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Merge branch 'issue-2429' into 'main'

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gspawn: safe_fdwalk/safe_closefrom for Solaris 11.3/11.4

Closes #2429

See merge request GNOME/glib!2203
This commit is contained in:
Philip Withnall 2021-08-02 11:35:55 +00:00
commit 069308ab54
1 changed files with 27 additions and 1 deletions
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28
glib/gspawn.c
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@ -1444,6 +1444,27 @@ safe_fdwalk (int (*cb)(void *data, int fd), void *data)
#endif
#if defined(__sun__) && defined(F_PREVFD) && defined(F_NEXTFD)
/*
* Solaris 11.4 has a signal-safe way which allows
* us to find all file descriptors in a process.
*
* fcntl(fd, F_NEXTFD, maxfd)
* - returns the first allocated file descriptor <= maxfd > fd.
*
* fcntl(fd, F_PREVFD)
* - return highest allocated file descriptor < fd.
*/
open_max = fcntl (INT_MAX, F_PREVFD); /* find the maximum fd */
if (open_max < 0) /* No open files */
return 0;
for (fd = -1; (fd = fcntl (fd, F_NEXTFD, open_max)) != -1; )
if ((res = cb (data, fd)) != 0 || fd == open_max)
break;
#else
#if 0 && defined(HAVE_SYS_RESOURCE_H)
/* Use getrlimit() function provided by the system if it is known to be
* async-signal safe.
@ -1477,6 +1498,7 @@ safe_fdwalk (int (*cb)(void *data, int fd), void *data)
for (fd = 0; fd < open_max; fd++)
if ((res = cb (data, fd)) != 0)
break;
#endif
return res;
#endif
@ -1487,7 +1509,8 @@ safe_fdwalk (int (*cb)(void *data, int fd), void *data)
static void
safe_closefrom (int lowfd)
{
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#if defined(__FreeBSD__) || defined(__OpenBSD__) || \
(defined(__sun__) && defined(F_CLOSEFROM))
/* Use closefrom function provided by the system if it is known to be
* async-signal safe.
*
@ -1496,6 +1519,9 @@ safe_closefrom (int lowfd)
*
* OpenBSD: closefrom is not included in the list, but a direct system call
* should be safe to use.
*
* In Solaris as of 11.3 SRU 31, closefrom() is also a direct system call.
* On such systems, F_CLOSEFROM is defined.
*/
(void) closefrom (lowfd);
#elif defined(__DragonFly__)