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       umask()º¯Êý£º´Ëº¯ÊýµÄÖ÷Òª×÷ÓÃÊÇÔÚ´´½¨ÎļþʱÉèÖûòÕ߯Á±ÎµôÎļþµÄһЩȨÏÞ¡£Ò»°ãÓëopen()º¯ÊýÅäºÏʹÓá£openº¯ÊýÔ­ÐÍ£º
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
int open( const char * pathname, int flags);
int open( const char * pathname,int flags, mode_t mode);
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int main()
{
    int fd;
    umask(0026);
    fd = open("test.txt",O_RDWR | O_CREAT,0666);
    if(fd < 0)
        perror("open");
    return 0;
}
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      setsid( )˵Ã÷£º½ø³Ì´ÓËüµÄË«Ç×½ø³Ì»ñµÃËüµÄ¶Ô»°¹ý³ÌºÍ½ø³Ì×éʶ±ðºÅ¡£setsid()¾ÍÊǽ«½ø³ÌºÍËüµ±Ç°µÄ¶Ô»°¹ý³ÌºÍ½ø³Ì×é·ÖÀ뿪£¬²¢ÇÒ°ÑËüÉèÖóÉÒ»¸öеĶԻ°¹ý³ÌµÄÁìÍ·½ø³Ì¡£
pid_t pid = fork();
if (pid == 0) {
        ...
        int result = execl(path, "adb", "fork-server", "server", NULL);
} else {
        // run a program in a new session
        setsid();//֮ǰparentºÍchildÔËÐÐÔÚͬһ¸ösessionÀ¶øÇÒparentÊÇsessionÍ·£¬
        //ËùÒÔ×÷ΪsessionÍ·µÄparentÈç¹ûexit½áÊøÖ´Ðеϰ£¬ÄÇô»á»°session×éÖеÄËùÓнø³Ì½«¶¼±»É±ËÀ£»
        //ËùÒÔÖ´ÐÐsetsid()Ö®ºó£¬parent½«ÖØÐ»ñµÃÒ»¸öеĻỰsession×éid£¬child½«ÈÔ³ÖÓÐÔ­ÓеĻỰsession×飬
        //ÕâʱparentÍ˳öÖ®ºó£¬½«²»»áÓ°Ïìµ½childÁË¡£
}
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