,19 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)

return 0;
}

/**
* @brief This function will suspends execution of the calling thread until one of
* the signals in the given set is pending. If none of the signals specified
* are pending, it will wait for the specified time interval.
*
* @param set is the set of signal values to be waited for.
*
* @param info is a pointer to the received signal info.
*
* @param timeout is a pointer to a timespec structure that specifys the waiting time.
*
* @return Return 0 on success. Otherwise, return -1 and set errno to indicate the error.
*/
int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout)
{
int ret = 0;
Expand All @@ -162,7 +181,16 @@ int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *ti
errno = ret;
return -1;
}

/**
* @brief This function will suspend execution of the calling thread until one of
* the specified signal becomes pending and return the signal number.
*
* @param set is the set of signal values to be waited for.
*
* @param sig is a pointer to the received signal number.
*
* @return Return 0 on success or -1 on failure.
*/
int sigwait(const sigset_t *set, int *sig)
{
siginfo_t si;
Expand All @@ -172,7 +200,16 @@ int sigwait(const sigset_t *set, int *sig)
*sig = si.si_signo;
return 0;
}

/**
* @brief This function will suspend execution of the calling thread until one of
* the specified signal is pending.
*
* @param set is the set of signal values to be waited for.
*
* @param info is a pointer to the received signal info.
*
* @return Return 0 on success or -1 on failure.
*/
int sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
return sigtimedwait(set, info, NULL);
Expand Down