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-rw-r--r--lib/utils_cmd.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/utils_cmd.c b/lib/utils_cmd.c
index 9e214bd..7eb9a3a 100644
--- a/lib/utils_cmd.c
+++ b/lib/utils_cmd.c
@@ -79,12 +79,14 @@ static pid_t *_cmd_pids = NULL;
79 * If that fails and the macro isn't defined, we fall back to an educated 79 * If that fails and the macro isn't defined, we fall back to an educated
80 * guess. There's no guarantee that our guess is adequate and the program 80 * guess. There's no guarantee that our guess is adequate and the program
81 * will die with SIGSEGV if it isn't and the upper boundary is breached. */ 81 * will die with SIGSEGV if it isn't and the upper boundary is breached. */
82#define DEFAULT_MAXFD 256 /* fallback value if no max open files value is set */
83#define MAXFD_LIMIT 8192 /* upper limit of open files */
82#ifdef _SC_OPEN_MAX 84#ifdef _SC_OPEN_MAX
83static long maxfd = 0; 85static long maxfd = 0;
84#elif defined(OPEN_MAX) 86#elif defined(OPEN_MAX)
85# define maxfd OPEN_MAX 87# define maxfd OPEN_MAX
86#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */ 88#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
87# define maxfd 256 89# define maxfd DEFAULT_MAXFD
88#endif 90#endif
89 91
90 92
@@ -112,10 +114,18 @@ cmd_init (void)
112 if (!maxfd && (maxfd = sysconf (_SC_OPEN_MAX)) < 0) { 114 if (!maxfd && (maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
113 /* possibly log or emit a warning here, since there's no 115 /* possibly log or emit a warning here, since there's no
114 * guarantee that our guess at maxfd will be adequate */ 116 * guarantee that our guess at maxfd will be adequate */
115 maxfd = 256; 117 maxfd = DEFAULT_MAXFD;
116 } 118 }
117#endif 119#endif
118 120
121 /* if maxfd is unnaturally high, we force it to a lower value
122 * ( e.g. on SunOS, when ulimit is set to unlimited: 2147483647 this would cause
123 * a segfault when following calloc is called ... ) */
124
125 if ( maxfd > MAXFD_LIMIT ) {
126 maxfd = MAXFD_LIMIT;
127 }
128
119 if (!_cmd_pids) 129 if (!_cmd_pids)
120 _cmd_pids = calloc (maxfd, sizeof (pid_t)); 130 _cmd_pids = calloc (maxfd, sizeof (pid_t));
121} 131}